US20010023371A1 - Bone implant and method of securing - Google Patents
Bone implant and method of securing Download PDFInfo
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- US20010023371A1 US20010023371A1 US09/815,405 US81540501A US2001023371A1 US 20010023371 A1 US20010023371 A1 US 20010023371A1 US 81540501 A US81540501 A US 81540501A US 2001023371 A1 US2001023371 A1 US 2001023371A1
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- Prior art keywords
- cement
- bone
- implant
- compartments
- engagement portion
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
- A61B17/8802—Equipment for handling bone cement or other fluid fillers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/38—Joints for elbows or knees
- A61F2/3877—Patellae or trochleae
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30617—Visible markings for adjusting, locating or measuring
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
- A61F2002/30795—Blind bores, e.g. of circular cross-section
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
- A61F2002/3082—Grooves
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- A61F2002/4631—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor the prosthesis being specially adapted for being cemented
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0058—Additional features; Implant or prostheses properties not otherwise provided for
- A61F2250/0096—Markers and sensors for detecting a position or changes of a position of an implant, e.g. RF sensors, ultrasound markers
- A61F2250/0097—Visible markings, e.g. indicia
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S623/00—Prosthesis, i.e. artificial body members, parts thereof, or aids and accessories therefor
- Y10S623/902—Method of implanting
- Y10S623/908—Bone
Definitions
- the present invention relates to an implant and to a method of securing an implant to a bone. More particularly, the present invention relates to an implant for securing to bone with bone cement, and to a method of securing an implant to a bone with bone cement.
- Implants are often secured to bone with a material such as polymethylmethacrylate (PMMA), hereinafter referred to as “bone cement” or simply “cement”.
- PMMA polymethylmethacrylate
- the cement bonds between a surface of the implant and a surface of the bone to secure the implant to the bone.
- the bone cement is applied as a slab, for example between adjoining flat surfaces of a patellar implant and a patella.
- defects in the cement such as an air bubble, an impurity or unreacted PMMA powder.
- slabs of bone cement to crack. With bone cement as with many materials a crack often initiates at the site of a defect. Or, a slab of bone cement could fail and crack from other causes such as stress or trauma. If bone cement is present in a continuous mass such as a slab, a crack propagates through the slab, resulting in complete failure of the cement system.
- compartments are formed in the face of the implant adjacent the bone, and in the face of the bone.
- the two sets of compartments are aligned to form cement cells extending between the implant and the bone when the implant is secured to the bone.
- the cement cells receive cement therein to form plugs of cement extending between the implant and the bone to secure the implant to the bone.
- the present invention is an implant for securing to a bone to form a plurality of cement cells.
- the implant has a bone engagement portion for engagement with the bone.
- the implant has surfaces defining a first plurality of cement compartments in the bone engagement portion for alignment with a second plurality of cement compartments in the bone to form a plurality of cement cells extending between the implant and the bone when the implant is secured to the bone.
- the cement cells receive cement therein to form plugs of cement extending between the implant and the bone to secure the implant to the bone.
- the implant may include one or more fill ports for supplying cement to one or more of the cement compartments.
- the implant may include means for allowing excess cement to flow from the cement compartments away from the bone engagement portion, such as exit channels extending from the cement compartments in a direction away from the bone engagement portion.
- the implant may include ridge portions around the cement compartments in the implant to block flow of cement out of the cement compartments and between the implant and the bone. There may be respective alignment markers on the bone and on the implant for aligning the cement compartments in the implant with the cement compartments in the bone.
- the bone engagement portion of the implant is preferably in abutting engagement with the bone so that there is not a continuous layer of cement between the implant and the bone across the full extent of the interface between the implant and the bone. This discontinuity in the layer of bone cement inhibits crack propagation.
- the present invention is a combination including an implant having a bone engagement portion for engagement with a bone and a first plurality of cement compartments in the bone engagement portion; a bone having a second plurality of cement compartments; the cement compartments in the implant being aligned with the cement compartments in the bone to form cement cells extending between the implant and the bone; and plugs of cement in the cement cells extending between the implant and the bone and securing the implant to the bone.
- the present invention is a method of securing an implant to bone comprising the following steps: providing an implant having a bone engagement portion for engagement with the bone and having surfaces defining a first plurality of cement compartments in the bone engagement portion; making a second plurality of cement compartments in the bone; placing the bone engagement portion of the implant adjacent the bone; aligning the cement compartments in the implant with the cement compartments in the bone to form cement cells extending between the implant and the bone; and placing cement in the cement cells to form plugs of cement extending between the implant and the bone to secure the implant to the bone.
- the method includes blocking cement from entering between the implant and the bone sufficiently to ensure that there is not a continuous layer of cement between the implant and the bone over the full extent of the interface between the implant and the bone.
- the cement compartments in the bone may be formed by drilling, broaching, or pressing into the bone.
- the cement compartments are preferably cylindrical because that shape can easily be made with a standard drill. However, other shapes are possible.
- the strength of the implant/bone interface is governed by not only the adhesive shear stress but also the pure shear stress of the plugs of bone cement.
- the interface strength is enhanced by the pure shear strength of the plugs of bone cement.
- FIG. 1 is a sectional view of an implant having three cement compartments
- FIG. 2 is a sectional view of the implant of FIG. 1 being applied to a bone having three matching cement compartments, and bone cement between;
- FIG. 3 is a view similar to FIG. 2 after the implant is moved to a position against the bone to form cement cells filled with bone cement;
- FIG. 4 is an enlarged view of one filled cement cell
- FIG. 5 is an end view of an implant like the implant of FIG. 1 but having individual fill ports for three cement compartments;
- FIG. 6 is an end view of a bone portion having three cement compartments
- FIG. 7 is a view taken along line 7 - 7 of FIG. 5;
- FIG. 8 illustrates filling of one of the cement compartments of the implant of FIGS. 5 and 7;
- FIG. 9 is a view of an implant having one fill port and one exit channel for three cement compartments
- FIG. 10 illustrates the filling of the cement compartments of the implant of FIG. 9;
- FIG. 11 is a sectional view taken along line 11 - 11 of FIG. 3 and showing areas of discontinuity in the layer of bone cement;
- FIG. 12 is a sectional view similar to FIG. 4 and showing an implant having a projecting ridge around its cement compartment to block lateral cement flow;
- FIG. 13 is a view taken along line 13 - 13 of FIG. 12.
- FIG. 14 is a view showing a rounded-bottom cement compartment in an implant.
