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The Roos test is performed to assess for the presence of thoracic outlet disorders.
The seated patient is asked to abduct the shoulder to 90 degrees and then fully externally rotate. With the upper extremities held in this position, the patient rapidly flexes and extends the fingers for up to three minutes.
If the patient has reproduction of pain or numbness in the shoulder or arm or if the involved arm fatigues more rapidly than the uninvolved, the test is considered positive and may indicate the presence of a thoracic outlet syndrome. Thoracic outlet syndrome can arise through compression of the subclavian artery or brachial plexus as they exit through the scalene triangle, pass between the clavicle and the first rib, or as they pass under the coracoid process.
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