| 摘要 |
<p>An osteoprosthesis component comprises a head portion with a generally spherical head having a smooth articulating surface, to be received in a socket to form an articulating joint, and a stem portion to be received in the medullary canal of a bone, with an obtuse angle between the axes of the stem portion and the head portion. A part of the articulating surface of the head is provided by a segment of a sphere defined by a plane substantially perpendicular to the axis of the head portion between the articulating surface and the equator of the sphere, the articulating surface of the head including a lip which extends beyond the segment-defining plane, the lip being arranged on that part of the circumference of the head portion facing generally away from the stem portion.</p> |
