Garcia-Elias M, Orsolini C
Hand and upper extremity surgery, institut Kaplan, Barcelona, Spain.
Chir Main. 2011 Jun;30(3):224-7. doi: 10.1016/j.main.2011.04.002. Epub 2011 May 7.
To investigate the relationship between thumb laxity (passive mobility), shape of the trapezium and trapezial mobility relative to the second metacarpal.
Sixty normal volunteers were assessed for the amount of thumb laxity by measuring the shortest distance of the thumb nail to the radius when the thumb was forcefully approximated to the forearm with the wrist in flexion. The inclination of the distal surface of the trapezium (angle β) and the mobility of the trapezium relative to the II metacarpal (Δangle α) were assessed using dynamic X-rays in maximal radial and ulnar deviation.
There was no statistical correlation between thumb laxity and shape of the trapezium (angle β). However, trapezium mobility (Δangle α) and thumb laxity were strongly correlated (P=0.018), with the more lax individuals registering higher trapezium mobility.
This investigation does not support the concept of thumb hypermobility being associated to a trapezium with more pronounced inclination of its distal articular surface. However, it has been found that the higher the thumb mobility, the more the trapezium tilts under load.
研究拇指松弛度（被动活动度）、大多角骨形状以及大多角骨相对于第二掌骨的活动度之间的关系。
60名正常志愿者参与研究，通过测量在手腕屈曲时将拇指用力靠近前臂时拇指指甲到桡骨的最短距离来评估拇指松弛度。使用动态X射线在最大桡偏和尺偏时评估大多角骨远侧表面的倾斜度（β角）以及大多角骨相对于第二掌骨的活动度（α角变化）。
拇指松弛度与大多角骨形状（β角）之间无统计学相关性。然而，大多角骨活动度（α角变化）与拇指松弛度密切相关（P = 0.018），拇指越松弛的个体大多角骨活动度越高。
本研究不支持拇指活动过度与远侧关节面倾斜度更明显的大多角骨相关的概念。然而，已发现拇指活动度越高，大多角骨在负荷下倾斜越大。
