Which muscle lengthening targets are included in thoracic outlet syndrome physical therapy?

• A. Scalenes, levator scapulae, and pectoralis minor
• B. Hamstrings and calves
• C. Biceps and brachialis
• D. Abdominals only

Answer: (A)

Thoracic outlet syndrome symptoms stem from compression of the neurovascular structures as they pass through the thoracic outlet. The muscles most often targeted for lengthening in physical therapy are the scalenes, levator scapulae, and pectoralis minor. Tight scalenes can narrow the space between the first rib and the clavicle, especially with certain head and arm positions, reducing room for the brachial plexus and subclavian vessels. A shortened pectoralis minor pulls the shoulder girdle forward and down under the clavicle, further constricting the passage under the coracoid process. Levator scapulae tension can shift and stabilize the upper back and shoulder region, contributing to altered scapular mechanics that affect the thoracic outlet. Lengthening these muscles helps open up the outlet and can alleviate symptoms.

The other options involve muscles that aren’t primary contributors to thoracic outlet compression. The hamstrings and calves are lower-body muscles, not involved in the outlet through which the neurovascular bundle travels. The biceps and brachialis act at the elbow and do not typically change the space at the thoracic inlet/outlet. The abdominals influence trunk movement, but they don’t directly impact the mechanical space around the thoracic outlet.