Method: In this study the author established a three-dimensional computerized model of hip joint and tested the range of motion of three different head-neck ratio after total hip arthroplasty.

• 方法：应用计算机模拟技术建立人工全髋关节三维计算机模型，模拟测试三种不同头颈直径比全髋假体在体外不同安置方位的活动范围。