Imaeda T, An K N, Cooney W P
Biomechanical Research Laboratory, Mayo Clinic, Rochester, Minnesota.
Hand Clin. 1992 Feb;8(1):9-15.
The thumb is a mechanical unit consisting of strong ligaments and dynamic muscles, providing the resistance to the fingers and palm during pinch and grip. Each thumb joint has a mechanical equivalent that helps explain elements of thumb stability. The trapeziometacarpal joint is potentially the most unstable but has adapted to its unique position by special joint geometry and, in particular, a combination of support ligaments that permit a wide range of motion yet stability. New anatomic and mechanical studies demonstrate the key support structures that must be duplicated by reconstructive surgical procedures if thumb stability is to be maintained.
拇指是一个由强壮韧带和动态肌肉组成的机械单元，在捏取和抓握时为手指和手掌提供阻力。每个拇指关节都有一个机械等效物，有助于解释拇指稳定性的要素。大多角骨与第一掌骨间关节可能是最不稳定的，但通过特殊的关节几何结构，尤其是通过允许广泛运动但保持稳定的支撑韧带组合，适应了其独特的位置。新的解剖学和力学研究表明，如果要维持拇指稳定性，重建手术必须复制关键的支撑结构。
