Primary shortening of the pollicized long flexor tendon in congenital pollicization.

Primary shortening of the flexor digitorum profundus tendon to the pollicized index finger was routinely performed during all congenital pollicizations over a 3-year period. Interphalangeal joint flexion of the pollicized digit was observed to begin within weeks after pollicization. The rebalancing of the pollicized long flexor musculotendinous unit has the potential for greater long-term strength.