Twenty-nine total hip replacement arthroplasties in twenty-four patients with osteoarthritis or rheumatoid arthritis of the hip were performed in our clinic.Total hip replacement arthroplasty utilizing the Mckee-Farrar prosthesis or Sbarbaro prosthesis relieved pain in eighteen of twenty-three diseased hips and improved the ability to walk, mobility and A. D. L. for periods of follow-up ranging from six months to three years.In this series eight complications occurred after twenty-nine replacement procedures.These complications included three loosenings of the socket, two non-unions of the greater trochanter, two periarticular ossifications and one dislocation.