What type of deformity is associated with Erb's Duchenne Palsy?

Erb's Duchenne Palsy is a condition that results from an injury to the upper trunk of the brachial plexus, leading to weakness or paralysis of the muscles innervated by the affected nerves. This primarily impacts the shoulder and arm, particularly the muscles that assist with shoulder abduction and external rotation.

The "waiter's tip deformity" is characterized by the arm being held in a position of extension and internal rotation. The hand is usually in a downward position, resembling a gesture of waiting for a tip. This condition arises because the nerves responsible for flexing the arm and turning the shoulder outwards are damaged, resulting in an inability to raise the arm and a characteristic posture.

This contrasts with the other deformities mentioned. The claw hand deformity is associated with ulnar nerve damage, drop foot deformity occurs due to issues with the peroneal nerve affecting ankle dorsiflexion, and wrist drop deformity is related to radial nerve damage leading to loss of wrist extension. These conditions involve different nerve pathways and muscle groups than those affected in Erb's Duchenne Palsy, which solidifies the association of the waiter's tip deformity specifically with this type of palsy.