- FIG. 1 illustrates a patellar implant 10 .
- the implant 10 is made of a body of material 12 .
- the material 12 is preferably a biocompatible plastic material.
- a preferred material is ultra high molecular weight polyethylene (UHMWPE).
- the implant 10 can be a metal backed plastic component having a bone engagement portion made of metal and an articulating surface made of plastic.
- the implant 10 has an arcuate articulating surface 20 and a planar bone engagement surface 22 .
- the surfaces 20 and 22 intersect at the outer periphery 24 of the implant 10 .
- a bone engagement portion 26 of the implant 10 includes the portion of the implant 10 adjacent to or close to the bone engagement surface 22 .
- the bone engagement portion 26 includes surfaces defining a plurality of cement compartments 30 , 32 , and 34 in the implant 10 .
- Each of the cement compartments 30 , 32 , and 34 is generally cylindrical in shape, and extends inwardly into the body of material 12 from the bone engagement surface 22 .
- the cement compartment 30 is defined by a cylindrical side wall 36 which extends between a planar end wall 38 and the plane of the bone engagement surface 22 .
- the bone engagement surface 22 is removed during formation of the cement compartment 30 at the location of the cement compartment 30 , within the boundaries of the cylindrical side wall 36 , so that cement (not shown in FIG. 1) can be placed into the cement compartment 30 in a direction from the bone engagement surface 22 toward the interior of the body of material 12 of the implant 10 .
- the cement compartments 32 and 34 are similar to the cement compartment 30 .
- the cement compartment 32 is defined by a cylindrical side wall 40 extending between a planar end wall 42 and the plane of the bone engagement surface 22 .
- the cement compartment 34 is defined by a cylindrical side wall 44 extending between a planar end wall 46 and the plane of the bone engagement surface 22 .
- the patellar implant 10 is designed to be implanted on a resected patella (kneecap) 50 shown fragmentarily in FIG. 2.
- the patella 50 is resected to provide a planar implant engagement surface 52 for mating with the bone engagement surface 22 of the implant 10 .
- a plurality of cement compartments 54 , 56 , and 58 are formed in the patella 50 .
- the cement compartments 54 , 56 , and 58 are similar in size and shape to the cement compartments 30 , 32 , and 34 in the implant 10 .
- the cement compartments 54 , 56 , and 58 in the patella 50 are located in the patella 50 so as to be aligned with the respective cement compartments 30 , 32 , and 34 in the implant 10 when the implant 10 is placed adjacent the patella 50 .
- a quantity of bone cement 60 is placed between the implant and the patella.
- the implant 10 and the patella 50 are then moved toward each other in the direction indicated by the arrows 62 and 64 (FIG. 2).
- the quantity of bone cement 60 may be placed on the implant engagement surface 52 of the patella 50 , with the implant 10 being then moved in the direction indicated by the arrow 62 into engagement with the bone cement.
- the bone cement 60 may be placed on the bone engagement surface 22 of the implant 10 , and the implant and bone cement then moved in the direction indicated by the arrow 62 into engagement with the bone 50 .
- There may, of course, be movement of the patella 50 in the direction indicated by the arrow 64 to join the patella with the implant 10 ; such movement may be limited by the soft tissue attachment of the patella to the patient's knee joint.
- Some cement 60 may be placed on the implant 10 and the remainder of the cement placed on the patella 50 , with the implant and patella then being pressed or squeezed toward each other.
- the bone engagement surface 22 of the implant is spaced from the implant engagement surface 52 of the bone, with the bone cement 60 disposed therebetween.
- a portion 70 of the bone cement 60 is disposed in the cement compartment 30 in the implant 10 .
- a portion 72 of the bone cement 60 is disposed in the cement compartment 54 in the bone 50 , which is aligned with the cement compartment 30 .
- a portion 76 of the bone cement 60 is disposed in the cement compartment 32 of the implant 10 .
- a portion 78 of the bone cement 60 is disposed in the cement compartment 56 of the bone 50 , which is aligned with the cement compartment 32 .
- a portion 80 of the bone cement 60 is disposed in the cement compartment 34 in the implant 10 .
- a portion 82 of the bone cement 60 is disposed in the cement compartment 58 , which is aligned with the cement compartment 34 .
- the implant 10 and the bone 50 are in the relative position shown in FIG. 2, there is some bone cement disposed between the bone engagement surface 22 of the implant and the implant engagement surface 52 of the bone.
- a portion 84 of the bone cement 60 is disposed between the bone engagement surface 22 and the bone 50 and extends outwardly from the aligned cement compartments 30 and 54 .
- Another portion 86 of the bone cement 60 extends between the aligned compartments 30 and 54 and the aligned cement compartments 32 and 56 .
- a further portion 88 of the bone cement 60 is disposed between the aligned cement compartments 32 and 56 and the aligned cement compartments 34 and 58 .
- Another portion 90 of the bone cement 60 extends outwardly from the aligned cement compartments 80 and 82 toward the outer edge 24 of the implant 10 .
- the implant 10 is pressed or squeezed firmly against the bone 50 as shown in FIG. 3 to remove as much bone cement as possible from between the bone engagement surface 22 of the implant and the implant engagement surface 52 of the bone.
- the amount of excess bone cement 60 that is the bone cement which is not disposed within the various cement compartments when the implant 10 and the bone 50 are adjacent each other as in FIG. 3, depends on the amount of cement initially placed between the implant and the bone, and its location. Ideally, all the cement flows into the aligned cement compartments, but of course this may not be possible.
- the cement compartment 30 in the implant is aligned with the cement compartment 54 in the bone to form a cement cell 100 .
- the cement cell 100 extends between the implant 10 and the bone 50 .
- Disposed within the cement cell 100 is a plug or pin of cement 102 which includes the cement portion 70 in the cement compartment 30 of the implant 10 and the cement portion 70 in the cement compartment 54 of the bone 50 .
- the cement cell 100 extends between the implant 10 and the bone 50 across the interface 104 between the implant and the bone—that is, across the area of engagement between the implant and the bone.
- a very thin layer 106 of bone cement 60 may be disposed between the bone engagement surface 22 of the implant 10 and the implant engagement surface 52 of the bone 50 . This can be for several reasons. First, it may not be possible to provide matching planar surfaces on the implant 10 and on the bone 50 so as to allow complete contact of the two elements at all locations. Second, the implant 10 and bone 50 may be pressed toward each other unevenly, with more pressure at some locations and less at other locations. In any event, it is desirable that there not be a continuous layer of bone cement 60 between the implant 10 and the bone 50 for the entire extent of the interface between the implant and the bone. Thus, as seen in FIG. 11, areas of discontinuity of the bone cement are preferably present, to block propagation of any cracks throughout the entire interface. Any bone cement which squeezes out to the other edge 24 of the implant, as indicated at 108 and 110 in FIG. 3, is cleaned off.
