(a)Department of Orthopaedics, Hospital Ca'n Misses, Eivissa, Spain.
J Hand Ther. 2013 Oct-Dec;26(4):312-7; quiz 317. doi: 10.1016/j.jht.2013.07.003. Epub 2013 Sep 12.
Experimental laboratory-based research in biomechanics.
The mechanisms by which some lunotriquetral (LTq) ligament disruptions remain stable are not known.
To investigate the contribution of muscles in preventing carpal destabilization when the LTq ligaments are torn.
Ten fresh cadaver wrists, set vertical in a jig, were isometrically loaded through five wrist motor tendons. Changes in carpal alignment secondary to the application of loads were monitored by a Fastrak™ electromagnetic motion tracking device, before and after sectioning the LTq ligaments.
After LTq ligaments sectioning, wrist loading forced the triquetrum into flexion (5.4° average) and supination (2.9 ). The only muscle capable of extending and pronating the collapsed triquetrum was the extensor carpi ulnaris (ECU).
Inadequate ECU muscle function is an important destabilizing factor in LTq deficient wrists. Dynamic LTq instabilities may benefit from proprioceptionally training the ECU muscle, while avoiding carpal supination torques.
基于生物力学的实验性实验室研究。
某些月三角（LTq）韧带撕裂后仍保持稳定的机制尚不清楚。
研究当 LTq 韧带撕裂时，肌肉在防止腕骨不稳定方面的作用。
将十个新鲜的尸体手腕垂直固定在夹具中，通过五个手腕运动肌腱等长加载。在切断 LTq 韧带之前和之后，通过 Fastrak™电磁运动跟踪装置监测由于施加负荷引起的腕骨对线的变化。
切断 LTq 韧带后，手腕受力使三角骨向掌屈（平均 5.4°）和旋前（2.9°）。唯一能够伸展和旋前塌陷三角骨的肌肉是尺侧腕伸肌（ECU）。
ECU 肌肉功能不足是 LTq 缺失手腕不稳定的一个重要因素。动态 LTq 不稳定性可能受益于通过本体感觉训练 ECU 肌肉，同时避免腕骨旋前扭矩。
