DE3516743A1 - Endoprosthesis for a femoral head - Google Patents

Endoprosthesis for a femoral head

Info

Publication number
DE3516743A1
DE3516743A1 DE19853516743 DE3516743A DE3516743A1 DE 3516743 A1 DE3516743 A1 DE 3516743A1 DE 19853516743 DE19853516743 DE 19853516743 DE 3516743 A DE3516743 A DE 3516743A DE 3516743 A1 DE3516743 A1 DE 3516743A1
Authority
DE
Germany
Prior art keywords
endoprosthesis
femoral head
prosthesis section
prosthesis
section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
DE19853516743
Other languages
German (de)
Inventor
Klaus Dieter 2000 Hamburg Schelhas
Hans-Walter 5102 Würselen Staudte
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ORTHOPLANT ENDOPROTHETIK
ORTHOPLANT ENDOPROTHETIK GmbH
Original Assignee
ORTHOPLANT ENDOPROTHETIK
ORTHOPLANT ENDOPROTHETIK GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ORTHOPLANT ENDOPROTHETIK, ORTHOPLANT ENDOPROTHETIK GmbH filed Critical ORTHOPLANT ENDOPROTHETIK
Priority to DE19853516743 priority Critical patent/DE3516743A1/en
Publication of DE3516743A1 publication Critical patent/DE3516743A1/en
Ceased legal-status Critical Current

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/32Joints for the hip
    • A61F2/36Femoral heads ; Femoral endoprostheses
    • A61F2/3601Femoral heads ; Femoral endoprostheses for replacing only the epiphyseal or metaphyseal parts of the femur, e.g. endoprosthetic femoral heads or necks directly fixed to the natural femur by internal fixation devices
    • A61F2/3603Femoral heads ; Femoral endoprostheses for replacing only the epiphyseal or metaphyseal parts of the femur, e.g. endoprosthetic femoral heads or necks directly fixed to the natural femur by internal fixation devices implanted without ablation of the whole natural femoral head
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30756Cartilage endoprostheses
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316The 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
    • A61F2002/30329Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30476Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
    • A61F2002/30507Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism using a threaded locking member, e.g. a locking screw or a set screw
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30767Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30767Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30879Ribs
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/46Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2002/4631Special 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
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2220/00Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements

Abstract

There is specified an endoprosthesis for a femoral head which possesses a prosthetic section for fixing in a corresponding recess in the human femoral head. The prosthetic section is designed as a strip-shaped runner whose outer surface is spherically bent in a manner corresponding to the femoral head, and forms a partial substitute for damaged osseous tissue.

Description

Beschreibung description

Die Erfindung betrifft eine Endoprothese für einen Hüftkopf, mit einem Prothesenabschnitt, der auf dem entsprechend abgefrästen natürlichen Hüftkopf mit Verankerungselementen und/oder unter Zugabe von Knochenzement befestigbar ist.The invention relates to an endoprosthesis for a femoral head, with a Prosthesis section, which is on the correspondingly milled natural femoral head with Anchoring elements and / or can be fastened with the addition of bone cement.

