Lempereur Mathieu, Brochard Sylvain, Rémy-Néris Olivier
CHU de Brest, Hôpital Morvan, service de médecine physique et de réadaptation, Brest, F-29200, France.
Comput Methods Biomech Biomed Engin. 2013;16(1):6-11. doi: 10.1080/10255842.2011.597386. Epub 2011 Aug 1.
Functional methods can be used to determine the centre of rotation (CoR) of a ball-and-socket joint. The algorithms are used to locate rather the hip joint centre than the glenohumeral joint centre. The choice of the most suitable method depends especially on the intra- and inter-session repeatability of these methods. This paper aims at evaluating the intra- and inter-session repeatability of functional methods with which the glenohumeral joint rotation centre (GHRC) can be estimated in vivo. It also estimates the most suitable amplitude of functional movements. Five functional methods were tested: the algorithms of Gamage and Lasenby, bias compensation, symmetrical CoR estimation, normalisation method and helical axis. Ten subjects performed three cycles of three different movements (flexion-extension, abduction-adduction and circumduction). These movements were repeated three times with three different ranges of motion. Six subjects came back in order to evaluate the inter-session repeatability. For each test, the location of the GHRC was estimated by the five methods. The method to solve the functional problem and the range of functional movement affected the GHRC location. The results showed a good to excellent intra-session repeatability. The lowest repeatability error was found for the high amplitude whatever the methods used. The inter-session reliability was moderate. Finally, we suggest the use of functional methods with high amplitude movement in order to locate the GHRC with the best reliability.
功能方法可用于确定球窝关节的旋转中心（CoR）。这些算法用于定位髋关节中心而非肱骨头关节中心。选择最合适的方法尤其取决于这些方法在不同时间段内的重复性以及不同受试者间的重复性。本文旨在评估功能方法在体内估计肱骨头关节旋转中心（GHRC）时的不同时间段内的重复性以及不同受试者间的重复性。同时还估计了最合适的功能运动幅度。测试了五种功能方法：Gamage和Lasenby算法、偏差补偿、对称CoR估计、归一化方法和螺旋轴法。十名受试者进行了三种不同运动（屈伸、内收外展和环转）的三个循环。这些运动在三种不同的运动范围内重复进行三次。六名受试者返回以评估不同时间段间的重复性。对于每次测试，通过五种方法估计GHRC的位置。解决功能问题的方法和功能运动范围会影响GHRC的位置。结果显示不同时间段内的重复性良好至优秀。无论使用何种方法，高幅度运动的重复性误差最低。不同时间段间的可靠性为中等。最后，我们建议使用高幅度运动的功能方法以最可靠地定位GHRC。
