Freeman M A
Clin Orthop Relat Res. 1978 Jul-Aug(134):19-24.
The internal structure of the arthrosic and normal femoral heads are grossly different although both are roughly circular. In particular bone is destroyed or defective superolaterally in the former. The compressive strength of the femoral head depends upon the medial trabecular system which runs through the head at approximately 20 degrees to the vertical i.e. the plane of the resultant of the major loads borne by the hip. Ideally a femoral resurfacing prosthesis should be placed in this axis. The bone of the arthrosic femoral head can be sustained by blood reaching it within the neck. Thus vessels on the intracapsular surface of the neck need not be preserved.
尽管患有关节炎的股骨头和正常股骨头的内部结构大致呈圆形，但二者有明显差异。特别是，患有关节炎的股骨头在其外上侧骨质遭到破坏或存在缺损。股骨头的抗压强度取决于内侧小梁系统，该系统以大约与垂直方向呈20度的角度贯穿股骨头，即与髋关节承受的主要负荷合力的平面呈20度角。理想情况下，股骨表面置换假体应放置在这个轴线上。患有关节炎的股骨头的骨质可通过颈部进入其中的血液来维持。因此，颈部关节囊内表面的血管无需保留。
