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The management of primary acetabular dysplasia. Its association with habitual side-lying



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Abstract

Fifty-one infants with limited abduction of the hip and acetabular dysplasia were, between 1969 and 1975, treated with abduction-adduction exercises, administered by the parents; no abduction devices were used. In 1983 a follow-up examination was carried out on 41 of these patients. Although at birth these children had characteristics similar to patients with congenital dislocation of the hip, none of their hips dislocated. At birth acetabular measurements showed that half the children had severe dysplasia and the other half slight dysplasia; the difference between the affected and the healthy hips was significant. At follow-up the gait was normal in all the patients. Movements at the hips were symmetrical and within normal limits in all but one patient. The acetabular angle, the centre-edge angle, the shaft-neck angle, the hip ratio, and the size of the femoral head were the same on the previously affected side as on the normal side. Nineteen of the children followed up had preferred lying on one side and dysplasia of the upper hip had developed. The significance of the sleeping position on the development of acetabular dysplasia is discussed.

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