假体柄的颈干角

邵俊杰等在计算机模拟髋关节活动度的研究中发现，在假体柄颈干角的变化对人工关节活动范围有一定影响。在满足后伸＞40°，内收和外展各＞50°，外旋＞40°，内旋＞80°的情况下，颈干角127°股骨假体可以获得的髋关节屈曲度平均为135.64°±3.45°，颈干角131°股骨假体为126°±3.57°，颈干角135°股骨假体为118.29°±3.29°。当然，颈干角越小，偏距越大，可以提高臀中肌的张力，增加髋关节的稳定性。而高偏距假体会在张力侧承受更大的张应力，可能会造成假体或骨水泥套的疲劳断裂，也会因为偏距增加引起股骨假体在髓腔或骨水泥套内产生较高的扭转应力。随着假体材料和设计的改进，各个厂家都推出了高偏距假体，并在临床上得以广泛应用。

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