Acetabular polyethylene wear volume after hip replacement: Reliability of volume calculations from plain radiographs
Acetabular polyethylene wear volume after hip replacement: Reliability of volume calculations from plain radiographs
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DOI：
10.1016/j.wear.2012.02.006
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发表时间：
2012-04-05
期刊：
影响因子：
5
通讯作者：
Clauss, Martin
中科院分区：
文献类型：
--
作者：
Ilchmann, Thomas;Lueem, Martin;Clauss, Martin
聚乙烯磨损是髋关节置换术后炎症、骨质溶解和松动的主要原因，其相当大的影响需要使用X线片对体积磨损进行有效的体内评估。当前研究分析了通过使用临床前后位（a. p.）评估线性磨损和计算体积的可靠性骨盆的X光片。对翻修时取出的21个聚乙烯髋臼部件进行了分析。在临床正位骨盆X线片上测量线性穿透深度和方向。使用三维（3D）表面检测方法和流体位移（FDM）对髋臼杯进行直接测量。使用各种先前发表的公式计算磨损体积。测量的平均线性磨损为1.02 mm（3D），平均磨损体积为777.2 mm（3）（FDM）。根据测量和计算方法，平均放射线磨损和计算体积分别为1.09-1.2 mm和730.1-813.3 mm（3）。所有的测量和计算都与3D和FDM吻合得很好。不考虑磨损方向会导致磨损体积的高估。测量误差和所用计算公式比矢状面可能的磨损更重要。总之，胶片平面内线性磨损的X射线测量可以提供总磨损体积的可靠估计。(C)2012爱思唯尔有限公司版权所有。
Polyethylene wear is a main contributor to inflammation, osteolysis, and loosening following hip replacement, and its considerable impact necessitates the effective in vivo assessment of volumetric wear using radiographs. The current study analysed the reliability of assessing linear wear and calculating volume through the use of clinical anterior-posterior (a.p.) radiographs of the pelvis. Twenty-one polyethylene acetabular components retrieved at revision were analysed. Linear penetration depth and direction were measured on clinical a.p. pelvis radiographs. Direct measurements of the cups were made with a 3-dimensional (3D) surface detection method and fluid displacement (FDM). Wear volume was calculated using various previously published formulas. The mean measured linear wear was 1.02 mm (3D), the mean wear volume 777.2 mm(3) (FDM). The mean radiographic linear wear and calculated volume were 1.09-1.2 mm and 730.1-813.3 mm(3), respectively, depending on method of measurement and calculation. All measurements and calculations agreed well with the 3D and the FDM. Not taking the direction of wear into account led to an overestimation of the wear volume. Errors of measurement and the used formula of calculation were more important than probable wear in the sagittal plane. In conclusion, radiographic measurements of linear wear in the film-plane can provide a reliable estimation of the total wear volume. (C) 2012 Elsevier B.V. All rights reserved.