Clinical calcium
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A subchondral insufficiency fracture of the femoral head (SIF) is a recently proposed concept, which has generally been observed in elderly women with osteoporosis as well as in patients who have undergone a renal transplantation. In addition, this fracture is sometimes seen in young adults. ⋯ Therefore, the shape of the low intensity band generally tends to be irregular, disconnected, and convex to the articular surface. This finding has been considered to be useful for the differentiation with osteonecrosis.