Department of Orthopaedic Surgery, Kyoto University Graduate School of Medicine, Kyoto, Japan.
J Hand Surg Eur Vol. 2021 Oct;46(8):842-846. doi: 10.1177/1753193420963257. Epub 2020 Oct 22.
We investigated the functional anatomy of the radial sagittal band and possible mechanisms involved in its spontaneous and traumatic rupture using seven cadaveric hands. First, the extensor tendon excursion and the change in angle between the sagittal bands and the tendon path were measured during metacarpophalangeal joint flexion. The radial bands were then divided in two different ways that mimicked spontaneous or traumatic rupture. We found no significant correlation between the extensor tendon excursion and the change in angle of the sagittal bands in the middle and ring fingers. Dislocation could occur when the radial sagittal band was only partially divided. This may explain why conservative treatment of tendon dislocation in the middle and ring fingers is feasible. Complete section of the sagittal bands in the little finger caused ulnar dislocation of the extensor tendon in only one out of seven hands.
我们研究了桡侧矢状带的功能解剖结构，以及使用 7 只尸体手研究其自发性和外伤性破裂的可能涉及的机制。首先，在掌指关节弯曲过程中测量伸肌腱的伸展程度以及矢状带与肌腱路径之间的角度变化。然后，将桡侧带以两种不同的方式分割，模拟自发性或外伤性破裂。我们发现，中环指的伸肌腱伸展程度与矢状带角度的变化之间没有显著相关性。当桡侧矢状带仅部分分裂时可能会发生脱位。这可能解释了为什么在中环指中保守治疗肌腱脱位是可行的。只有在 7 只手中的 1 只手，小指的矢状带完全切断才导致伸肌腱向尺侧脱位。
