Monnet Tony, Desailly Eric, Begon Mickaël, Vallée Claude, Lacouture Patrick
Laboratoire de Mécanique des Solides, UMR 6610 CNRS, Université de Poitiers, BP 30179, 86962 Futuroscope, Chasseneuil Cedex, France.
J Biomech. 2007;40(15):3487-92. doi: 10.1016/j.jbiomech.2007.05.030. Epub 2007 Jul 13.
A recent paper has described a new functional method, the symmetrical centre of rotation (SCoRE), for locating joint centre position [Ehrig, R.M., Taylor, W.R., Duda, G.N., Heller, M.O., 2006. A survey of formal methods for determining the centre of rotation of ball joints. Journal of Biomechanics 39 (15), 2798-2809]. For in vitro analyses, the SCoRE method showed better precision than helical axis (HA) or sphere fitting methods. Despites HA determination is very sensitive to small angular velocity, the International Society of Biomechanics has recommended to use HA for locating the glenohumeral joint centre. This paper aims at comparing the SCoRE method with the HA method for locating in vivo the glenohumeral joint centre according to the movement characteristics. Nine subjects performed 10 cycles of three different movements at two different velocities. For each test (combination of movements) the location of the centre of rotation was estimated with both methods (SCoRE and HA). Analyses focused on the 3D location of the glenohumeral joint centre and on the repeatability of location (standard deviation). This study showed that SCoRE and HA methods yielded the same GH location. Nevertheless, with SCoRE method, the location of the glenohumeral joint centre was different according to the test. This study evidenced that the SCoRE method was more precise than HA method (error of 3 mm versus 4.6 mm) and that the GH location with the SCoRE method was not affected by movements with slow velocities.
最近的一篇论文描述了一种用于确定关节中心位置的新功能方法——对称旋转中心（SCoRE）[Ehrig, R.M., Taylor, W.R., Duda, G.N., Heller, M.O., 2006. 用于确定球窝关节旋转中心的形式化方法综述。《生物力学杂志》39 (15), 2798 - 2809]。对于体外分析，SCoRE方法显示出比螺旋轴（HA）或球体拟合方法更高的精度。尽管HA测定对小角速度非常敏感，但国际生物力学学会仍建议使用HA来确定盂肱关节中心。本文旨在根据运动特征比较SCoRE方法和HA方法在体内确定盂肱关节中心的情况。九名受试者以两种不同速度进行了三种不同运动的10个循环。对于每个测试（运动组合），使用两种方法（SCoRE和HA）估计旋转中心的位置。分析集中在盂肱关节中心的三维位置和位置的重复性（标准差）。这项研究表明，SCoRE方法和HA方法得出的盂肱关节位置相同。然而，使用SCoRE方法时，盂肱关节中心的位置根据测试不同而有所不同。这项研究证明，SCoRE方法比HA方法更精确（误差分别为3毫米和4.6毫米），并且使用SCoRE方法时盂肱关节的位置不受慢速运动的影响。
