In a multi-centre trial of 503 adults with severe persistent frozen shoulder symptoms were randomised to arthroscopic capsular release (ACR), manipulation under anaesthesia (MUA), or physiotherapy. Arthroscopic capsular release was significantly better than manipulation under anaesthesia and physiotherapy, but the differences were small and unlikely to be clinically significant. Arthroscopic capsular release has significant side effects such as stroke, pneumonia, deep vein thrombosis.
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