Thoracic Outlet Syndrome (TOS)

Thoracic Outlet Syndrome (TOS):

• A neurovascular (nerves & blood vessels) compression between the neck and shoulder.
• The thoracic outlet is composed of the anterior scalene muscle, medial scalene muscle, clavicle, and first rib.
• Activities and postures of the upper extremity can impede circulation by putting pressure on the blood vessels within the thoracic outlet.
• Decreased circulation results in oxygen and nutrient deprivation to surrounding tendons, ligaments, and muscles.  
• Muscle recovery and activity duration are slowed and limited.
• Common symptoms of TOS include pain, paresthesias, and weakness in the involved arm. 
• Symptoms often follow the ulnar nerve distribution in the hand (little finger and ulnar side).

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