Eine derartige Endoprothese für einen menschlichen Hüftkopf ist z.B. aus der DE-PS 30 06 178 bekannt, bei welcher der Prothesenabschnitt aus einer rotationssymmetrischen, eine kugel- oder kalottenförmige Aussenfläche aufweisende Kappe besteht. An der Kappe ist ein Schaft befestigt, der koaxial zur Rotationssymmetrieachse verläuft und als eine Hülse mit ausgebrochenen Löchern ausgebildet ist. Der hülsenartige, durchbrochene Schaft soll das Verwachsen mit dem Knochen erleichtern und die Endoprothese drehfest als auch axial unverschiebbar mit dem Knochen verbinden. Nachteilig ist jedoch, dass bei Verwendung dieser bekannten Endoprothese der Hüftkopf des Femurs über seine ganze Oberflache abgefräst werden muss, damit die als Halbkugel-Schale ausgebildete Kappe auf den verbleibenden Knochen zapfen aufgesetzt werden kann und diesen allseitig umgibt.Such an endoprosthesis for a human femoral head is e.g. from DE-PS 30 06 178 known, in which the prosthesis section consists of a rotationally symmetrical, consists of a spherical or dome-shaped outer surface having a cap. At the A shaft is attached to the cap, which is coaxial with the axis of rotational symmetry and is designed as a sleeve with broken holes. The pod-like, The openwork shaft is intended to facilitate fusing with the bone and the endoprosthesis non-rotatably as well as axially immovable with the bone. Is disadvantageous However, when using this known endoprosthesis, the femoral head of the femur must be milled off over its entire surface so that it is a hemispherical shell trained cap can be placed on the remaining bone and pin surrounds this on all sides.

In vielen Fällen, in denen der llüftkopf beschädigt ist und mit einer Prothese versehen werden muss, sind jedoch Teilbereiche der Kopffläche vollständig gesund, oft ist nur eine spezielle Zone der Kopffläche, zumeist die obere Hauptdruckfläche, beschädigt. Bei der bekannten Hüftkopf-Endoprothese wird in diesen Fällen jedoch die gesamte Kopffläche, d.h.In many cases where the air head is damaged and with a Prosthesis must be provided, however, partial areas of the head surface are complete healthy, often there is only a special zone of the head surface, mostly the upper main pressure area, damaged. In the known femoral head endoprosthesis in these However, cases the entire head area, i.

zu einem Grossteil vollständig gesundes Knochengewebe, abgetragen. Dadurch wird die Stabilität des natürlichen Hüftkopfes unnötig geschwächt, die natürliche Knochenregeneration an der Kopffläche wird gestört, die relativ grosse Grenzfläche zwischen Endoprothese und Knochenzapfen birgt erhöhte Infektionsgefahr in sich.largely completely healthy bone tissue removed. As a result, the stability of the natural femoral head is unnecessarily weakened, the natural one Bone regeneration on the head surface is disturbed, the relatively large interface between the endoprosthesis and the bone plug carries an increased risk of infection.

Aufgabe der Erfindung ist es demgegenüber, eine Endoprothese der eingangs genannten Art anzugeben, bei deren Verwendung möglichst wenig Knochenmaterial entfernt werden muss.The object of the invention, on the other hand, is to provide an endoprosthesis of the initially mentioned Specify the named species, which removes as little bone material as possible when used must become.

Diese Aufgabe wird erfindungsgemäss dadurch gelöst, dass der Prothesenabschnitt als streifenförmige Kufe ausgebildet ist, deren Aussenfläche dem Hüftkopf entsprechend sphärisch gekrümmt ist.According to the invention, this object is achieved in that the prosthesis section is designed as a strip-shaped runner, the outer surface of which corresponds to the femoral head is spherically curved.

