Impingement and loosening of the long posterior wall acetabular implant.
Impingement and loosening of the long posterior wall acetabular implant.
复制标题
长后壁髋臼植入物的撞击和松动。
DOI：
10.1302/0301-620x.74b3.1587881
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
D. Murray
中科院分区：
文献类型：
--
作者：
D. Murray
长后壁Charnley髋臼植入物被广泛使用，因为人们认为长后壁有助于防止脱位。然而，这还没有得到统计上的证实。在翻修时移除这些植入物的初步研究中，经常看到明显的LPW侵蚀，表明可能发生重复撞击。因此，用数学方法研究了长后壁的影响。如果标准套接字比LPW套接字前倾5度，则发现LPW和标准套接字同样可能脱臼。通过模拟外部旋转，LPW插座比标准插座撞击时间早30%。当撞击发生时，对构件施加扭矩，从而增加水泥-骨界面处的剪切应力。扭矩，虽然没有大到足以立即使套筒脱臼，但是重复的，因此可能导致松动。LPW套筒产生的扭矩是标准套筒的两倍，因此更容易松动。
Long posterior wall (LPW) Charnley acetabular implants are widely used as it is believed that the LPW helps to prevent dislocation. This has, however, not been proven statistically. In a preliminary study of these implants removed at revision marked erosion of the LPW was frequently seen, indicating that repetitive impingement may occur. The influence of the long posterior wall was therefore investigated mathematically. LPW and standard sockets were found to be equally likely to dislocate provided that the standard socket was anteverted 5 degrees more than the LPW socket. With simulated external rotation, LPW sockets impinge 30% earlier than standard sockets. When impingement occurs a torque is applied to the components, which increases the shear stresses at the cement-bone interface. The torques, although not large enough to dislodge the socket immediately, are repetitive and so may contribute to loosening. The LPW socket can generate twice as much torque as the standard socket and therefore is more likely to loosen.