Bankart injury with Hill-Sachs lesion
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At the time the case was submitted for publication Nafisa Shakir Batta had no recorded disclosures.View Nafisa Shakir Batta's current disclosures
History of trauma two weeks ago, now presents with shoulder pain.
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Axial nonarthrographic images clearly show anteroinferior labral injury with bony glenoid avulsion, a periosteal disruption, capsular injury, with free fluid tracking into the subscapularis muscle consistent with bony Bankart lesion. There is detachment of the labrum with mild anterior displacement of the labroligamentous complex. Fluid is seen to interpose between the detached osseous edge of anterior glenoid rim and the labro-osseous fragment. There is subjacent bone marrow edema at the posterolateral humeral head which defines the Hill Sachs lesion. Some edema is also noted at the posterior fibers of deltoid muscle, terminal pectoralis muscle and the coracoclavicular interval.
Coronal images show superior migration of the humeral head hence the incongruency at shoulder joint which contributes in the long run to instability and early rotator tendinosis.
Saggital images show widened anterior rotator cuff interval , which is distended with fluid, with poorly visualized middle glenohumeral ligament which is likely to be torn or damaged. Also seen is fraying and edema at the anteroinferior labrum at site of injury
Anteroinferior dislocation of the shoulder is the commonest type of shoulder dislocation, it involves injury to the anteroinferior glenoid margin with or without injury to the posterosuperior humeral head.
The fibrocartilaginous labrum lines the glenoid cup, deepening it and making the glenohumeral articulation more congruent and stable.
Injuries to the anteroinferior glenoid involve labral tear (soft Bankart) or bony injury, either a fracture fragment or microtrabecular injury (osseous Bankart). There is usually an associated area of subchondral marrow edema at the humeral head with or without a depressed fracture. Needless to say that bone injuries are best assessed on CT.
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