Leer arm A-B may be shorter than normal in arthritic hip.Centralization of head shortens leer arm B-X, and lateral reattachment of trochanter lengthens leer arm A-B.

• 在炎性病变的髋关节A-B可能比正常情况短，股骨头中心化可缩短B-X，而将大粗隆外移重固定可加长A-B。