- the cement plugs make it possible to put the implant directly against the bone. This allows for minimizing the areas of continuity of bone cement between the implant and the bone. This minimizes the likelihood of propagation of a crack in the bone cement and minimizes the chance of failure of the cement system.
- the plugs or pins of cement provide additional stability to secure the implant 10 to the bone 50 .
- the maximum force such as torque, which can be transferred through the cement between the implant and the bone, is related to the adhesive interfacial shear stress between the cement and the implant.
- the strength of the implant/bone interface is governed by not only the adhesive shear stress but also the pure shear stress of the plugs or pins or cylinders of bone cement in the cement cells.
- the cement pins must fail in shear. This requires substantially more stress than that needed to cause failure of the slab.
- Bone cement may be placed in the cement cells in a manner other than as described above.
- the implant 120 (FIGS. 5, 7 and 8 ) has three cement compartments 122 , 124 , and 126 which are similar in size, shape and location to the cement compartments 30 , 32 and 34 of the implant 10 (FIGS. 1 - 4 ). However, the cement compartments in the implant 120 are fillable through fill ports extending between the respective cement compartments and the radially outer edge 128 of the implant 120 .
- a first fill port 130 (FIG. 5) is defined by a partial cylindrical surface 132 extending radially outwardly from the cement compartment 122 to the implant periphery 128 .
- a second fill port 134 extends radially between the cement compartment 124 and the periphery 128 and is partially defined by a partial cylindrical surface 136 .
- a third fill port 138 partially defined by a partial cylindrical surface 140 , extends radially between the cement compartment 126 and the implant periphery 128 .
- the bone engagement portion 142 is the lower portion (as viewed in FIG. 7) of the implant 120 .
- the implant 120 also has an arcuate articulating surface 144 and a generally planar bone engagement surface 146 .
- the implant 120 has a circular shape in plan.
- the cement compartments 122 , 124 , and 126 are spaced equally about a central axis 150 of the implant 120 .
- the cement compartments 122 , 124 , and 126 are designed to mate with matching cement compartments 154 , 156 , and 158 in a bone 160 (FIG. 6) having an implant engagement surface 162 .
- the implant 120 (FIG. 5) has two alignment markers 170 and 172 .
- the alignment marker 170 is a notch 174 cut into the periphery 128 of the implant 120 and defined by two side lines 176 and 178 .
- the alignment marker 172 is a notch 180 cut into the periphery 128 of the implant 120 and defined by two side lines 182 and 184 .
- a template (not shown) is used to place alignment markers 186 and 188 (FIG. 6) on the bone 160 , preferably at the same time as the cement compartments 154 , 156 , and 158 are made.
- the alignment marker 186 is a notch 190 defined by two side lines 192 and 194 scribed into the implant engagement surface 162 of the bone 160 .
- the alignment marker 188 is a V-shaped notch 196 defined by two side lines 198 and 200 scribed into the implant engagement surface 162 of the bone 60 .
- the implant 120 in FIG. 5 is aligned with or placed on the bone 160 in FIG. 6 by rotating or mirroring the implant 120 about an imaginary line extending vertically on the sheet of drawings between FIGS. 5 and 6.
- the alignment marker 172 is placed on and in alignment with the alignment marker 186 .
- the alignment marker 170 of the implant 120 is placed on and in alignment with the alignment marker 188 on the bone 160 .
- the cement compartment 124 of the implant 120 is aligned with the cement compartment 154 on the bone 160 .
- the cement compartments 122 and 126 of the implant 120 are aligned with, respectively, cement compartments 158 and 156 of the bone 160 .
- the cement compartment 122 in the implant 120 aligns with the cement compartment 154 in bone 160 to form a cement cell 164 .
- the cement compartment 126 in the implant 120 aligns with the cement compartment 156 in the bone 160 to form a second cement cell 166 .
- the cement compartment 124 in the implant 120 aligns with the cement compartment 158 in the bone 160 to form a third cement cell 168 .
- the cement cells 164 , 166 , and 168 are filled with bone cement in a manner as described below to secure the implant to the bone.
- the cement cell 164 is filled through the fill port 130 .
- the cement cell 166 is filled through the fill port 138 (FIG. 5) for the cement compartment 126 .
- the cement cell 168 is filled through the fill port 134 .
- a device is used to introduce cement into the cement cells of the aligned implant 120 and bone 160 .
- the device may be a syringe 210 having a needle 212 which is inserted into the fill port 134 , for example.
- Bone cement (not shown) is injected through the syringe 210 and the needle 212 to fill the cement cell 168 . Excess bone cement will be present in the fill port 134 .
- the cement cell 164 is filled through the fill port 130
- the cement cell 166 is filled through the fill port 138 (FIG. 5).
- FIGS. 9 and 10 illustrate another embodiment of the invention in which an implant 230 has three cement compartments 232 , 234 , and 236 which are all filled via one fill port 238 .
- the fill port 238 includes a straight portion 240 extending from the outer periphery 242 of the implant 230 to a first arcuate fill port portion 242 .
- the first arcuate fill port portion 232 extends between and interconnects the cement compartments 234 and 236 .
- a second arcuate fill port portion 244 extends between and interconnects the cement compartment 236 and the cement compartment 232 .
- a third arcuate fill port portion 246 extends between and interconnects the cement compartment 234 and the cement compartment 232 .
- An exit channel 250 extends from the portion 244 of the fill port 238 to the outer periphery 242 of the implant 230 , at a location diametrically opposite from the fill port portion 240 .
- the implant 230 has a bone engagement portion 252 , a bone engagement surface 254 , and an articulating surface 256 .
- FIG. 10 illustrates the securing of the implant 230 to a bone 260 .
- the bone 260 has an implant engagement surface 262 which is placed in mating engagement with the bone engagement surface 254 of the implant 230 .
- the implant 230 is aligned with the bone 260 so that the cement compartment 232 aligns with a cement compartment 264 in the bone 260 to form a cement cell 266 extending between the implant 230 and the bone 260 .
- the cement compartment 236 in the implant 230 aligns with a cement compartment 268 in the bone 260 to form a cement cell 270 extending between the implant and the bone.
