Glenohumeral arthritis is defined by shoulder pain and stiffness from damage to the articulation between the humeral head and the glenoid process of the scapula. This arthritis may be idiopathic (osteoarthritis), or from autoimmune synovial inflammation (rheumatoid arthritis). Other known causes include trauma (including microtrauma from altered biomechanics or rotator cuff tears), gout, osteonecrosis, neuropathy (Charcot Arthropathy) and infection.
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