Schweizer Andreas, Moor Beat K, Nagy Ladislav, Snedeker Jess G
Orthopaedic Department, Universitätsklinik Balgrist, CH 8008 Zürich, Switzerland.
J Biomech. 2009 Aug 25;42(12):1856-61. doi: 10.1016/j.jbiomech.2009.05.025. Epub 2009 Jul 28.
The aim of the study was to investigate the influence of a preceding flexion or extension movement on the static interaction of human finger flexor tendons and pulleys concerning flexion torque being generated. Six human fresh frozen cadaver long fingers were mounted in an isokinetic movement device for the proximal interphalangeal (PIP) joint. During flexion and extension movement both flexor tendons were equally loaded with 40N while the generated moment was depicted simultaneously at the fingertip. The movement was stopped at various positions of the proximal interphalangeal joint to record dynamic and static torque. The static torque was always greater after a preceding extension movement compared to a preceding flexion movement in the corresponding same position of the joint. This applied for the whole arc of movement of 0-105 degrees . The difference between static extension and flexion torque was maximal 11% in average at about 83 degrees of flexion. Static torque was always smaller than dynamic torque during extension movement and always greater than dynamic torque during flexion movement. The kind of preceding movement therefore showed an influence to the torque being generated in the proximal interphalangeal joint. The effect could be simulated on a mechanical finger device.
本研究的目的是调查先前的屈曲或伸展运动对人类手指屈肌腱与滑车在产生屈曲扭矩方面的静态相互作用的影响。将六根人类新鲜冷冻尸体的长手指安装在用于近端指间（PIP）关节的等速运动装置中。在屈伸运动过程中，两根屈肌腱均承受40N的均等负荷，同时在指尖描绘产生的力矩。在近端指间关节的不同位置停止运动，以记录动态和静态扭矩。在关节相应的相同位置，先前进行伸展运动后的静态扭矩始终比先前进行屈曲运动后的更大。这适用于0至105度的整个运动弧度。在大约83度屈曲时，静态伸展扭矩与屈曲扭矩之间的差异平均最大为11%。在伸展运动期间，静态扭矩始终小于动态扭矩，而在屈曲运动期间，静态扭矩始终大于动态扭矩。因此，先前运动的类型对近端指间关节产生的扭矩有影响。这种效应可以在机械手指装置上模拟出来。