- the cement compartment 234 in the implant 230 aligns with a cement compartment 272 in the bone 260 to form a cement cell 274 extending between the implant and the bone.
- the cement cells 266 , 270 and 274 are filled by insertion of bone cement 275 through a device such as a syringe 276 (FIG. 10) having a needle 278 .
- the needle 278 is placed in the fill port portion 240 and bone cement 275 is injected into the fill port portion 240 .
- bone cement 275 continuous to be injected, it flows through the remaining portions 242 , 244 and 246 of the fill port 238 .
- the cement cells 266 , 270 and 274 fill with bone cement 275 . Excess cement 275 flows outwardly from the fill port 238 through the exit channel 250 and may be cleaned off the outer surface 256 of the implant 230 .
- FIG. 11 illustrates how the present invention can minimize the possibility of there being a continuous layer of bone cement across the entire extent of the interface between an implant and a bone.
- the cement cell 100 (FIGS. 3 and 11) is filled with a plug or pin of bone cement 102 .
- the cement compartments 34 and 58 (FIG. 3) form a cement cell 280 (FIGS. 3 and 11) filled with a plug of cement 282 .
- the cement compartments 32 and 56 (FIG. 3) form a cement cell 284 (FIGS. 3 and 11) filled with a plug of bone cement 286 .
- the plugs of bone cement 102 , 282 , and 286 are discrete and separate from each other.
- An implant in accordance with the present invention may include ridge portions around cement compartments in the implant to block flow of cement out of the cement compartment between the implant and the bone.
- One such ridge portion is illustrated schematically in FIGS. 12 and 13.
- An implant 300 is disposed in mating engagement with a bone portion 302 .
- the implant 300 has a bone engagement surface 304 disposed adjacent an implant engagement surface 306 of the bone portion 302 .
- a cement compartment 308 in the implant 300 is aligned with a cement compartment 310 in the bone portion 302 .
- the plug of bone cement 314 extends between the implant 300 and the bone portion 302 .
- the plug of bone cement 314 extends into the implant 300 for a substantial distance in a direction away from the interface or area of engagement 316 between the implant 300 and the bone portion 302 .
- the plug of cement 314 also extends into the bone portion 302 in a direction away from the interface 316 , the bone engagement surface 304 and the implant engagement surface 306 .
- the implant 300 has a ridge portion 320 extending around the cement compartment 308 .
- the ridge portion 320 has an outer cylindrical surface 322 extending outwardly from the implant bone engagement surface 304 ; an annular end face 324 extending radially inwardly from the surface 322 ; and an inner cylindrical surface 326 extending parallel to the outer cylindrical surface 322 from the annular end face 324 to the plane of the bone engagement surface 304 .
- the implant ridge portion 320 extends into the bone portion 302 , below the implant engagement surface 306 , as illustrated in FIG. 12, when the implant 300 is positioned adjacent the bone portion 302 .
- the ridge portion 320 blocks the flow of cement out of the cement cell 312 into the areas 328 and 330 adjacent the cement cell and between the implant 300 and the bone 302 .
- the ridge portion 320 is pressed into the bone portion 302 , below the implant engagement surface 306 , when the implant 300 is positioned adjacent the bone 302 .
- Ridge portions may also be provided on fill ports.
- FIG. 14 illustrates a cement compartment 340 in an implant 342 .
- the cement compartment 340 has a rounded bottom portion 344 to reduce stress concentrations in the plug of bone cement and/or in the implant itself.
- the cement compartment 340 has a tapered side wall 346 and an arcuate entrance edge 348 .
- the round cross-sectional shape of the illustrated cement compartments is a result of the drilling process used to form them. Other shapes could be used as suitable and feasible.
- one embodiment of the invention is in a patellar implant.
- Typical outer diameters of patellar implants would be 32 mm, 35 mm, and 38 mm to fit different size patients.
- the height of the implant would be between 6 mm and 8 mm.
- Compartment diameters currently being considered are under 10 mm, with a preferred range being between 6 mm and 8 mm.
- the compartments have a height of 1, 2, or 3 mm in each of the implant and the bone.
- the cement cells have a height of 2 mm, 4 mm, or 6 mm.
- the fill ports are preferably 3 mm to 5 mm in diameter with a height of 2 mm to 3 mm.
- the angular placement of the compartments and of the fill ports depend on the number of each.
- the fill ports could be spaced equally along an imaginary circle as illustrated in the drawings. Alternatively, there could be a large number of smaller compartments spread over the surface, as on the surface of a golf ball.
- the presently preferred implant design includes 3 cement compartments with a height of 2 mm and a diameter of 7-8 mm, providing cement cells with a height of 4 mm. Fill ports are not used.
- the implant is solid UHMWPE with a maximum thickness of 6-8 mm and an outer diameter of 32, 35, or 38 mm depending on the bone size. Alignment is made by two small notches 90
Abstract
Description
- 1. Technical Field
- The present invention relates to an implant and to a method of securing an implant to a bone. More particularly, the present invention relates to an implant for securing to bone with bone cement, and to a method of securing an implant to a bone with bone cement.
- 2. Description of the Prior Art
- Implants are often secured to bone with a material such as polymethylmethacrylate (PMMA), hereinafter referred to as “bone cement” or simply “cement”. The cement bonds between a surface of the implant and a surface of the bone to secure the implant to the bone.
- Often the bone cement is applied as a slab, for example between adjoining flat surfaces of a patellar implant and a patella. There may be defects in the cement such as an air bubble, an impurity or unreacted PMMA powder. It is known for slabs of bone cement to crack. With bone cement as with many materials a crack often initiates at the site of a defect. Or, a slab of bone cement could fail and crack from other causes such as stress or trauma. If bone cement is present in a continuous mass such as a slab, a crack propagates through the slab, resulting in complete failure of the cement system.
- Another concern with bone cement is the maximum force (such as torque) which can be transferred, through the cement, between the implant and the bone. In the case of a slab, the maximum torque is related to the adhesive interfacial shear stress between the cement and the implant.
- It is desirable to be able to minimize propagation through the bone cement of any cracks which may unavoidably occur. To this end, in accordance with the present invention, compartments are formed in the face of the implant adjacent the bone, and in the face of the bone. The two sets of compartments are aligned to form cement cells extending between the implant and the bone when the implant is secured to the bone. The cement cells receive cement therein to form plugs of cement extending between the implant and the bone to secure the implant to the bone.
