Cho Myung-Rae, Choi Won Kee, Kim Jae Jung
Department of Orthopaedic Surgery, Daegu Catholic University College of Medicine, Daegu, Korea.
Hip Pelvis. 2016 Sep;28(3):134-141. doi: 10.5371/hp.2016.28.3.134. Epub 2016 Sep 30.
Instability and dislocation after total hip arthroplasty are the most common causes of revisions and major complications for failure of inserted prostheses, leading to a reduction in quality of life. Because the use of artificial femoral head sizes smaller than patient's own size is the important cause for dislocation, the use of large femoral head have increased. Femoral head sizes greater than 32 mm offer multiple advantages in physical function and activity levels of patients by improving hip stability, decreasing dislocation rate and increasing range of motion. However, various concerns are encountered including wear debris generation at the trunnion-bore interface and increases in frictional torque and stress over the component-bone interface when using larger head sizes. So, the use of femoral head sizes less than 40 mm is recommended.
全髋关节置换术后的不稳定和脱位是假体植入失败进行翻修和出现严重并发症的最常见原因，会导致生活质量下降。由于使用小于患者自身尺寸的人工股骨头是脱位的重要原因，因此大尺寸股骨头的使用有所增加。大于32毫米的股骨头尺寸通过提高髋关节稳定性、降低脱位率和增加活动范围，在患者的身体功能和活动水平方面具有多种优势。然而，使用较大尺寸的股骨头时会遇到各种问题，包括在耳轴-孔界面产生磨损碎屑以及部件-骨界面的摩擦扭矩和应力增加。因此，建议使用小于40毫米的股骨头尺寸。
