Takagoshi H, Hashizume H, Nishida K, Masaoka S, Asahara H, Inoue H
Department of Orthopaedic Surgery, Okayama University Medical School, Japan.
Acta Med Okayama. 1998 Feb;52(1):19-26. doi: 10.18926/AMO/31338.
The fibrous components of the metacarpophalangeal (MP) joint including the palmar plate, the collateral ligament and the dorsal plate were studied with particular attention paid to the fibrous structure of the fibrous tendon sheath and the deep transverse metacarpal ligament. The tough fibrillar structure around the MP joint, especially the force nucleus, consisted of three types of mixed fibers: the fibrous tendon sheath of the A1 pulley, the deep transverse metacarpal ligament, and the palmar plate. The tendon sheath was located on the ulnar side in the index and middle fingers, on the central position in the ring finger, and on the radial side in the little finger. These fibrous connections among the fingers formed a transverse arch in the hand. The palmar plate of the MP joint was relatively rigid and appears to function as a cushion when flexed. A fold-like protrusion of the synovial layer of the palmar plate of the MP joint had a meniscoid function, which was larger than that of the proximal interphalangeal joint. The capsule of the MP joint was thicker at the dorsal area, forming a dorsal plate, which is a sliding floor of the extensor mechanism and has a meniscoid function for joint congruity. The main lateral stabilizer consisted of collateral ligaments and accessory collateral ligaments anchored to the palmar plate. These structures act together as a "phalangeal cuff", connecting the proximal phalanx to the metacarpal head and stabilizing the MP joint.
对掌指（MP）关节的纤维成分进行了研究，包括掌板、侧副韧带和背侧板，特别关注了纤维腱鞘和掌骨深横韧带的纤维结构。MP关节周围坚韧的纤维状结构，尤其是力核，由三种混合纤维组成：A1滑车的纤维腱鞘、掌骨深横韧带和掌板。腱鞘在示指和中指位于尺侧，在环指位于中央位置，在小指位于桡侧。手指间的这些纤维连接在手部形成了一个横弓。MP关节的掌板相对较硬，在屈曲时似乎起到缓冲作用。MP关节掌板滑膜层的褶皱状突起具有半月板样功能，比近端指间关节的半月板样功能更大。MP关节的关节囊在背侧区域较厚，形成背侧板，它是伸肌机制的滑动面，对关节的一致性具有半月板样功能。主要的外侧稳定结构由侧副韧带和附着于掌板的副侧副韧带组成。这些结构共同作为一个“指骨套”，将近节指骨连接到掌骨头并稳定MP关节。