- In one embodiment the present invention is an implant for securing to a bone to form a plurality of cement cells. The implant has a bone engagement portion for engagement with the bone. The implant has surfaces defining a first plurality of cement compartments in the bone engagement portion for alignment with a second plurality of cement compartments in the bone to form a plurality of cement cells extending between the implant and the bone when the implant is secured to the bone. The cement cells receive cement therein to form plugs of cement extending between the implant and the bone to secure the implant to the bone.
- The implant may include one or more fill ports for supplying cement to one or more of the cement compartments. The implant may include means for allowing excess cement to flow from the cement compartments away from the bone engagement portion, such as exit channels extending from the cement compartments in a direction away from the bone engagement portion. The implant may include ridge portions around the cement compartments in the implant to block flow of cement out of the cement compartments and between the implant and the bone. There may be respective alignment markers on the bone and on the implant for aligning the cement compartments in the implant with the cement compartments in the bone.
- The bone engagement portion of the implant is preferably in abutting engagement with the bone so that there is not a continuous layer of cement between the implant and the bone across the full extent of the interface between the implant and the bone. This discontinuity in the layer of bone cement inhibits crack propagation.
- In another embodiment, the present invention is a combination including an implant having a bone engagement portion for engagement with a bone and a first plurality of cement compartments in the bone engagement portion; a bone having a second plurality of cement compartments; the cement compartments in the implant being aligned with the cement compartments in the bone to form cement cells extending between the implant and the bone; and plugs of cement in the cement cells extending between the implant and the bone and securing the implant to the bone.
- In another embodiment, the present invention is a method of securing an implant to bone comprising the following steps: providing an implant having a bone engagement portion for engagement with the bone and having surfaces defining a first plurality of cement compartments in the bone engagement portion; making a second plurality of cement compartments in the bone; placing the bone engagement portion of the implant adjacent the bone; aligning the cement compartments in the implant with the cement compartments in the bone to form cement cells extending between the implant and the bone; and placing cement in the cement cells to form plugs of cement extending between the implant and the bone to secure the implant to the bone. Preferably, the method includes blocking cement from entering between the implant and the bone sufficiently to ensure that there is not a continuous layer of cement between the implant and the bone over the full extent of the interface between the implant and the bone.
- The cement compartments in the bone may be formed by drilling, broaching, or pressing into the bone. The cement compartments are preferably cylindrical because that shape can easily be made with a standard drill. However, other shapes are possible.
- With a compartmentalized system, the strength of the implant/bone interface is governed by not only the adhesive shear stress but also the pure shear stress of the plugs of bone cement. The interface strength is enhanced by the pure shear strength of the plugs of bone cement. For an aligned compartment system to fail in shear the cement plugs must fail in shear which requires substantially more stress than that needed to cause failure of a slab.
- The foregoing and other features of the present invention will become apparent to one skilled in the art to which the present invention relates upon consideration of the following description of the invention with reference to the accompanying drawings, wherein:
- FIG. 1 is a sectional view of an implant having three cement compartments;
- FIG. 2 is a sectional view of the implant of FIG. 1 being applied to a bone having three matching cement compartments, and bone cement between;
- FIG. 3 is a view similar to FIG. 2 after the implant is moved to a position against the bone to form cement cells filled with bone cement;
- FIG. 4 is an enlarged view of one filled cement cell;
- FIG. 5 is an end view of an implant like the implant of FIG. 1 but having individual fill ports for three cement compartments;
- FIG. 6 is an end view of a bone portion having three cement compartments;
- FIG. 7 is a view taken along line7-7 of FIG. 5;
- FIG. 8 illustrates filling of one of the cement compartments of the implant of FIGS. 5 and 7;
- FIG. 9 is a view of an implant having one fill port and one exit channel for three cement compartments;
- FIG. 10 illustrates the filling of the cement compartments of the implant of FIG. 9;
- FIG. 11 is a sectional view taken along line11-11 of FIG. 3 and showing areas of discontinuity in the layer of bone cement;
- FIG. 12 is a sectional view similar to FIG. 4 and showing an implant having a projecting ridge around its cement compartment to block lateral cement flow;
- FIG. 13 is a view taken along line13-13 of FIG. 12; and
- FIG. 14 is a view showing a rounded-bottom cement compartment in an implant.
- The present invention relates to an implant and to a method of securing an implant to a bone with bone cement. The present invention is applicable to various implant constructions. As representative of the present invention, FIG. 1 illustrates a
patellar implant 10. Theimplant 10 is made of a body ofmaterial 12. Thematerial 12 is preferably a biocompatible plastic material. A preferred material is ultra high molecular weight polyethylene (UHMWPE). Alternatively, theimplant 10 can be a metal backed plastic component having a bone engagement portion made of metal and an articulating surface made of plastic. - The
implant 10 has an arcuate articulatingsurface 20 and a planarbone engagement surface 22. Thesurfaces outer periphery 24 of theimplant 10. - A
bone engagement portion 26 of theimplant 10 includes the portion of theimplant 10 adjacent to or close to thebone engagement surface 22. Thebone engagement portion 26 includes surfaces defining a plurality of cement compartments 30, 32, and 34 in theimplant 10. - Each of the cement compartments30, 32, and 34 is generally cylindrical in shape, and extends inwardly into the body of
material 12 from thebone engagement surface 22. Thecement compartment 30 is defined by acylindrical side wall 36 which extends between aplanar end wall 38 and the plane of thebone engagement surface 22. Thebone engagement surface 22 is removed during formation of thecement compartment 30 at the location of thecement compartment 30, within the boundaries of thecylindrical side wall 36, so that cement (not shown in FIG. 1) can be placed into thecement compartment 30 in a direction from thebone engagement surface 22 toward the interior of the body ofmaterial 12 of theimplant 10. - The cement compartments32 and 34 are similar to the
