What is the purpose of the Roos Test?

The Roos Test is specifically designed to evaluate thoracic outlet syndrome (TOS). This condition involves compression of the neurovascular structures in the thoracic outlet, which can result from anatomical abnormalities, trauma, or repetitive movements. During the Roos Test, the patient is instructed to hold their arms in a specific elevated position while performing repetitive motions, typically by opening and closing their hands. A positive test is indicated by the reproduction of symptoms such as pain, numbness, or tingling in the arms, which suggests that thoracic outlet syndrome is present due to potential compression of the brachial plexus or subclavian vessels.

In contrast to this, the other choices pertain to entirely different conditions and evaluations. Assessing glenoid labrum tears or diagnosing lateral collateral ligament sprains focuses on different anatomical structures and testing methods specific to the shoulder and knee, respectively. Evaluating intrinsic muscle tightness would involve a different set of assessments aimed at determining flexibility or muscle length, which is unrelated to neurovascular compression in the thoracic outlet. Thus, the Roos Test's clear focus on thoracic outlet syndrome distinguishes it as the correct answer for identifying this specific condition.