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A 74-year-old male patient was admitted for elective hip replacement surgery. X-rays revealed dramatic collapse and deformity of the femoral head over a 13-month period (Figures 1 and 2). He had experienced progressive hip discomfort during an 18-month period before surgery and was taking diclofenac (50 mg three times a day) regularly for discomfort. Despite analgesia, his walking distance had deteriorated from 800 to 100 metres while awaiting surgery.

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