cement compartment 30. Thecement compartment 32 is defined by acylindrical side wall 40 extending between aplanar end wall 42 and the plane of thebone engagement surface 22. Thecement compartment 34 is defined by acylindrical side wall 44 extending between aplanar end wall 46 and the plane of thebone engagement surface 22. - The
patellar implant 10 is designed to be implanted on a resected patella (kneecap) 50 shown fragmentarily in FIG. 2. Thepatella 50 is resected to provide a planarimplant engagement surface 52 for mating with thebone engagement surface 22 of theimplant 10. - In preparation for implanting the
implant 10 on thepatella 50, a plurality of cement compartments 54, 56, and 58 are formed in thepatella 50. The cement compartments 54, 56, and 58 are similar in size and shape to the cement compartments 30, 32, and 34 in theimplant 10. Further, the cement compartments 54, 56, and 58 in thepatella 50 are located in thepatella 50 so as to be aligned with the respective cement compartments 30, 32, and 34 in theimplant 10 when theimplant 10 is placed adjacent thepatella 50. For example, there may be provided three cement compartments in an implant as shown in FIG. 5, for alignment with three cement compartments in a bone shown in FIG. 6. - To secure the implant10 (FIG. 2) to the
patella 50, a quantity ofbone cement 60 is placed between the implant and the patella. Theimplant 10 and thepatella 50 are then moved toward each other in the direction indicated by thearrows 62 and 64 (FIG. 2). - The quantity of
bone cement 60 may be placed on theimplant engagement surface 52 of thepatella 50, with theimplant 10 being then moved in the direction indicated by thearrow 62 into engagement with the bone cement. Alternatively, thebone cement 60 may be placed on thebone engagement surface 22 of theimplant 10, and the implant and bone cement then moved in the direction indicated by thearrow 62 into engagement with thebone 50. There may, of course, be movement of thepatella 50 in the direction indicated by thearrow 64 to join the patella with theimplant 10; such movement may be limited by the soft tissue attachment of the patella to the patient's knee joint. Somecement 60 may be placed on theimplant 10 and the remainder of the cement placed on thepatella 50, with the implant and patella then being pressed or squeezed toward each other. - When the
implant 10 and thebone 50 are in the position shown in FIG. 2, thebone engagement surface 22 of the implant is spaced from theimplant engagement surface 52 of the bone, with thebone cement 60 disposed therebetween. Aportion 70 of thebone cement 60 is disposed in thecement compartment 30 in theimplant 10. Aportion 72 of thebone cement 60 is disposed in thecement compartment 54 in thebone 50, which is aligned with thecement compartment 30. Aportion 76 of thebone cement 60 is disposed in thecement compartment 32 of theimplant 10. A portion 78 of thebone cement 60 is disposed in thecement compartment 56 of thebone 50, which is aligned with thecement compartment 32. Aportion 80 of thebone cement 60 is disposed in thecement compartment 34 in theimplant 10. Aportion 82 of thebone cement 60 is disposed in thecement compartment 58, which is aligned with thecement compartment 34. - When the
implant 10 and thebone 50 are in the relative position shown in FIG. 2, there is some bone cement disposed between thebone engagement surface 22 of the implant and theimplant engagement surface 52 of the bone. Aportion 84 of thebone cement 60 is disposed between thebone engagement surface 22 and thebone 50 and extends outwardly from the aligned cement compartments 30 and 54. Anotherportion 86 of thebone cement 60 extends between the aligned compartments 30 and 54 and the aligned cement compartments 32 and 56. Afurther portion 88 of thebone cement 60 is disposed between the aligned cement compartments 32 and 56 and the aligned cement compartments 34 and 58. Anotherportion 90 of thebone cement 60 extends outwardly from the aligned cement compartments 80 and 82 toward theouter edge 24 of theimplant 10. - The
implant 10 is pressed or squeezed firmly against thebone 50 as shown in FIG. 3 to remove as much bone cement as possible from between thebone engagement surface 22 of the implant and theimplant engagement surface 52 of the bone. The amount ofexcess bone cement 60, that is the bone cement which is not disposed within the various cement compartments when theimplant 10 and thebone 50 are adjacent each other as in FIG. 3, depends on the amount of cement initially placed between the implant and the bone, and its location. Ideally, all the cement flows into the aligned cement compartments, but of course this may not be possible. - When the
implant 10 is adjacent thebone 50, thecement compartment 30 in the implant is aligned with thecement compartment 54 in the bone to form acement cell 100. Thecement cell 100 extends between theimplant 10 and thebone 50. Disposed within the cement cell 100 (FIG. 4) is a plug or pin ofcement 102 which includes thecement portion 70 in thecement compartment 30 of theimplant 10 and thecement portion 70 in thecement compartment 54 of thebone 50. Thecement cell 100 extends between theimplant 10 and thebone 50 across theinterface 104 between the implant and the bone—that is, across the area of engagement between the implant and the bone. - A very
thin layer 106 ofbone cement 60 may be disposed between thebone engagement surface 22 of theimplant 10 and theimplant engagement surface 52 of thebone 50. This can be for several reasons. First, it may not be possible to provide matching planar surfaces on theimplant 10 and on thebone 50 so as to allow complete contact of the two elements at all locations. Second, theimplant 10 andbone 50 may be pressed toward each other unevenly, with more pressure at some locations and less at other locations. In any event, it is desirable that there not be a continuous layer ofbone cement 60 between theimplant 10 and thebone 50 for the entire extent of the interface between the implant and the bone. Thus, as seen in FIG. 11, areas of discontinuity of the bone cement are preferably present, to block propagation of any cracks throughout the entire interface. Any bone cement which squeezes out to theother edge 24 of the implant, as indicated at 108 and 110 in FIG. 3, is cleaned off. - With the prior art method of using a slab of cement between the implant and the bone, it was necessary to hold the implant away from the bone by at least some distance. With the present invention, the cement plugs make it possible to put the implant directly against the bone. This allows for minimizing the areas of continuity of bone cement between the implant and the bone. This minimizes the likelihood of propagation of a crack in the bone cement and minimizes the chance of failure of the cement system.
