The summation of forces on extensor mechanism should be zero according to equilibrium rules of forces before and after t计算得到髌骨形位参数变化前后与伸膝机构相关的动力学参数，包括股四头肌力、髌韧带力及髌股关节接触压力的变化。
One stage reimplantation for the salvage of total knee arthroplasty complicated by infection人工全膝关节置换术后深部感染的一期假体再置换