Roos Test is used to assess which condition?

• A. Thoracic Outlet Syndrome
• B. SI joint provocation
• C. Nerve root impingement
• D. Beevor's Sign

Answer: (A)

Roos test challenges the structures at the thoracic outlet by placing the arms in a provocative position (approximately 90° of abduction with external rotation, elbows flexed, and repetitive opening and closing of the fists). If there is compression of the neurovascular bundle in that space, the patient will often develop symptoms such as numbness, tingling, weakness, or forearm/finger ischemic changes, indicating Thoracic Outlet Syndrome. This test is specifically designed to stress the area where the nerves and vessels pass between the clavicle, first rib, and surrounding muscles, which is why it best identifies TOS. The other options refer to different conditions: SI joint provocation tests assess sacroiliac joint pathology, nerve root impingement is evaluated with radicular signs and tests like Spurling or straight-leg raise, and Beevor's sign points to weakness of abdominal muscles due to thoracic spinal cord or nerve injury, not thoracic outlet issues.