Mit der erfindungsgemässen Endoprothese ist es möglich, einen Teilersatz der Kopffläche des Hüftkopfes dort vorzunehmen, wo die Kopffläche beschädigt ist. Zu diesem Zweck wird der beschädigte Knochenbereich lediglich in einem der Form des Prothesenabschnitts entsprechenden Umfang abgefräst, während die angrenzenden gesunden Teile der Kopffläche vollständig erhalten bleiben. Der Prothesenabschnitt ist dabei bündig an die angrenzende gesunde Kopffläche einzupassen, und da der Prothesenabschnitt sphärisch mit dem Radius des natürlichen Hüftkopfes gekrümmt ist, ist eine genaue Anpassung an die natürlichen Gegebenheiten gewährleistet. Die Festigkeit des natürlichen Hüftkopfes wird nur wenig verringert, und die Endoprothese ist - aufgrund ihrer reduzierten Fläche - einer geringeren Beanspruchung ausgesetzt als bei einer bekannten Halbkugel-Schalenprothese, weil nämlich die ausserhalb des Prothesenabschnitts eingeleiteten Kräfte den Prothesen/ Knochenverbund auch gar nicht belasten. Darüber hinaus ist die Blutversorgung und die Ernährung des Hüftkopfes bei dem erfindungsgemässen Teilersatz ungleich besser als beim Aufsetzen einer Halbkugel-Schale.With the endoprosthesis according to the invention it is possible to have a partial replacement the head surface of the femoral head where the head surface is damaged. For this purpose, the damaged bone area is only in one of the molds of the prosthesis section milled off the corresponding circumference, while the adjacent healthy parts of the head surface are completely preserved. The prosthetic section must be fitted flush with the adjacent healthy head surface, and there the prosthesis section spherically curved with the radius of the natural femoral head is an accurate one Adjustment to the natural conditions guaranteed. The strength of the natural The femoral head is only slightly reduced, and the endoprosthesis is - due to it reduced Surface - exposed to less stress than with a known hemispherical shell prosthesis, because the forces introduced outside the prosthesis section affect the prosthesis / Also do not put any strain on the bone joint. In addition, the blood supply and the nutrition of the femoral head with the partial replacement according to the invention is much better than when putting on a hemispherical bowl.

Die erfindungsgemässe Endoprothese Iässt sich entweder zementfrei mit geeigneten Verankerungselementen, z.B. bekannten Dübeln oder Schäften oder Schrauben, verbinden. Alternativ ist es auch möglich, den Prothesenabschnitt mittels Knochenzement auf dem entsprechend abgefrästen Hüftkopf zu befestigen.The endoprosthesis according to the invention can either be cement-free with suitable anchoring elements, e.g. known dowels or shafts or screws, associate. Alternatively, it is also possible to use bone cement to fill the prosthesis section to be attached to the correspondingly milled femoral head.

Besonders bevorzugt ist der streifenförmige Prothesenabschnitt als Ausschnitt einer Halbkugel-Schale ausgebildet und besitzt im wesentlichen eine gleichbleibende Wandstärke. In diesem Fall muss die entsprechende Ausfräsung im Hüftkopf einen stufenförmigen Rand aufweisen, damit der bündige Übergang zwischen Prothesenabschnitt und gesunder Fläche gewährleistet ist. Alternativ kann der Prothesenabschnitt so ausgebildet sein, dass seine Wandstärke zum Rand hin kontinuierlich auf einen sehr geringen Wert abnimmt. Die Ausfräsung im Hüftkopf kann dann einen allmählichen Randübergang aufweisen.The strip-shaped prosthesis section is particularly preferred as Section of a hemispherical shell formed and has essentially a constant Wall thickness. In this case, the corresponding cutout in the femoral head must be step-shaped Have edge, so that the flush transition between the prosthesis section and healthy Area is guaranteed. Alternatively, the prosthesis section can be designed in this way be that its wall thickness towards the edge continuously to a very low Value decreases. The milling in the femoral head can then have a gradual edge transition exhibit.

Besonders bevorzugt nimmt die laterale Ausdehnung des streifenförmigen Prothesenabschnitts zu seinem ventralen und dorsalen Ende hin steti#g ab. Bei dieser Formgebung ist der zentrale Bereich des Prothesenabschnitts - lateral - am breitesten und nimmt dann zum ventralen und dorsalen Ende hin in seiner Breite ab, und ist an den bciden Enden der streifenförmigen Kufe abgerundet. Ein derartig geformter Prothesenabschnitt ist besonders geeignet, um den üblicherweise beschädigten Bereich der Kopffläche, der vom oberen Kopfscheitel ventral und dorsal nach unten verläuft, ersetzen zu können.The lateral extent of the strip-shaped is particularly preferred Prosthesis section steadily down towards its ventral and dorsal end. At this Shaping the central area of the prosthesis section - lateral - is the widest and takes then decreases in width towards the ventral and dorsal ends, and is at the bciden Rounded ends of the strip-shaped runner. Such a shaped prosthesis section is particularly suitable for the usually damaged area of the head surface, which runs from the top of the head ventrally and dorsally downwards, replace to can.

