Over Half of Hip Replacements Expected to Last 25 Years
Second review shows 82.3 and 69.8 percent 25-year survival for total, unicondylar knee replacement
FRIDAY, Feb. 15, 2019 (HealthDay News) -- In more than half of patients, hip replacements may be expected to last 25 years, while most knee replacements will last 25 years, according to two reviews published in the Feb. 16 issue of The Lancet.
Jonathan T. Evans, M.B., Ch.B., M.D., from Bristol Medical School in the United Kingdom, and colleagues conducted a systematic review and meta-analysis to examine survival and implant data for primary, conventional hip replacement constructs in patients with osteoarthritis. The researchers identified 140 articles reporting 150 series; 44 of these series were included for a total of 13,212 total hip replacements. Data were provided for 92 series with 215,676 hip replacements from national joint replacement registries in Australia and Finland. From case series and joint replacement registries, the 25-year pooled survival of hip replacements was 77.6 and 57.9 percent, respectively.
In a second study, Evans and colleagues conducted a systematic review and meta-analysis to assess how long a knee replacement lasts. Thirty-three case series were identified in 30 eligible articles, which reported all-cause survival for 6,490 total knee replacements (TKRs) and 742 unicondylar knee replacements (UKRs). The researchers found that based on one case series, the estimated 25-year survival for UKR was 72.0 percent; no case series reported 25-year survival for TKR. Registries contributed 47 series with 299,291 TKRs and five series with 7,714 UKRs. The 25-year survival in the pooled registry was 82.3 and 69.8 percent for TKR and UKR, respectively.
"We would like to work together with all the other countries who hold long term data on hip or knee replacement survival to expand our understanding of the long-term outcomes of joint replacement," Evans said in a statement.