Tang J, Shi D, Liu Z
Department of Hand Surgery, Affiliated Hospital of Nantong Medical College, Nantong 226001.
Zhonghua Wai Ke Za Zhi. 1998 Jan;36(1):46-9.
To study the changes in dynamics of wrist motor tendons after perilunate instability of the wrist.
14 cadaver upper extremities were used. Excursions of the principle wrist and finger motor tendons were measured during wrist flexion-extension and radiolunar deviation was determined. Data were collected in the intact wrist, then in the wrist with stage I, II and III perilunate instability. The average moment arms of the tendons during wrist motion were calculated.
The moment arms of the wrist flexors increased and those of the finger flexors decreased after instability. Increase in the moment arms dominated changes of radial side wrist motors, while decrease in the moment arms dominated ulnar wrist motors. Moment arms of the flexor carpi radialis tendon showed a consistent increase during wrist motion.
The changes in wrist dynamics play an important role in clinical manifestations of perilunate instability. The significance of kinetic information on principle of treatment of the instability is discussed.
研究腕月骨周围不稳定后腕部运动肌腱的动力学变化。
使用14具尸体上肢。在腕关节屈伸过程中测量主要腕部和手指运动肌腱的移动度，并确定桡月侧偏斜度。数据先在完整腕关节采集，然后在处于I、II和III期月骨周围不稳定的腕关节采集。计算腕关节运动过程中肌腱的平均力臂。
不稳定后腕部屈肌的力臂增加，手指屈肌的力臂减小。力臂增加主导桡侧腕部运动的变化，而力臂减小主导尺侧腕部运动的变化。桡侧腕屈肌腱的力臂在腕关节运动过程中持续增加。
腕部动力学变化在月骨周围不稳定的临床表现中起重要作用。讨论了动力学信息在该不稳定症治疗原则上的意义。
