[Fresh ulnar capsule-ligament injuries of the metacarpophalangeal joint of the thumb. Primary surgical management with extension wires with the aid of a modified Kirschner wire].

One of the most common injuries of the hand is the rupture of the ulnar collateral band of the metacarpophalangeal articulation of the thumb. As the fresh rupture is often overseen, a clarification by use of comparative X-rays in maximum abduction is indispensible. Fresh ulnar complete bandruptures or osseus, distal outbursts with wide diastasis of the bone fragment, should always be treated operatively within the first eight days, as to avoid an eventually necessary bandplastik later on. A modified Kirschner-wire, concavely excavated on its proximal end to facilitate the provision of the drillholes, alleviates the sufficiently known technique with extension wires; hence the operating time is reduced and so additionally the risk of infection is lowered. This hypothesis is verificated by 22 cases.