内在肌对中指、环指和小指掌指关节屈曲力矩的贡献。

Intrinsic muscle contribution to the metacarpophalangeal joint flexion moment of the middle, ring, and small fingers.

作者信息

Koh Shukuki, Buford William L, Andersen Clark R, Viegas Steven F

机构信息

Department of Hand Surgery, Nagoya University School of Medicine, Nagoya, Japan.

出版信息

J Hand Surg Am. 2006 Sep;31(7):1111-7. doi: 10.1016/j.jhsa.2006.03.003.

DOI:10.1016/j.jhsa.2006.03.003

PMID:16945712

Abstract

PURPOSE

To analyze the relative contribution of the intrinsic muscles to the flexion moment potential of the metacarpophalangeal (MCP) joints of the middle, ring, and small fingers and to calculate the moment potential loss occurring with deep motor branch, low, or high ulnar nerve palsy or low median nerve palsy.

METHODS

Eleven fresh cadaver hands were used. A small wire sutured to each tendon was connected to an excursion transducer containing a constant-tension spring. The tendon excursion and the MCP joint rotation were measured simultaneously during 10 to 16 cycles of passive flexion/extension cyclic motion. The moment arm was calculated from the tendon excursion-joint rotation curve as the derivative of the curve. The flexion moment potential was calculated by multiplying the moment arm with the known tension fractions of the muscles.

RESULTS

When the MCP joint was at 0 degrees of flexion the relative moment potential contributions of the intrinsic muscles to MCP joint flexion were 8%, 13%, and 28% in the middle, ring, and small fingers, respectively. Moment potential losses were 7%, 13%, and 6% in the middle, ring, and small fingers, respectively, in deep motor branch ulnar nerve palsy. In low ulnar nerve palsy the losses were 7%, 13%, and 28%, respectively. In high ulnar nerve palsy they were 7%, 64%, and 82%, respectively. Low median nerve palsy, however, resulted in a moment potential loss at the middle finger MCP joint of less than 2%.

CONCLUSIONS

The relative contribution of the intrinsic muscles to the total flexion moment at the MCP joint was different for each finger. The small finger had a large intrinsic contribution, primarily because of the larger moment arms of the hypothenar muscles.

摘要

目的

分析内在肌对中指、环指和小指掌指关节（MCP）屈曲力矩潜力的相对贡献，并计算在运动深支、低位或高位尺神经麻痹或低位正中神经麻痹时发生的力矩潜力损失。

方法

使用11只新鲜尸体手。将一根缝在每条肌腱上的细金属丝连接到一个装有恒张力弹簧的位移传感器上。在被动屈伸循环运动的10至16个周期中，同时测量肌腱位移和MCP关节旋转。根据肌腱位移-关节旋转曲线计算力臂，作为曲线的导数。通过将力臂与已知的肌肉张力分数相乘来计算屈曲力矩潜力。

结果

当MCP关节处于0度屈曲时，内在肌对MCP关节屈曲的相对力矩潜力贡献在中指、环指和小指中分别为8%、13%和28%。在运动深支尺神经麻痹时，中指、环指和小指的力矩潜力损失分别为7%、13%和6%。在低位尺神经麻痹时，损失分别为7%、13%和28%。在高位尺神经麻痹时，分别为7%、64%和82%。然而，低位正中神经麻痹导致中指MCP关节的力矩潜力损失小于2%。