From Labral Tears to Bone Loss: Imaging the Spectrum of Shoulder Instability

Area of Science:

• Orthopedics
• Radiology
• Sports Medicine

Background:

• Glenohumeral instability arises from disrupted joint stabilizers, causing dislocation or apprehension.
• Anterior instability is common, but posterior instability is distinct and often overlooked.
• Effective diagnosis and treatment rely on understanding unique biomechanical and clinical features.

Purpose of the Study:

• To provide a comprehensive review of imaging modalities for glenohumeral instability.
• To detail the role of imaging in diagnosing labral pathology, capsuloligamentous injuries, and bone loss.
• To emphasize how precise imaging guides management for both anterior and posterior instability.

Main Methods:

• Review of standard and advanced imaging techniques including radiographs, CT, MRI, 3D CT, ZTE MRI, and MR arthrography.
• Assessment of imaging's utility in identifying structural abnormalities like labral tears, capsuloligamentous injuries, and osseous defects.
• Focus on imaging's role in evaluating bone loss and soft tissue pathology.

Main Results:

• Various imaging modalities are crucial for evaluating glenohumeral instability.
• Advanced techniques like 3D CT and ZTE MRI improve bone loss assessment.
• MR arthrography enhances detection of soft tissue injuries, particularly labral pathology.

Conclusions:

• Accurate imaging assessment is critical for diagnosing glenohumeral instability.
• Understanding the imaging spectrum aids in differentiating anterior and posterior instability patterns.
• Precise imaging interpretation is essential for guiding optimal management strategies and improving patient outcomes.