| 摘要 |
A prosthesis (21) for implantation in a bone (F) includes a collar (25) having a first surface (27) and a second surface (29) generally on an opposite side of the collar (25) for engaging the bone (F) and transferring forces to the bone (F). A neck (33) extends outwardly from the first surface (27) and is adapted to receive a ball (35) thereon. A stem (37) extends outwardly from the second surface (29) of the collar (25) for reception in the bone (F). The second surface (29) is shaped to promote force transmitting engagement of the second surface (29) with the bone (F) over at least a substantial portion of the second surface (29), to limit engagement of the second surface (29) with the bone (F) at an area of stress concentration in the second surface (29), and to inhibit line contact between the second surface (29) and bone (F). |
