Gallo J, Havránek V, Zapletalová J, Mandát D
Ortopedická Klinika LF UP a FN Olomouc.
Acta Chir Orthop Traumatol Cech. 2006;73(1):28-33.
The aim of the study was to present our own method of measuring acetabular polyethylene wear in total hip arthroplasty, including assessment of basic measurement characteristics. It is a well known fact that, in total hip replacement, polyethylene liners wear out with use. The rate of acetabular polyethylene wear can then be related to clinical or demographic data.
Our method, using a universal measuring microscope, is based on the ability of exact identification of central positions of the head of total hip replacement before implantation and after prosthesis removal. The difference between the original and final positions allows us to calculate both linear and volumetric wear of polyethylene. During one month, the same components were repeatedly measured by two independent investigators and a total of 10 ABG 1 acetabular components were checked. The results of measurements were evaluated by a series of statistical tests, including correlation and regression analyses and analysis of variance.
High correlations were found among individual measurements made by each observer (r = 0.998; r = 0.973) as well as between the mean values obtained from the two observers (r = 0.996). The reliability of measurements was proved by a high correlation of the regression curve of each measurement with the "ideal" line. With two exceptions, the differences between paired measurements were not significant.
Our method facilitates an in vitro measurement of polyethylene wear with considerable accuracy and high reliability.
本研究的目的是介绍我们自己测量全髋关节置换术中髋臼聚乙烯磨损的方法，包括评估基本测量特征。在全髋关节置换术中，聚乙烯衬垫会随着使用而磨损，这是一个众所周知的事实。髋臼聚乙烯磨损率可与临床或人口统计学数据相关。
我们的方法使用万能测量显微镜，基于在植入前和取出假体后精确识别全髋关节置换股骨头中心位置的能力。原始位置和最终位置之间的差异使我们能够计算聚乙烯的线性磨损和体积磨损。在一个月内，两名独立研究人员对相同部件进行了重复测量，共检查了10个ABG 1髋臼部件。测量结果通过一系列统计测试进行评估，包括相关性和回归分析以及方差分析。
每个观察者的个体测量之间（r = 0.998；r = 0.973）以及两名观察者获得的平均值之间（r = 0.996）发现高度相关。每个测量的回归曲线与“理想”线的高度相关性证明了测量的可靠性。除两个例外，配对测量之间的差异不显著。
我们的方法有助于在体外以相当高的准确性和可靠性测量聚乙烯磨损。
