A 2-year-old child presents with a history of birth trauma involving hyperabduction of the arm. On examination, the child exhibits weakness in the wrist and finger flexors, and the intrinsic muscles of the hand. The most likely clinical deformity observed in this child would be:

Explanation

Klumpke's palsy, resulting from lower brachial plexus injury (C8, T1), typically presents with weakness of the intrinsic hand muscles and wrist/finger flexors. This leads to a characteristic 'claw hand' deformity, where the metacarpophalangeal joints are hyperextended and the interphalangeal joints are flexed. Waiter's tip deformity is seen in Erb's palsy (upper brachial plexus). Wrist drop is associated with radial nerve injury. Ape hand deformity is associated with median nerve injury.