Infraulnar collateral ligament injury of thumb metacarpophalangeal joint

The most common ligament injury of the hand is the injury of the ulnar collateral ligament of the thumb metacarpophalangeal joint, which often results in the loss of thumb-to-finger force and fine pinching ability. In 1961 Weller confirmed that this is a particularly common injury in skiing. Cantero, Reill, and Karutz's data were 53% and 57% due to skiing. Therefore, this injury is also called skiing thumb. The thumb metacarpophalangeal joint is a single hinge joint with an average flexion and extension of 10º to 60º. The joint rotation axis is eccentric, and there are two strong lateral collateral ligaments on each side of the joint capsule to strengthen the collateral ligament and the vice. Ligaments to maintain the passive stability of the joints. The collateral ligament travels from the dorsal outer side of the small head of the first metacarpal to the far palm side. It stops at the lateral nodule of the proximal phalanx. It is 4-8mm wide and 12-14mm thick. The collateral collateral ligament starts from the volar side of the propriolateral collateral ligament on the 1st metacarpal condyle, partially over the volar phalanx, to the volar fibrocartilage, and is tense when the joint is straightened.