Der Prothesenabschnitt kann als zementfreie Endoprothese ausgebildet sein, er besitzt dann geeignete Verankerungselemente, z.B. einen auf der Innenfläche ansetzenden Verankerungsschaft. Bevorzugt lässt sich die Innenfläche auch mit einer Noppen- oder Hinterschnittstruktur versehen, die ein festes Einwachsen der sich nachbildenden Spongiosa in die Zwischenräume oder Hinterschnitte ermöglicht und dadurch dem Prothesen/Knochenverbund die endgültige Festigkeit verleiht. Alternativ lässt sich der Prothesen abschnitt auch unter Verwendung von Knochenzement einzementieren.The prosthesis section can be designed as a cement-free endoprosthesis it then has suitable anchoring elements, e.g. one on the inner surface attaching anchoring shaft. The inner surface can preferably also be equipped with a Nub or undercut structure provided that a firm ingrowth of the reproducing cancellous bone in the interstices or undercuts and allows this gives the prosthesis / bone bond its final strength. Alternatively the prosthesis section can also be cemented using bone cement.

Die Endoprothese besteht bevorzugt aus Metall, wie z.B. Titan oder einer Chrom-Vanadium-Legierung. Sie lässt sich jedoch alternativ auch aus Keramikmaterial herstellen.The endoprosthesis is preferably made of metal, such as titanium or a chrome-vanadium alloy. Alternatively, however, it can also be made of ceramic material produce.

Vorteilhafte Weiterbildungen der Erfindung sind durch die Merkmale der Unteransprüche gekennzeichnet.Advantageous further developments of the invention are provided by the features of the subclaims.

Im folgenden werden Ausführungsbeispiele der Erfindung anhand der Zeichnung näher erläutert.In the following, embodiments of the invention are based on the Drawing explained in more detail.

Es zeigen: Fig. 1 eine perspektivische Ansicht einer ersten Ausführungsform der erfindungsgemässen Endoprothese; Fig. 2 eine perspektivische Ansicht einer zweiten Ausführungsform der Endoprothese; und Fig. 3 eine dritte Ausführungsform der Endoprothese in implantiertem Zustand.1 shows a perspective view of a first embodiment the endoprosthesis according to the invention; Fig. 2 is a perspective view of a second Embodiment of the endoprosthesis; and FIG. 3 shows a third embodiment of the endoprosthesis in the implanted state.

Die Fig. 1 zeigt eine perspektivische Ansicht einer erfindungsgemässen Endoprothese. Ein Prothesenabschnitt 2, der in eine entsprechende Einfräsung auf der Oberfläche eines menschlichen Hüftkopfes einsetzbar und dort z.B. mittels Knochenzement befestigbar ist, besitzt die Gestalt einer streifenförmigen Kufe. Die Aussenfläche 4 des Prothesenabschnitts 2 ist entsprechend dem Hüftkopf, in welchen der Prothesenabschnitt eingesetzt wird, kugelförmig gekrümmt, wobei der Krümmungsradius dem Radius des natürlichen Hüftkopfes entspricht. Der Prothesenabschnitt besitzt ein ventrales Ende 8 und ein dorsales Ende 10, die beide abgerundet sind. Der Prothesenabschnitt 2 besitzt über seine gesamte Fläche im wesentlichen eine konstante Dicke, der Rand 5 kann abgerundet oder kantig ausgebildet sein. Die zum Knochen gerichtete Innenfläche 6 des Prothesenabschnitts 2 ist aufgerauht, so dass der Knochenzement, welcher beim Befestigen der Endoprothese gemäss Fig. 1 zu verwenden ist, einen festen Verbund mit dem Prothesenabschnitt 2 eingeht.Fig. 1 shows a perspective view of an inventive Endoprosthesis. A prosthesis section 2, which is milled into a corresponding recess can be used on the surface of a human femoral head and there e.g. by means of bone cement can be fastened, has the shape of a strip-shaped runner. The outside area 4 of the prosthesis section 2 corresponds to the femoral head in which the prosthesis section is used, spherically curved, the radius of curvature being the radius of the corresponds to the natural femoral head. The prosthesis section has a ventral one End 8 and a dorsal end 10, both of which are rounded. The prosthetic section 2 has an essentially constant thickness over its entire surface, the edge 5 can be rounded or angular. The inner surface facing the bone 6 of the prosthesis section 2 is roughened so that the bone cement which is used in the Attaching the endoprosthesis according to FIG. 1 is to be used, a solid bond enters with the prosthesis section 2.

