Swanson S A
Clin Orthop Relat Res. 1978 Jul-Aug(134):12-8.
The diameter of the femoral neck ought not to be reduced, and to provide sufficient ranges of motion without impingement requires the largest practicable articular surface radius and perhaps a less than hemispherical acetabular articular surface. Wear is less with plastic cups and metallic balls than vice versa, and wearing life requires some minimum acetabular wall thickness, which depends on the diameter of the articular surface. Fixation grooves etc. should not reduce the effective wall thickness in highly-stressed regions. In practice, a nearly hemispherical acetabular component will often protrude medially or (preferably) laterally; such a protrusion is unlikely to weaken the fixation but could cause impingement, and could be removed with no loss. The available volume is best used by having the thickest acetabular wall where the wear should be greatest. For the femoral component, the simplest internal surface, a flat-ended cylinder, is also the best. A part-spherical inner surface cannot easily be filled with cement, and a skirt surrounding part or all of the femoral neck offers no advantages and some disadvantages.
股骨颈的直径不应减小，要提供足够的活动范围且不发生撞击，需要尽可能大的可行关节面半径，髋臼关节面可能小于半球形。塑料杯和金属球的磨损比相反情况要小，磨损寿命需要一定的最小髋臼壁厚度，这取决于关节面的直径。固定槽等不应减小高应力区域的有效壁厚。在实际应用中，接近半球形的髋臼部件通常会向内侧或（最好是）外侧突出；这种突出不太可能削弱固定，但可能会导致撞击，而且去除后不会有损失。通过在磨损最大的地方设置最厚的髋臼壁，可以最好地利用可用空间。对于股骨部件，最简单的内表面，即平端圆柱体，也是最好的。部分球形内表面不容易填充骨水泥，围绕部分或全部股骨颈的裙边没有优势且有一些劣势。
