Lin Hui-Ting, Hsu Ar-Tyan, Chang Guan-Liang, Chang Chien Jia-Rea, An Kai-Nan, Su Fong Chin
Department of Physical Therapy, I-Shou University, Kaohsiung County, Taiwan.
Phys Ther. 2007 Dec;87(12):1669-82. doi: 10.2522/ptj.20050391. Epub 2007 Oct 2.
The resting position is frequently used by clinicians in the examination and early treatment of patients with joint impairments. However, there is a lack of research on the kinematic characteristics of the resting position of the glenohumeral (GH) joint. The aim of this study was to define the resting position of the GH joint by quantifying the humeral head translation and axial rotational range of motion (ROM).
The anterior and posterior translation of the humeral head and the rotational ROM of the dominant arm were assessed in the seated position at multiple abduction positions in 15 subjects who were healthy by use of an electromagnetic tracking device. A force of 80 N and a torque of 4 N.m were applied during the measurement procedures for the translation of the humeral head and the rotational ROM, respectively.
The mean resting position determined by rotational movement was located at 49.8 degrees of GH abduction. However, the mean resting position determined by translational movement was located at 23.7 degrees of GH abduction and was significantly lower than the resting position determined by rotational movement (t=5.45, P=.000).
The mean resting position for rotational movement is consistent with the already accepted range of 30 to 60 degrees for a "loosely packed" position of the GH joint. The mean resting position for translational movement appears to be lower than 30 to 60 degrees. The results of this study suggest that, at least for the GH joint, different resting positions should be assessed with different movement criteria (accessory or physiological movement).
临床医生在检查和早期治疗关节损伤患者时经常使用静息位。然而，关于肩肱（GH）关节静息位的运动学特征缺乏研究。本研究的目的是通过量化肱骨头平移和轴向旋转运动范围（ROM）来确定GH关节的静息位。
使用电磁跟踪设备，在15名健康受试者的坐位下，于多个外展位置评估优势臂肱骨头的前后平移和旋转ROM。在测量肱骨头平移和旋转ROM的过程中，分别施加80 N的力和4 N·m的扭矩。
通过旋转运动确定的平均静息位位于GH外展49.8度处。然而，通过平移运动确定的平均静息位位于GH外展23.7度处，且显著低于通过旋转运动确定的静息位（t = 5.45，P = .000）。
旋转运动的平均静息位与已被认可的GH关节“松弛位”30至60度的范围一致。平移运动的平均静息位似乎低于30至60度。本研究结果表明，至少对于GH关节，应使用不同的运动标准（附属或生理运动）来评估不同的静息位。