Die Endoprothese gemäss Fig. 2 entspricht in ihrem Aufbau der Endoprothese gemäss Fig. 1, sie besitzt ebenfalls einen Prothesenabschnitt 2 in Gestalt einer streifenförmigen Kufe, deren Aussenfläche 4 kugelförmig gekrümmt ist, d.h. der Prothesenabschnitt 2 lässt sich als Teil einer Halbkugel-Schale herstellen. Am ventralen Ende 8 und am dorsalen Ende 10 ist der Prothesenabschnitt 2 abgerundet. Die Innenfläche 6 des Prothesenabschnitts 2 ist mit einer Noppen- oder Hinterschnittstruktur versehen, in welche die angrenzende Spongiosa des angefrästen Kopfabschnitts hineinwachsen soll. An die Innenfläche 6 des Prothesenabschnitts ist zentral ein Verankerungsschaft 12 angebracht, der zur Rotationssicherung mit axialen Ansätzen 14 versehen sein kann.The structure of the endoprosthesis according to FIG. 2 corresponds to that of the endoprosthesis according to FIG. 1, it also has a prosthesis section 2 in the form of a strip-shaped runner, the outer surface 4 of which is spherically curved, i.e. the prosthesis section 2 can be produced as part of a hemispherical shell. At the ventral end 8 and At the dorsal end 10, the prosthesis section 2 is rounded. The inner surface 6 of the Prosthesis section 2 is provided with a nub or undercut structure, into which the adjacent cancellous bone of the milled head section grows target. An anchoring shaft is centrally located on the inner surface 6 of the prosthesis section 12 attached, which can be provided with axial lugs 14 to prevent rotation can.

Zusätzlich besitzt der Prothesenabschnitt 2 z.B. an seinem ventralen Ende 8 eine Bohrung 16 zum Anbringen einer Schraube od.dgl., um die Prothese zusätzlich zu befestigen und gegen Rotation zu sichern.In addition, the prosthesis section has 2 on its ventral one, for example End 8 a hole 16 for attaching a screw or the like. To the prosthesis in addition to fasten and to secure against rotation.

In Fig. 3 ist eine erfindungsgemässe Endoprothese im implantierten Zustand dargestellt. Der Hüftkopf 20 des Femurs besitzt eine flache Ausnehmung 22, die sich - in der dargestellten Ausführungsform -über den zentralen Druckbereich der Kopffläche ventral nach unten und entsprechend dorsal nach unten erstreckt. In die Ausnehmung 22 ist ein kufenförmiger Prothesenabschnitt 2, dessen Aussenfläche 4 der Kugelkrümmung des Hüftkopfes angepasst ist, bündig eingesetzt und im Knochen befestigt oder verankert. Die um den Prothesenabschnitt 2 herumlaufende Fuge lässt sich nach dem Einsetzen der Endoprothese z.B. mit Knochenzement verschliessen.In Fig. 3 an endoprosthesis according to the invention is implanted State shown. The femoral head 20 of the femur has a shallow recess 22, which - in the embodiment shown - over the central pressure area the head surface ventrally downwards and correspondingly dorsally downwards. In the recess 22 is a runner-shaped prosthesis section 2, its outer surface 4 is adapted to the spherical curvature of the femoral head, inserted flush and in the bone attached or anchored. The joint running around the prosthesis section 2 leaves close after the endoprosthesis has been inserted, e.g. with bone cement.