- The plugs or pins of cement, such as the
cement plug 102 in thecement cell 100, provide additional stability to secure theimplant 10 to thebone 50. In the case of a slab of cement only between an implant and a bone, the maximum force, such as torque, which can be transferred through the cement between the implant and the bone, is related to the adhesive interfacial shear stress between the cement and the implant. With a compartmentalized system, as illustrated in the drawings, the strength of the implant/bone interface is governed by not only the adhesive shear stress but also the pure shear stress of the plugs or pins or cylinders of bone cement in the cement cells. For a system using aligned compartments, as illustrated, to fail in shear, the cement pins must fail in shear. This requires substantially more stress than that needed to cause failure of the slab. - Bone cement may be placed in the cement cells in a manner other than as described above. The implant120 (FIGS. 5, 7 and 8) has three
cement compartments implant 120 are fillable through fill ports extending between the respective cement compartments and the radiallyouter edge 128 of theimplant 120. - A first fill port130 (FIG. 5) is defined by a partial
cylindrical surface 132 extending radially outwardly from thecement compartment 122 to theimplant periphery 128. Asecond fill port 134 extends radially between thecement compartment 124 and theperiphery 128 and is partially defined by a partialcylindrical surface 136. Athird fill port 138, partially defined by a partialcylindrical surface 140, extends radially between thecement compartment 126 and theimplant periphery 128. - The cement compartments122, 124, and 126, with their
respective fill ports bone engagement portion 142 of theimplant 120. Thebone engagement portion 142 is the lower portion (as viewed in FIG. 7) of theimplant 120. Theimplant 120 also has an arcuate articulatingsurface 144 and a generally planarbone engagement surface 146. - As can be seen in FIG. 5, the
implant 120 has a circular shape in plan. The cement compartments 122, 124, and 126 are spaced equally about acentral axis 150 of theimplant 120. The cement compartments 122, 124, and 126 are designed to mate with matchingcement compartments implant engagement surface 162. - To aid in alignment of the cement compartments in the
implant 120 with the cement compartments in thebone 160, one or more alignment markers may be provided on either the implant or the bone or both. The implant 120 (FIG. 5) has twoalignment markers alignment marker 170 is anotch 174 cut into theperiphery 128 of theimplant 120 and defined by twoside lines alignment marker 172 is anotch 180 cut into theperiphery 128 of theimplant 120 and defined by twoside lines - A template (not shown) is used to place
alignment markers 186 and 188 (FIG. 6) on thebone 160, preferably at the same time as the cement compartments 154, 156, and 158 are made. Thealignment marker 186 is anotch 190 defined by twoside lines implant engagement surface 162 of thebone 160. Thealignment marker 188 is a V-shapednotch 196 defined by twoside lines implant engagement surface 162 of thebone 60. - The
implant 120 in FIG. 5 is aligned with or placed on thebone 160 in FIG. 6 by rotating or mirroring theimplant 120 about an imaginary line extending vertically on the sheet of drawings between FIGS. 5 and 6. Thealignment marker 172 is placed on and in alignment with thealignment marker 186. Thealignment marker 170 of theimplant 120 is placed on and in alignment with thealignment marker 188 on thebone 160. - When this is done, the
cement compartment 124 of theimplant 120 is aligned with thecement compartment 154 on thebone 160. Similarly, the cement compartments 122 and 126 of theimplant 120 are aligned with, respectively, cement compartments 158 and 156 of thebone 160. Thecement compartment 122 in theimplant 120 aligns with thecement compartment 154 inbone 160 to form acement cell 164. Thecement compartment 126 in theimplant 120 aligns with thecement compartment 156 in thebone 160 to form asecond cement cell 166. Thecement compartment 124 in theimplant 120 aligns with thecement compartment 158 in thebone 160 to form athird cement cell 168. - After the
implant 120 is aligned with the bone 160 (FIG. 8), thecement cells cement cell 164 is filled through thefill port 130. Thecement cell 166 is filled through the fill port 138 (FIG. 5) for thecement compartment 126. Thecement cell 168 is filled through thefill port 134. - As illustrated schematically in FIG. 8, a device is used to introduce cement into the cement cells of the aligned
implant 120 andbone 160. The device may be asyringe 210 having aneedle 212 which is inserted into thefill port 134, for example. Bone cement (not shown) is injected through thesyringe 210 and theneedle 212 to fill thecement cell 168. Excess bone cement will be present in thefill port 134. Similarly, thecement cell 164 is filled through thefill port 130, and thecement cell 166 is filled through the fill port 138 (FIG. 5). - When the
cement cells bone engagement portion 142 of theimplant 10. Thus, there is not a continuous layer of bone cement across the interface between theimplant 120 and thebone 160. Rather, there are discrete, separated bone cement portions securing theimplant 120 to thebone 160. These bone cement portions include plugs of cement in thecement cells implant 120 and thebone 160, away from thebone engagement surface 146 and theimplant engagement surface 162. These cement plugs block lateral movement of theimplant 120 relative to thebone 160 in a manner superior to the blocking effect obtained by a simple slab of bone cement between the implant and the bone, as is done in the prior art. - FIGS. 9 and 10 illustrate another embodiment of the invention in which an
implant 230 has threecement compartments fill port 238. Thefill port 238 includes astraight portion 240 extending from theouter periphery 242 of theimplant 230 to a first arcuatefill port portion 242. The first arcuatefill port portion 232 extends between and interconnects the cement compartments 234 and 236. A second arcuatefill port portion 244 extends between and interconnects thecement compartment 236 and thecement compartment 232. A third arcuatefill port portion 246 extends between and interconnects thecement compartment 234 and thecement compartment 232. Anexit channel 250 extends from theportion 244 of thefill port 238 to theouter periphery 242 of theimplant 230, at a location diametrically opposite from thefill port portion 240. Theimplant 230 has abone engagement portion 252, abone engagement surface 254, and an articulatingsurface 256. - FIG. 10 illustrates the securing of the
implant 230 to abone 260. Thebone 260 has animplant engagement surface 262 which is placed in mating engagement with thebone engagement surface 254 of theimplant 230. Theimplant 230 is aligned with thebone 260 so that thecement compartment 232 aligns with acement compartment 264 in thebone 260 to form a cement cell 266 extending between theimplant 230 and thebone 260. Thecement compartment 236 in theimplant 230 aligns with acement compartment 268 in thebone 260 to form acement cell 270 extending between the implant and the bone. Thecement compartment 234 in theimplant 230 aligns with acement compartment 272 in thebone 260 to form acement cell 274 extending between the implant and the bone. - The
cement cells bone cement 275 through a device such as a syringe 276 (FIG. 10) having aneedle 278. Theneedle 278 is placed in thefill port portion 240 andbone cement 275 is injected into thefill port portion 240. Asbone cement 275 continuous to be injected, it flows through the remainingportions fill port 238. Thecement cells bone cement 275.Excess cement 275 flows outwardly from thefill port 238 through theexit channel 250 and may be cleaned off theouter surface 256 of theimplant 230. - FIG. 11 illustrates how the present invention can minimize the possibility of there being a continuous layer of bone cement across the entire extent of the interface between an implant and a bone. The cement cell100 (FIGS. 3 and 11) is filled with a plug or pin of
