When the trapezius and serratus anterior muscles become weak and atrophied and the arms are pushed forward, the medial edge of the scapula appears as a free-like, relatively high projection, like a bird’s wing, called a pterygoid scapula. Pterygoid scapula is seen in patients with progressive muscular dystrophy and is mainly caused by weakness and atrophy of the scapular band muscles. The pterygoid scapula is more pronounced when the forearm is pushed forward. In the lower extremities and hips, a duck walk may occur due to weakness and atrophy of the pelvic muscles. The child may also appear to have to roll over to a prone position when standing up from a supine position and then support the lower extremities to stand up.