Dislocation of the extensor tendon in the hand was often found in rheumatoid arthritis. But traumatic, congenital or idiopathic dislocations were rare.
A case of a 51-year-old patient with this legion who had no previous history of trauma and rheumatoid arthritis was reported. At operation, injuries of radial intertendinous fascia and sagittal band at the metacarpophalangeal joint were observed. The operation was successful.
