ASYMMETRIC HIP STEM
 Inventors: Philip C. NoWe. Houston, Tex.;
Anthony K. Hedley. Paradise Valley,
Ariz.; Michael J. Schulzki. Boonton;
William J. Kelly, Jr.. Clifton, both of
 Assignee: Howmedica Inc.. New York. N.Y.
 Appl. No.: 653,295
 Filed: May 24,1996
 Int. CI.6 A61F 2/32
 U.S. CI 623/23
 Field of Search 623/18. 19, 23
 References Cited
An improved asymmetric femoral hip stem component for use in cementless hip replacement procedures is described. The stem comprises a proximal region having a novel three-dimensional configuration to allow for better fit and stability of the stem within (he femoral intramedullary canal with minimal removal of strong bone therefrom. The stem further includes a twist isolated in the mid-stem region to improve lit while minimizing enlargement of the femoral canal. A distal end comprising a rotated internal slot is also described, wherein the slot reduces bending stiffness of the stem in both the coronal and sagittal planes.
14 Claims, 12 Drawing Sheets