Although it is an uncommon injury, traumatic rupture of the sagittal band often results in subluxation or dislocation of the extensor digitorum communis tendon. The radial sagittal band prevents ulnar subluxation of the extensor tendon at the metacarpophalangeal joint. Injury may result from a direct blow to the hand or from relatively low-energy mechanisms. Symptoms range from metacarpophalangeal joint pain and edema to dislocation of the extensor tendon. Associated injuries include collateral ligament sprains, capsular injury, and osteochondral fractures. Many acute injuries can be managed nonsurgically with extension splints. Optimal management of subacute or chronic injuries remains undefined. Surgical management consists of repair or reconstruction of the radial sagittal band. Numerous adjunctive surgical techniques have been described to prevent subluxation of the extensor tendon.
Keywords: Trauma; boxer’s knuckle; extensor tendon instability; sagittal band.
Copyright 2015 by the American Academy of Orthopaedic Surgeons.