Perthes' disease after successful conservative treatment of congenital dislocation of the hip.

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Although the case of combination of congenital dislocation of the hip and Perthes' disease may not be rare, the report of this condition is very rare. In 1978 Lindholm et al. reported three such cases as a new disorder. And they thought that the course of Perthes' disease was much more severe than usual in spite of varus osteotomy, because it might be due to changes of the capsule and other soft parts that were primarily adapted to the dislocated position. We reported two cases of this rare combination. Both of them were treated by varus osteotomy. One was not responded to it like previous reports. The other was responded to it well. The acetabular dysplasia of these cases seemed to be much more severe and shallower than that of usual Perthes' disease. We thought that the prognosis of these cases depends upon the development of the acetabulum, especially at the time of growth spurt of the pelvic bone.