Mjöberg B, Hansson L I, Selvik G
Acta Orthop Scand. 1984 Oct;55(5):504-6. doi: 10.3109/17453678408992946.
Roentgen stereophotogrammetric analysis (RSA) has been carried out on 24 total hip prostheses (24 patients), which were all painful at weightbearing. The examinations were made with the hip at distraction, compression, external and internal rotation. One acetabular component showed instability only at distraction-compression and one showed instability only at rotation. Four femoral components showed instability at distraction-compression and at rotation, six only at rotation, but none showed instability only at distraction-compression. Thus rotational provocation demonstrated instability in all unstable femoral components; rotational stress must be of importance in mechanical loosening of the femoral component.
对24个全髋关节假体（24例患者）进行了X线立体摄影测量分析（RSA），这些假体在负重时均疼痛。检查在髋关节处于牵引、压缩、外旋和内旋状态下进行。一个髋臼部件仅在牵引 - 压缩时显示不稳定，一个仅在旋转时显示不稳定。四个股骨部件在牵引 - 压缩和旋转时显示不稳定，六个仅在旋转时显示不稳定，但没有一个仅在牵引 - 压缩时显示不稳定。因此，旋转激发试验显示所有不稳定的股骨部件均存在不稳定；旋转应力在股骨部件的机械性松动中一定起重要作用。
