ArticleArchives of orthopaedic and trauma surgery2026
Long-term outcomes and revision-free survival following robotic-assisted unicompartmental and total knee arthroplasty.
Article in Archives of orthopaedic and trauma surgery, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundWhile robotic assistance improves precision in unicompartmental (R-UKA) and total knee arthroplasty (R-TKA), long-term comparative data are limited. This study evaluated perioperative outcomes and mid- to long-term survivorship for R-UKA versus R-TKA.
methodsA retrospective review was performed of 163 patients who underwent primary, elective, R-UKA (n = 84) or R-TKA (n = 79) between 2011 and 2020 at a single, tertiary academic medical center, with a minimum follow-up of five years. Demographics, perioperative characteristics, and postoperative outcomes were compared between cohorts. Revision-free implant survivorship was evaluated using Kaplan–Meier analysis.
resultsR-TKA procedures had longer operative times than R-UKA (131 vs. 112.5 min; P < 0.001) and both were performed primarily for primary osteoarthritis. Cohorts had similar 90-day ED visit rates (3.8 vs. 4.8%; P = 1), for both surgical (2.5 vs. 3.6%) and medical causes (1.3 vs. 1.2%), while readmission rates were also similar (2.5 vs. 3.6%, P = 1). Median follow-up (9.55 vs. 6.07 years) and time since surgery (12.33 vs. 7.48 years) were significantly longer for R-UKA (both P < 0.001). At final follow-up, revision occurred in 3.8% of R-TKA and 4.8% of R-UKA cases (P = 1). Time to revision was shorter for R-TKA (1.36 vs. 5.22 years; P = 0.114). Kaplan–Meier analysis demonstrated 5-year revision-free survivorship of 96.2% for R-TKA and 97.6% for R-UKA, with the overall log-rank test showing no significant survivorship difference between groups (P = 0.866).
conclusionsIn this cohort, R-UKA and R-TKA demonstrated favorable long-term survivorship with no statistically significant differences in ED visits, readmissions, or revision rates. These findings show comparable safety profiles and low revision rates at long-term follow-up for both procedures, suggesting that for patients meeting specific indications for either procedure, robotic-assisted knee arthroplasty provides durable outcomes for appropriately selected patients.
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