Shoulder Instability in Hyperlaxity and Collagen Disorders
摘要
The shoulder joint has a broad range of motion, maintained by a balance between mobility and stability. Static and dynamic stabilizers achieve this balance. The static stabilizers include the glenohumeral articular congruity, glenoid labrum complex, glenohumeral ligaments, and negative intra-articular pressure. The rotator cuff muscles, the long head of the biceps tendon, and the periscapular musculature provide dynamic stability. When this delicate balance is disturbed, it can result in multidirectional instability (MDI). MDI is often caused by microtrauma in athletes involved in overhead sports or by hypermobility due to systemic conditions like Ehlers-Danlos syndrome (EDS) and related disorders. Shoulder instability can lead to pain and functional disability and pose significant challenges in both diagnosis and management. Clinical assessments, such as the Beighton scoring system for hypermobility and specific tests for joint laxity, are used to diagnose shoulder instability. Imaging modalities like MRI and CT scans can also help identify structural anomalies. Conservative treatments like strengthening exercises and proprioceptive training are the primary management strategy. Innovative nonsurgical options like “shoulder pacemakers” are also emerging as effective treatments. However, if conservative measures fail, individualized surgical interventions like capsular shift, rotator interval closure, and arthroscopic plication may be necessary to restore stability and function. Managing shoulder instability in the context of hyperlaxity is complex. Early diagnosis and patient-specific treatment planning are essential. To achieve optimal outcomes, both nonoperative and operative strategies should be integrated. The ultimate goal is to alleviate pain, restore functional stability, and improve the quality of life for individuals affected by this challenging condition.