James D F, Clark I P, Colwill J C, Halsall A P
J Biomech. 1982;15(2):73-84. doi: 10.1016/0021-9290(82)90038-0.
The mechanics of the metacarpophalangeal joint are analyzed, with a view to understanding why the finger moves in the direction of ulnar drift when the intra-articular pressure in the joint is increased. The first step is the in situ measurement of stiffness of the various tissues surrounding the joint, and the data show that (a) the two collateral ligaments are the major component and (b) the ulnar ligament is the stiffer. This latter result, combined with finding the centre of pressure at the base of the phalanx, reveals how increased intra-articular pressure produces ulnar deviation. Flexion, the other component of ulnar drift, is produced because of the volar side attachment of the ligaments. The mechanics are evaluated quantitatively by the measurement of forces at the finger tip for various pressures; the data agree reasonably well with predictions using the measured joint properties in a simplified mechanical model of the joint.
对手掌指关节的力学原理进行了分析，旨在理解当关节内压力升高时手指为何会向尺侧偏移。第一步是对关节周围各种组织的刚度进行原位测量，数据表明：（a）两条侧副韧带是主要组成部分；（b）尺侧韧带更硬。后一结果与在指骨基部找到压力中心相结合，揭示了关节内压力增加是如何导致尺侧偏斜的。尺侧偏移的另一个组成部分——屈曲，是由于韧带在掌侧的附着所致。通过测量不同压力下指尖的力来定量评估力学原理；数据与在关节简化力学模型中使用测量得到的关节特性进行的预测相当吻合。
