We present a case of a 45-year-old woman who developed a transient osteoporosis in her right hip that resolved spontaneously after four months. Three years after she developed an avascular necrosis of her left hip. It is controversial if transient osteoporosis and avascular necrosis are two separate clinical entities or if they are different grades of the same disease. We describe both entities and discuss these two theories based on the findings of our case.
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