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The study of 9− and 10-year results of Low Friction Arthroplasty (L.F.A.)1 demonstrated a high degree of success in 92 per cent of patients studied.2 These patients were of an average age of about 65 at the time of surgery. Following the successes of total hip replacement in older patients, it is inevitable that surgeons will perform total hip arthroplasties on younger patients who are severely disabled by hip disease. This study was undertaken to evaluate the results of total hip arthroplasty in patients 30 years of age or younger.