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  • Q&A with Australian Health Practitioners

    What is shoulder instability?

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  • Dr Andrei Diacon

    Orthopaedic Surgeon

    Dr Andrei Diacon is an Australian-trained Orthopaedic Surgeon subspecialising shoulder and knee conditions. He takes an evidence-based, patient-centred approach, prioritising non-operative management where appropriate and … View Profile

    Shoulder instability occurs when the ball of the upper arm bone (humeral head) moves out of the shoulder socket (glenoid), either partially (subluxation) or completely (dislocation).

    Because the shoulder has a large range of motion, it relies on the capsule (ligaments), labrum (cartilage rim), and surrounding muscles to keep the joint centred.

    After a first dislocation—often due to injury—the shoulder can become prone to recurrent episodes, which is commonly referred to as chronic shoulder instability.

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