Sayed-Noor Arkan S, Hugo Anders, Sjödén Göran O, Wretenberg Per
Department of Orthopaedic Surgery, Sundsvall Hospital, 851 86, Sundsvall, Sweden.
Int Orthop. 2009 Oct;33(5):1189-93. doi: 10.1007/s00264-008-0633-9. Epub 2008 Aug 2.
Measurement of leg length discrepancy is an important part in planning a successful total hip arthroplasty (THA). Many clinical and radiological methods with variable degrees of accuracy have been advocated to carry out this measurement. We studied the accuracy of a commonly used clinical method by comparing it to a well-known and reliable radiological method. A total of 139 patients aged 44-89 (mean: 67.5 years) scheduled to undergo THA were examined for clinical and radiological leg length discrepancy measurements before and after the operation by the same observers. There was a poor correlation between the clinical and radiological methods preoperatively [r = 0.21, intra-class correlation coefficient (ICC) = 0.33]. The correlation was better postoperatively (r = 0.45, ICC = 0.62). The clinical method used is not recommended for leg length discrepancy measurement preoperatively. Caution should even be taken when using this method postoperatively. The authors recommend using the radiological method when measuring leg length discrepancy as a part of planning for THA.
测量下肢长度差异是成功规划全髋关节置换术（THA）的重要环节。人们提倡采用许多准确性各异的临床和放射学方法来进行此项测量。我们通过将一种常用的临床方法与一种知名且可靠的放射学方法进行比较，研究了该临床方法的准确性。共有139例年龄在44 - 89岁（平均67.5岁）计划接受THA的患者，由相同的观察者在术前和术后对其进行临床和放射学下肢长度差异测量。术前临床方法与放射学方法之间的相关性较差[r = 0.21，组内相关系数（ICC）= 0.33]。术后相关性更好（r = 0.45，ICC = 0.62）。所使用的临床方法不建议用于术前下肢长度差异测量。即使在术后使用该方法时也应谨慎。作者建议在测量下肢长度差异作为THA规划的一部分时采用放射学方法。
