The fibrous dysplasia, divided into 3 categories of the monostotic, polyostotic and extraskeletal forms, is a relatively rare disease which was first reported by Well in 1922 and shows a characteristic findings replacing the medullary cavity of noe or more bones by the pathologically proliferating fibrous connective tissues. In a consequence, the structural integrity of the diseased bone becomes weakened and suffers frequent episodes of pathologic fracture and deformities of the bone, which are most common around the hip. Various operative methods and instruments have been tried to manage the pathologic fracture around the hip recently. The authors report a satisfactory resnlt of total hip replacement for the pathologic fracture in a patient of the fibrous dysplasia involving the proximal half of the right femur.