The Alar Ligament Stability Test is a simple, quick diagnostic tool for assessing stability at an athlete's shoulder joint. This test uses resistance applied by a clinician's hands to assess the strength of the shoulder joint's alar ligament. It is used to assess the integrity of the shoulder joint and its ligaments, in addition to diagnosing shoulder instability. It is a valuable assessment for evaluating shoulder injuries and can provide important information for designing an effective rehabilitation program.