[Thumb hypoplasia].

All the components of the thumb can be involved in congenital hypoplasia. Blauth's classification continues to be helpful for description of the degree of hypoplasia leading to different options of surgical reconstruction. Surgical strategy includes first web deepening, MP ligamentoplasty, thenar augmentation using tendon transfer and correction of associated abnormalities involving the extensor and flexor tendons. For grade IIIB and grade IV, recommended option for reconstruction is index finger pollicisation.