定量评估髋臼磨损测量中的清除率和蠕变量。
Quantification of clearance and creep in acetabular wear measurements.
机构信息
1 Accelerate Innovation Management, Geneva, Switzerland ; 2 Department of Orthopaedic Surgery, Hôpital Européen Georges Pompidou, University René Descartes, Faculty of Medicine, Paris, France ; 3 Department of Mechanical Engineering, Imperial College London, London, UK.
出版信息
Ann Transl Med. 2016 Apr;4(7):131. doi: 10.21037/atm.2016.03.39.
BACKGROUND
This study aimed to measure femoral head penetration before occurrence of real wear, and to quantify the portions attributable respectively to clearance and plastic deformations in various acetabular designs.
METHODS
We analyzed CT scans from 15 patients at 'day five' after total hip arthroplasty (THA). All patients received Exafit(®) femoral stems and 28 mm heads: 5 patients had cemented Durasul(®) all-PE cups, 5 patients had un-cemented Allofit(®) metal-backed cups, and 5 patients had un-cemented Stafit(®) dual-mobility cups. We also analyzed CT scans of samples of the three head-cup combinations to compare in vivo and in vitro measurements.
RESULTS
The mean femoral head penetration measured on 'day five' was lower for all-PE cups (0.196 mm) than for metal-backed cups (0.551 mm) and dual-mobility cups (0.634 mm).
CONCLUSIONS
The present study indicates that isolated measurements of femoral head penetration include 0.15-0.46 mm of radial clearance and 0.05-0.27 mm of creep, and confirms that the majority of so-called bedding-in observed in the first post-operative months is not entirely due to wear.
背景
本研究旨在测量真实磨损发生前股骨头的穿透情况，并量化各种髋臼设计中分别归因于间隙和塑性变形的部分。
方法
我们分析了 15 名全髋关节置换术（THA）后“第 5 天”患者的 CT 扫描。所有患者均接受 Exafit(®)股骨柄和 28mm 头：5 例患者接受 Durasul(®)全聚乙烯杯固定，5 例患者接受 Allofit(®)金属背衬杯非固定，5 例患者接受 Stafit(®)双动杯非固定。我们还分析了这三种头杯组合的 CT 扫描样本，以比较体内和体外测量。
结果
所有聚乙烯杯（0.196mm）的股骨头穿透测量平均值均低于金属背衬杯（0.551mm）和双动杯（0.634mm）。
结论
本研究表明，股骨头穿透的孤立测量包括 0.15-0.46mm 的径向间隙和 0.05-0.27mm 的蠕变，并且证实了在术后最初几个月观察到的大部分所谓的磨合并非完全由于磨损所致。
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