How long will a knee replacement last?


  • Mary Corcoran
  • Univadis Medical News
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A new global study, which set out to assess how long a knee replacement can last, has found more than eight in 10 total knee replacements will last for approximately 25 years. 

Researchers reviewed case series involving knee replacements as well as data from national joint replacement registries, which hold more than 15 years’ worth of data to estimate the survival of knee replacements. 

From 4,363 references found, 33 case series in 30 eligible articles reported all-cause survival for 6,490 TKRs (26 case series) and 742 UKRs (7 case series). No case series reporting on patellofemoral replacements met the inclusion criteria, and no case series reported 25-year survival for TKR. The estimated 25-year survival for UKR (based on 1 case series) was 72.0 per cent (95% CI 58.0-95.0).

Registries contributed 299,291 TKRs (47 series) and 7,714 UKRs (5 series). The pooled registry 25-year survival of TKRs (14 registries) was 82.3% (95% CI 81.3-83.2) and of UKRs (4 registries) was 69.8 per cent (95% CI 67.6-72.1).

The study is published in the Lancet.