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.
The use of modular designs of hip prostheses introduces the risk of post-operative disassembly of the components. We report on two cases of alumina-alumina hip arthroplasty in which a spontaneous assembly of the acetabular component occurred. A review of the literature on such complications is also presented.
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