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1. Two hundred and seventeen low-friction arthroplasties performed between November 1962 and April 1969 in 203 patients with failed previous operations have been analysed. 2. The technical details of operation in relation to these conversion problems have been outlined. 3. The quality of the results in relation to pain, mobility and ability to walk has been assessed before operation and one year afterwards, with small numbers at three and five years. 4. Pain was completely relieved or was minimal in 96·3 per cent of the patients, and in no case was the pain worse. 5. The total range of movement was 100 degrees or more in 98·5 per cent. No hip lost movement after conversion. 6. The failures were principally due to infection and to technical difficulties. There were no mechanical failures without a technical or radiological explanation. 7. Low-friction arthroplasty is an excellent salvage procedure, especially for failed cup arthroplasty.

LOW-FRICTION ARTHROPLASTY OF THE HIP FOR THE FAILURES OF PREVIOUS OPERATIONS