OUTCOME OF THE CONTRALATERAL HIP FOLLOWING TOTAL HIP-ARTHROPLASTY FOROSTEOARTHRITIS

One thousand one hundred and sixteen patients who underwent unilateral total hip arthroplasty osteoarthritis between 1970 and 1980 were exam ined for development, progression, and total hip arthroplasty in the c ontralateral joint. At the time of the original surgery, 452 patients were diagnosed with bilateral osteoarthritis and 664 had normal contra lateral hip. The probability of osteoarthritis progressing in the cont ralateral joint is 78.6% at 10 years, with the chance of arthroplasty being 53.8%. The probability of a hip diagnosed as normal developing o steoarthritis is 36.5% at 10 years, with and 8.3% chance of requiring total hip arthroplasty.