A Rare Case of Congenital Flexion-Adduction Deformity of the Thumb

Congenital clasped thumb is characterized by a tightly flexed and adducted thumb. This condition is the result of imbalance from various causes, that is, the weakness or absence of extensor muscles and tendons, the result of arthrogryposis, the complication of the hypoplastic thumb, or others.We experienced a rare case of bilateral congenital flexion-adduction deformity of the thumb. The extensor muscles and tendons were neither weak nor absent, and the thumbs were passively abducted and extended. But the extensor pollicis brevis tendon was adhesive to the glididing floor.This is a report of the findings and the surgical management.