Joint replacement surgery in patients under thirty.

Forty-five patients, twenty-six of them with juvenile rheumatoid arthritis, had sixty-seven total hip arthroplasties. The patients' ages ranged from twelve to twenty-nine years. An over-all good result was demonstrated in 93 per cent of the patients had a poor result, in 6.9 per cent. The average follow-up period was 32.5 months. Careful planning in severely dysplastic joints should be done.