Sesamoid arthrodesis for hyperextension of the thumb metacarpophalangeal joint.

Forty-two sesamoid arthrodeses performed since 1986 were reviewed. Thirty-seven cases were considered successful. Hypertension recurred in 3 of the 20 procedures performed for cerebral palsy and 1 of the 21 performed in association with basal joint arthroplasty for arthritic conditions. The single post trauma case was successful. Flexion was preserved. Prevention of hyperextension of the metacarpophalangeal joint assists in reducing metacarpal adduction in cerebral palsy and has a stabilizing effect in basal joint arthroplasty.