The abductor leer arm may be shortened in arthritis and other hip disorders in which part or all of the head is lost or the neck is shortened ( Figs. 7-2 , 7-3 , 7-4 , and 7-5 ).

• 在关节炎和其它髋关节病变时，股骨头部分或完全缺失或股骨颈缩短，均可致外展肌杠杆臂缩短（图7-2至7-5）。