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Question category: Rheumatology

A 24 year old female with brittle asthma on long term steroids, presents with sudden onset left hip pain which she is unable to weight bear on. On examination there is no obvious abnormality but there is very limited flexion, internal and external rotation. An X-ray reveals collapse of the femoral head and joint sclerosis. Bloods are normal. What is the most likely diagnosis?

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