Thoracic Outlet Syndrome (TOS) is a group of conditions caused by compression of neurovascular structures as they travel from the neck to the upper limb. Due to its complex anatomy and symptom overlap with cervical spine and shoulder disorders, TOS is frequently underdiagnosed or misdiagnosed (Hooper et al., 2010). Physiotherapists play a vital role in the conservative management of this condition.
What Is Thoracic Outlet Syndrome?
TOS occurs when the brachial plexus, subclavian artery, or subclavian vein becomes compressed within the thoracic outlet—an anatomical region bordered by the first rib, clavicle, and surrounding musculature (Sanders et al., 2007). Compression most commonly occurs at the interscalene triangle, costoclavicular space, or beneath the pectoralis minor tendon.
Types of Thoracic Outlet Syndrome
Neurogenic TOS (nTOS)
Neurogenic TOS accounts for approximately 70–90% of all TOS cases and involves compression of the brachial plexus (Povlsen et al., 2014). Common symptoms include neck and shoulder pain, paraesthesia in the arm or hand, and upper limb weakness, often exacerbated by overhead activities.
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