(HealthDay News)  Among elderly patients receiving total hip replacements for osteoarthritis, the risk of revision hip replacement is highest in the 18 months after surgery and among those aged 6575 years at time of surgery, according to research published in the Oct 17 issue of The Journal of Bone & Joint Surgery.

Jeffrey N. Katz, MD, from Brigham and Women’s Hospital in Boston, and colleagues retrospectively analyzed the risks of revision and of death among 51,347 elderly Medicare beneficiaries who had elective total hip replacement for osteoarthritis from 19951996.

Over a 12-year follow-up period, the researchers found that the risk of revision total hip replacement was highest in the first 18 months, at 2% per year, then declining to 1% per year. The absolute risk of death was considerably higher than the risk of revision total hip replacement in patients aged ≥75 years at surgery (59% vs. 5.7%), but less so in patients who were 6575 years old (29% vs. 9.4%). The relative risk of revision was significantly higher in men versus women (hazard ratio [HR], 1.23); in patients 6575 years old vs. ≥75 years at surgery (HR, 1.47); and in patients whose doctors performed fewer than six total hip replacements versus those who performed more than 12 (HR, 1.21).

“Efforts to reduce the number of revision hip arthroplasties should be targeted at revisions occurring in the first 18 months following the index arthroplasty, when revision risk is higher, and at younger patients, who are more likely to survive long enough to require revision,” Katz and colleagues conclude.

One or more of the authors disclosed financial ties to an entity in the biomedical arena.

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