A Case of Idiopathic Transient Osteoporosis of The Hip in Prepnancy

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Curtiss and Kincaid reported three cases of transient osteoporosis of the hip in pregnancy in 1959. Since then, 6 additional cases have been reported. The mechanism of demineralization remains uncertain.A 38-year-old woman was admitted to our hospital with pain of right hip joint. She was in pregnancy and she complained joint pain from 18 weeks in pregnacy. The patient had joint pain, limited hip motion and radiographic changes showing marked demineralization of the involved femoral head with preservation of the joint space.Laboratory data were normal with the exception of elevated sedimentation rates (ESR) which are compatible with third trimester of pregnancy. There was no history of trauma or infection. The clinical course of this patient was benign with full recovvery in about 6 months by conservative therapy.Mechanical compression of the obturator nerve with selective demineralization of the hip has been suggested as a cause of this syndrome. Obstruction of venous return during pregnancy has also been suggested as the etiology of this syndrome. However in our case no data are available to support these explanations.
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