What is the purpose of the resisted supination external rotation test?

The resisted supination external rotation test is primarily designed to identify SLAP (Superior Labrum Anterior to Posterior) lesions. During this test, the clinician evaluates the stability and integrity of the biceps tendon as well as the surrounding labrum, particularly the superior aspect of the labrum where the biceps tendon inserts. A positive test usually indicates that there may be a tear or a lesion in that specific area of the labrum, which can cause pain and instability during certain shoulder movements.

The rationale behind the test involves the mechanics of the shoulder and the way in which the biceps tendon and labrum interact during forearm supination and external rotation. Since SLAP lesions often occur due to repetitive overhead activities or trauma, this test effectively reproduces the symptoms associated with such injuries.

In contrast, the other options focus on different structures or functions unrelated to SLAP lesions. Assessing ulnar nerve function pertains to nerve injuries and their related symptoms rather than labral tears. Evaluating biceps tendon integrity is a consideration, but it does not encompass the specific nature of SLAP lesions. Testing for rotator cuff tears involves different maneuvers that target the rotator cuff muscles and tendons rather than the superior labrum specifically.