bone cement 102. Similarly, the cement compartments 34 and 58 (FIG. 3) form a cement cell 280 (FIGS. 3 and 11) filled with a plug ofcement 282. The cement compartments 32 and 56 (FIG. 3) form a cement cell 284 (FIGS. 3 and 11) filled with a plug ofbone cement 286. The plugs ofbone cement bone cement bone engagement surface 22 of theimplant 10 and theimplant engagement surface 52 of thebone 50, such as the areas of bone cement indicated schematically at 288, 290 and 292 in FIG. 11. However, these areas of bone cement again do not form one continuous body of bone cement across the extent of the interface between theimplant 10 and thebone 50. Thus, any crack which might originate in any one of the bodies of bone cement are not likely to propagate across the entire extent of the interface between theimplant 10 and thebone 50. - An implant in accordance with the present invention may include ridge portions around cement compartments in the implant to block flow of cement out of the cement compartment between the implant and the bone. One such ridge portion is illustrated schematically in FIGS. 12 and 13. An
implant 300 is disposed in mating engagement with abone portion 302. Theimplant 300 has abone engagement surface 304 disposed adjacent animplant engagement surface 306 of thebone portion 302. Acement compartment 308 in theimplant 300 is aligned with acement compartment 310 in thebone portion 302. - The aligned cement compartments308 and 310 together define a
cement cell 312 having a quantity ofbone cement 314 therein. The plug ofbone cement 314 extends between theimplant 300 and thebone portion 302. The plug ofbone cement 314 extends into theimplant 300 for a substantial distance in a direction away from the interface or area ofengagement 316 between theimplant 300 and thebone portion 302. The plug ofcement 314 also extends into thebone portion 302 in a direction away from theinterface 316, thebone engagement surface 304 and theimplant engagement surface 306. - The
implant 300 has aridge portion 320 extending around thecement compartment 308. Theridge portion 320 has an outercylindrical surface 322 extending outwardly from the implantbone engagement surface 304; anannular end face 324 extending radially inwardly from thesurface 322; and an innercylindrical surface 326 extending parallel to the outercylindrical surface 322 from theannular end face 324 to the plane of thebone engagement surface 304. Theimplant ridge portion 320 extends into thebone portion 302, below theimplant engagement surface 306, as illustrated in FIG. 12, when theimplant 300 is positioned adjacent thebone portion 302. Theridge portion 320 blocks the flow of cement out of thecement cell 312 into theareas implant 300 and thebone 302. Theridge portion 320 is pressed into thebone portion 302, below theimplant engagement surface 306, when theimplant 300 is positioned adjacent thebone 302. Ridge portions may also be provided on fill ports. - The cement cells and the cement compartments need not have a cylindrical configuration as illustrated above. FIG. 14 illustrates a cement compartment340 in an
implant 342. The cement compartment 340 has a roundedbottom portion 344 to reduce stress concentrations in the plug of bone cement and/or in the implant itself. Also, the cement compartment 340 has a taperedside wall 346 and anarcuate entrance edge 348. The round cross-sectional shape of the illustrated cement compartments is a result of the drilling process used to form them. Other shapes could be used as suitable and feasible. - As discussed, one embodiment of the invention is in a patellar implant. Typical outer diameters of patellar implants would be 32 mm, 35 mm, and 38 mm to fit different size patients. The height of the implant would be between 6 mm and 8 mm.
- Compartment diameters currently being considered are under 10 mm, with a preferred range being between 6 mm and 8 mm. The compartments have a height of 1, 2, or 3 mm in each of the implant and the bone. Thus, the cement cells have a height of 2 mm, 4 mm, or 6 mm. The fill ports are preferably 3 mm to 5 mm in diameter with a height of 2 mm to 3 mm.
- The angular placement of the compartments and of the fill ports depend on the number of each. The fill ports could be spaced equally along an imaginary circle as illustrated in the drawings. Alternatively, there could be a large number of smaller compartments spread over the surface, as on the surface of a golf ball.
- The presently preferred implant design includes3 cement compartments with a height of 2 mm and a diameter of 7-8 mm, providing cement cells with a height of 4 mm. Fill ports are not used. The implant is solid UHMWPE with a maximum thickness of 6-8 mm and an outer diameter of 32, 35, or 38 mm depending on the bone size. Alignment is made by two
small notches 90| apart on the implant and on the bone. - From the above description of the invention, those skilled in the art will perceive improvements, changes and modifications in the invention. Such improvements, changes and modifications within the skill of the art are intended to be covered by the appended claims.
Claims (22)
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US09/815,405 US20010023371A1 (en) | 1993-04-12 | 2001-03-22 | Bone implant and method of securing |
US09/941,185 US6702821B2 (en) | 2000-01-14 | 2001-08-28 | Instrumentation for minimally invasive joint replacement and methods for using same |
US09/976,396 US6770078B2 (en) | 2000-01-14 | 2001-10-11 | Movable knee implant and methods therefor |
US10/795,887 US7959635B1 (en) | 2000-01-14 | 2004-03-08 | Limited incision total joint replacement methods |
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US08/735,916 US6217617B1 (en) | 1993-04-12 | 1996-10-24 | Bone implant and method of securing |
US09/815,405 US20010023371A1 (en) | 1993-04-12 | 2001-03-22 | Bone implant and method of securing |
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US09/789,621 Continuation-In-Part US6635073B2 (en) | 2000-01-14 | 2001-02-21 | Method of securing body tissue |
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US09/941,185 Continuation-In-Part US6702821B2 (en) | 2000-01-14 | 2001-08-28 | Instrumentation for minimally invasive joint replacement and methods for using same |
US09/976,396 Continuation-In-Part US6770078B2 (en) | 2000-01-14 | 2001-10-11 | Movable knee implant and methods therefor |
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US08/735,916 Expired - Lifetime US6217617B1 (en) | 1993-04-12 | 1996-10-24 | Bone implant and method of securing |
US09/815,405 Abandoned US20010023371A1 (en) | 1993-04-12 | 2001-03-22 | Bone implant and method of securing |
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US08/377,759 Expired - Lifetime US5624462A (en) | 1993-04-12 | 1995-01-24 | Bone implant and method of securing |
US08/735,916 Expired - Lifetime US6217617B1 (en) | 1993-04-12 | 1996-10-24 | Bone implant and method of securing |
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US8727203B2 (en) | 2010-09-16 | 2014-05-20 | Howmedica Osteonics Corp. | Methods for manufacturing porous orthopaedic implants |
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US8814902B2 (en) | 2000-05-03 | 2014-08-26 | Bonutti Skeletal Innovations Llc | Method of securing body tissue |
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Also Published As
Publication number | Publication date |
---|---|
US5624462A (en) | 1997-04-29 |
US6217617B1 (en) | 2001-04-17 |
US5441538A (en) | 1995-08-15 |
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