van Oudenaarde E
Department of Anatomy and Embryology, University of Nijmegen, The Netherlands.
J Hand Surg Br. 1991 Nov;16(4):420-3. doi: 10.1016/0266-7681(91)90017-i.
The abductor pollicis longus and extensor carpi ulnaris muscles function as a dynamic collateral ligament of the wrist. There are indications of a comparable situation over the carpo-metacarpal joint of the thumb. From experiments with tendon movements, we found that in passive motions of the thumb only the tendons of the superficial division show an excursion, regardless of the position of the wrist joint. However, in motions of the wrist joint the tendons show an identical excursion over an equal distance. These are small in pronation and supination but much larger in the mid-position between them. On some movements of the thumb and the wrist, no tendon excursions can be measured. There are strong indications that the deep division, particularly, has a stabilising function on the basal joint of the thumb.
拇长展肌和尺侧腕伸肌作为腕关节的动态侧副韧带发挥作用。有迹象表明拇指掌指关节处情况类似。通过肌腱运动实验，我们发现，在拇指的被动运动中，无论腕关节处于何种位置，只有浅部的肌腱会有移动。然而，在腕关节运动时，肌腱在相同距离上会有相同的移动。在旋前和旋后时移动较小，但在两者之间的中间位置时移动大得多。在拇指和腕关节的某些运动中，无法测量到肌腱的移动。有充分迹象表明，特别是深部，对拇指的基底关节具有稳定作用。
