MRI Findings in Anterior Shoulder Dislocation
MRI findings of anterior shoulder dislocation typically include:
-
-
Bankart Lesion: The anterior glenoid labrum tears, typically in the 3-6 o’clock position, leading to shoulder instability and repeated dislocations.
-
Hill-Sachs Defect: A compression fracture occurs on the posterolateral side of the humeral head due to the glenoid rim’s impaction during dislocation. This defect is seen in 75-100% of patients with anterior instability.
-
Labral Tears: Bankart lesions can extend beyond the typical 3-6 o’clock position, but labral variants usually don’t occur in this area, making diagnosis easier.
-
Bone Loss: Recurrent dislocations cause significant bone loss and erosion on the anterior glenoid rim, contributing to chronic instability.
Diagnosing these InjuriesTo accurately diagnose these injuries, MRI uses specific views:-
Axial and Sagittal Views: These assess the extent of labral tears and bone defects.
-
Coronal-Oblique Views: These evaluate the Hill-Sachs defect and glenoid rim fractures.
Accurate Diagnosis and TreatmentFor effective treatment planning, MRI findings should be correlated with clinical symptoms and other diagnostic modalities, such as X-rays or CT scans. This ensures a comprehensive understanding of the injury and guides the best course of treatment. -