A University of Oxford report examines a long-debated replacement question: during total knee replacement, should surgeons also resurface the underside of the kneecap? Published June 17, 2026, the report covers a 20-year randomized trial involving more than 1,700 patients; the underlying study was published in The Lancet.
Underlying research:
https://www.thelancet.com/journals/lancet/article/PIIS0140-6736%2826%2900652-5/fulltext
Illustrative photo: Surgical team in an operating room. Photo by Soheil Younai via Pexels; not a photograph of the study or the specific procedure discussed
Summary
A University of Oxford report describes the longest randomized clinical trial in knee orthopedics, addressing a question surgeons have debated for decades: during total knee replacement, should the underside of the kneecap also be resurfaced?
Kneecap resurfacing does not replace the entire patella. Surgeons remove its damaged underside and attach a smooth artificial surface so it can move against the new knee joint. Practice varies because earlier evidence did not clearly show whether routine resurfacing produced better long-term results.
Researchers from Oxford and the University of Aberdeen followed more than 1,700 participants in the Knee Arthroplasty Trial for 20 years. Both groups—patients who received kneecap resurfacing and those whose kneecaps were left unchanged—generally had good outcomes. Differences in knee function, complications, and additional surgery were small. However, most measures favored resurfacing.
When patient benefits and health-care costs were considered together, resurfacing was likely to offer better value for the United Kingdom’s National Health Service.
Investigators concluded that resurfacing produced somewhat greater health benefits without adding overall cost and said surgeons should consider it as part of standard care for most patients undergoing total knee replacement.
The findings matter because knee replacement is common and successful, yet up to one in five patients may continue to experience pain or limited function. They do not mean the same choice is right for everyone; decisions still depend on individual health, anatomy, and clinical judgment.
For Replacement.com, the larger lesson is especially relevant: replacement is not simply “old versus new.” Outcomes can depend on which parts are replaced, which are preserved, and how long-term evidence changes the balance.
Citation
Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, “Kneecap resurfacing during knee replacement should be the standard procedure, new study finds,” published June 17, 2026. Summary by Replacement.com with credit and link to the original University of Oxford article.
Underlying research: David W. Murray, J. Hudson, H. Dakin, et al., “Patellar resurfacing in total knee replacement: 20-year clinical and economic results of a large multicentre, randomised controlled trial in the UK,” The Lancet, published online June 17, 2026. DOI: 10.1016/S0140-6736(26)00652-5.