Salva-Coll G, Garcia-Elias M, Leon-Lopez M M, Llusa-Perez M, Rodríguez-Baeza A
Department of Hand and Microsurgery, Son Llàtzer Hospital and Ibacma Institute, Palma de Mallorca, Spain.
J Hand Surg Eur Vol. 2012 Jul;37(6):544-8. doi: 10.1177/1753193411430921. Epub 2011 Nov 24.
Ten cadaveric forearms were tested using a wrist testing apparatus specifically designed to investigate the mechanisms of muscle stabilization of the wrist. The specimens were set in a jig allowing the distal row to migrate proximally and rotate around the axis of pronosupination. The extensor carpi ulnaris (ECU) was loaded with specific weights. Reactive rotations of the scaphoid, triquetrum, and capitate were measured by an electromagnetic motion tracking device. Loading the ECU caused pronation of both proximal and distal rows. After sectioning its sheath, the overall direction of the movement remained unchanged, but there was a 40% and 50% decrease of the pronation power over the distal and proximal carpal row, respectively. In addition to stabilizing the distal radiolunar joint, the ECU is an important structure that contributes to the dynamic stability of the wrist. Furthermore, its sheath plays a crucial role in maintaining the effect of the ECU muscle on the carpus.
使用专门设计用于研究腕部肌肉稳定机制的腕部测试装置对10个尸体前臂进行了测试。标本被放置在一个夹具中，使远侧列能够向近端移动并围绕旋前旋后轴旋转。尺侧腕伸肌（ECU）被加载特定重量。通过电磁运动跟踪装置测量舟骨、三角骨和头状骨的反应性旋转。加载ECU会导致近侧列和远侧列均发生旋前。切断其腱鞘后，运动的总体方向保持不变，但远侧腕骨列和近侧腕骨列的旋前力量分别下降了40%和50%。除了稳定桡月远侧关节外，ECU是有助于腕部动态稳定的重要结构。此外，其腱鞘在维持ECU肌肉对腕骨的作用方面起着关键作用。