Auf diese Weise bildet die erfindungsgemässe Endoprothese einen Teilersatz des Hüftkopfes.In this way, the endoprosthesis according to the invention forms a partial replacement of the femoral head.

Claims (9)

Endoprothese für einen Hüftkopf Ansprüche 1. Endoprothese für einen Hüftkopf, mit einem Prothesenabschnitt, der auf dem entsprechend abgefrästen natürlichen Hüftkopf mit Verankerungselementen und/ oder unter Zugabe von Knochenzement befestigbar ist, dadurch gekennzeichnet, dass der Prothesenabschnitt (2) als streifenförmige Kufe ausgebildet ist, deren Aussenfläche (4) dem Hüftkopf entsprechend sphärisch gekrümmt ist.Endoprosthesis for a femoral head claims 1. Endoprosthesis for a Femoral head, with a prosthesis section, which is on the correspondingly milled natural Femoral head can be fixed with anchoring elements and / or with the addition of bone cement is, characterized in that the prosthesis section (2) as a strip-shaped Skid is formed, the outer surface (4) of the femoral head correspondingly spherical is curved. 2. Endoprothese nach Anspruch 1, dadurch gekennzeichnet, dass der Prothesenabschnitt (2) ein streifenförmiger Teil einer Halbkugel-Schale ist.2. Endoprosthesis according to claim 1, characterized in that the Prosthesis section (2) is a strip-shaped part of a hemispherical shell. 3. Endoprothese nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Prothesenabschnitt (2) eine gleichbleibende Wandstärke besitzt.3. Endoprosthesis according to claim 1 or 2, characterized in that the prosthesis section (2) has a constant wall thickness. 4. Endoprothese nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Wandstärke des Prothesenabschnitts (2) zum Rand (5) hin abnimmt.4. Endoprosthesis according to one of the preceding claims, characterized in that that the wall thickness of the prosthesis section (2) decreases towards the edge (5). 5. Endoprothese nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die laterale Ausdehnung des streifenförmigen Prothesenabschnitts (2) zu seinem ventralen und dorsalen Ende hin abnimmt.5. Endoprosthesis according to one of the preceding claims, characterized in that that the lateral extension of the strip-shaped prosthesis section (2) to his decreases towards the ventral and dorsal ends. 6. Endoprothese nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Prothesenabschnitt (2) an seinem dorsalen und ventralen Ende (8, 10) abgerundet ist.6. Endoprosthesis according to one of the preceding claims, characterized in that that the prosthesis section (2) is rounded at its dorsal and ventral ends (8, 10) is. 7. Endoprothese nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Innenfläche (6) des Prothesenabschnitts (2) eine Noppen-oder Hinterschnittstruktur besitzt.7. Endoprosthesis according to one of the preceding claims, characterized in that that the inner surface (6) of the prosthesis section (2) has a nub or undercut structure owns. 8. Endoprothese nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Prothesenabschnitt (2) aus gegossenem Metall besteht.8. Endoprosthesis according to one of the preceding claims, characterized in that that the prosthesis section (2) consists of cast metal. 9. Endoprothese nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass der Prothesenabschnitt (2) aus Keramik besteht.9. Endoprosthesis according to one of claims 1 to 7, characterized in that that the prosthesis section (2) consists of ceramic.
DE19853516743 1985-05-09 1985-05-09 Endoprosthesis for a femoral head Ceased DE3516743A1 (en)

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