In vitro wear testing of a contemporary design of reverse shoulder prosthesis.
In vitro wear testing of a contemporary design of reverse shoulder prosthesis.
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DOI：
10.1016/j.jbiomech.2015.07.022
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发表时间：
2015-09
影响因子：
2.4
通讯作者：
S. Smith;B. Li;A. Buniya;S. H. Lin;S. Scholes;G. Johnson;T. Joyce
中科院分区：
文献类型：
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作者：
S. Smith;B. Li;A. Buniya;S. H. Lin;S. Scholes;G. Johnson;T. Joyce
反向肩关节成形术是一种越来越常见的手术干预。然而，存在与这种关节置换相关的担忧和已知的限制，而反式肩关节假体的新颖设计继续出现在市场上。许多人声称对旧的设计进行了改进，但当人们对如何在体外测试这种植入物没有共识时，即使这种测试是必要的，这种说法也很难得到证实。为了允许适当的反式肩关节假体的体外试验，设计了一种独特的多工位试验台，该试验台能够在三个轴上施加运动以测试假体。肩关节模拟器可以在屈曲-伸展和外展-内收轴上施加高达110°的运动，在内外旋转轴上施加高达90°的运动。可提供高达1500 N的动态载荷。该模拟器由计算机控制，以便可以应用与特定日常生活活动相关的运动和负载。使用日常生活的“从杯子到嘴巴”活动，对市售反向肩关节假体进行了450万次循环磨损试验。重量分析法用于测定磨损。经过450万次“从杯到口”循环后，测试部件的平均磨损率为14.3 mm 3/百万次循环。聚乙烯试验部件显示粗糙度降低，磨损颗粒直径中值为167 nm。设计了一个三轴肩关节模拟器，并用于成功测试市售反向肩关节假体的多个样本。
Reverse shoulder arthroplasty is an increasingly common surgical intervention. However there are concerns and known limitations in relation to such joint replacement, while novel designs of reverse shoulder prostheses continue to appear on the market. Many claim to offer improvements over older designs but such assertions are difficult to validate when there is no consensus as to how such implants should be testedin vitroor even if such testing is necessary. In order to permit appropriatein vitrotesting of reverse shoulder prostheses a unique, multi-station test rig was designed which was capable of applying motion in three axes to test prostheses. The shoulder simulator can apply up to 110° of motion in the flexion–extension and abduction–adduction axes and up to 90° in the internal–external rotation axis. Dynamic loading of up to 1500 N can be provided. The simulator is computer controlled so that the motions and loading associated with particular activities of daily living can be applied. A 4.5 million cycle wear test of commercially available reverse shoulder prostheses was undertaken using a ‘mug to mouth’ activity of daily living. Gravimetric analysis was used to characterise wear. After 4.5 million cycles of ‘mug to mouth’, the average wear rate of the test components was 14.3 mm3/million cycles. Polyethylene test components showed a reduction in roughness and the median wear particle diameter was 167 nm. A three axis shoulder simulator has been designed and used to successfully test multiple samples of a commercially available reverse shoulder prosthesis.