Bade H, Koebke J, Bilger H
Zentrum Anatomie, Universität zu Köln.
Handchir Mikrochir Plast Chir. 1993 May;25(3):116-20.
Apart from the first carpometacarpal joint, the fifth carpometacarpal joint is of importance in gripping and cupping the hand. The present study describes the functional anatomy of the fifth carpometacarpal joint considering morphological and experimental findings. Shape and extension of the cartilaginous articular surface of 50 metacarpal bases show characteristics of a saddle joint. The differences between the dorso-palmar and ulno-radial curvature of the articular surface suggest a main direction of motion in the fifth carpometacarpal joint around an ulno-radial axis. Flexion in this joint ranges from 10 to 15 degrees. After maximal flexion, a supinatory rotation of the metacarpal bone ranging from 10 to 15 degrees is measured. Because of the transverse arched configuration of the carpal bones, the flexion of the fifth metacarpal bone produces opposition towards the thumb. A simultaneous supinatory rotation supports this opposition movement.
除第一掌腕关节外，第五掌腕关节在手部抓握和抱持动作中具有重要作用。本研究结合形态学和实验结果描述了第五掌腕关节的功能解剖结构。50个掌骨基底软骨关节面的形状和伸展显示出鞍状关节的特征。关节面背掌侧和尺桡侧曲率的差异表明第五掌腕关节围绕尺桡轴存在一个主要运动方向。该关节的屈曲范围为10至15度。最大屈曲后，测得掌骨有10至15度的旋后旋转。由于腕骨的横向拱形结构，第五掌骨的屈曲会产生向拇指方向的对掌动作。同时进行的旋后旋转支持这种对掌运动。
