Horii E, An K N, Linscheid R L
Department of Orthopedics, Mayo Clinic/Mayo Foundation, Rochester, Minn 55905.
J Hand Surg Am. 1993 Jan;18(1):83-90. doi: 10.1016/0363-5023(93)90250-7.
To allow continuous and simultaneous measurements of tendon excursion and joint rotation angles, we developed a system using an electric potentiometer and an electromagnetic tracking device. Instantaneous moment arms of each tendon could then be calculated on the basis of the slope of the curve between tendon excursion and joint angular displacement. Five prime wrist motor tendons were studied on freshly frozen cadavers. Calculated tendon moment arms were found to be consistent throughout a full range of flexion-extension wrist motion and radioulnar deviation and corresponded closely to the anatomic location and orientation of the tendons. The flexor carpi ulnaris tendon provided the largest moment contribution to the wrist joint. Forearm rotation did not affect the function of the wrist tendon except for the extensor carpi ulnaris. During flexion-extension motion, the excursion of the extensor carpi ulnaris decreased significantly from 10 to 4 mm, with the forearm in neutral and pronated positions. During radioulnar deviation, the excursion of the extensor carpi ulnaris increased from 14 to 17 mm with the forearm in supinated and pronated positions.
为了能够连续同时测量肌腱偏移和关节旋转角度，我们开发了一种使用电位器和电磁跟踪装置的系统。然后，可以根据肌腱偏移和关节角位移之间曲线的斜率计算每条肌腱的瞬时力臂。在新鲜冷冻的尸体上研究了五条主要的腕部运动肌腱。计算得出的肌腱力臂在腕关节的全范围屈伸运动和桡尺偏斜过程中是一致的，并且与肌腱的解剖位置和方向密切对应。尺侧腕屈肌腱对腕关节的力矩贡献最大。除尺侧腕伸肌外，前臂旋转不影响腕部肌腱的功能。在屈伸运动中，前臂处于中立位和旋前位时，尺侧腕伸肌的偏移量从10毫米显著减少至4毫米。在桡尺偏斜过程中，前臂处于旋后位和旋前位时，尺侧腕伸肌的偏移量从14毫米增加至17毫米。
