Boese Christoph Kolja, Frink Michael, Jostmeier Janine, Haneder Stefan, Dargel Jens, Eysel Peer, Lechler Philipp
Department of Orthopedic and Trauma Surgery, University Hospital of Cologne, Cologne, Germany.
Center of Orthopedic and Trauma Surgery, University of Giessen and Marburg, Marburg, Germany.
Biomed Res Int. 2016;2016:8645027. doi: 10.1155/2016/8645027. Epub 2016 Dec 14.
. The femoral neck-shaft angle (NSA) is of high importance for the diagnostics and treatment of various conditions of the hip. However, rotational effects limit its precision and applicability using plain radiographs. This study introduces a novel method to measure the femoral NSA: the modified NSA (mNSA), possibly being less susceptible against rotational effects compared to the conventional NSA. . The method of measurement is described and its applicability was tested in 400 pelvis computed tomography scans (800 hips). Age- and gender-dependent reference values are given and intra- and interrater reliability are analyzed. . The mean age of all 400 patients (800 hips) was 54.32 years (18-100, SD 22.05 years). The mean mNSA was 147.0° and the 95% confidence interval was 146.7°-147.4°. Differences of the mNSA between sexes, age groups, and sides were nonsignificant. The absolute difference between NSA and mNSA was 16.3° (range 3-31°; SD 4.4°); the correlation was high (0.738; < 0.001). Overall, the intra- and interrater reliability were excellent for the mNSA. . We introduced a novel concept for the analysis of the neck-shaft angle. The high reliability of the measurement has been proven and its robustness to hip rotation was demonstrated.
股骨颈干角（NSA）对于髋关节各种病症的诊断和治疗至关重要。然而，旋转效应限制了其在普通X线片上的精度和适用性。本研究介绍了一种测量股骨NSA的新方法：改良NSA（mNSA），与传统NSA相比，它可能对旋转效应的敏感性较低。描述了测量方法，并在400例骨盆计算机断层扫描（800个髋关节）中测试了其适用性。给出了年龄和性别相关的参考值，并分析了评分者内和评分者间的可靠性。所有400例患者（800个髋关节）的平均年龄为54.32岁（18 - 100岁，标准差22.05岁）。mNSA的平均值为147.0°，95%置信区间为146.7° - 147.4°。mNSA在性别、年龄组和左右侧之间的差异无统计学意义。NSA与mNSA的绝对差值为16.3°（范围3 - 31°；标准差4.4°）；相关性较高（0.738；P < 0.001）。总体而言，mNSA的评分者内和评分者间可靠性极佳。我们引入了一种分析颈干角的新概念。测量的高可靠性已得到证实，并且证明了其对髋关节旋转的稳健性。
