The authors have inserted Mc Kee prostheses in 1,000 hips between 1967 and 1977. 616 were reviewed with a follow-up of more than three years. There was an overall infection rate of 2.4 p. cent and of 4.3 p. cent in cases which had previously had operations. The results were satisfactory with 84.7 p. cent giving no pain, using no sticks and with good mobility. 83 cases were reviewed with more than ten years follow-up. 3 out of 4 still have a satisfactory result. Only 14 cases had to be operated on for a second time for loosening with 11 satisfactory results. It is concluded that this type of prosthesis is valuable when compared with other types. Very little wear and no fracture of the stem was seen.