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A continuous learning-curve cumulative summation (LC-CUSUM) analysis of total surgical duration was performed against an independently defined surgeon-specific historical benchmark derived from institutional operative-register skin-to-skin times for manual UKA performed by the same surgeon (20\u2009\u00b1\u20094\u00a0min). Adequate performance was defined as a mean duration of 25\u00a0min, inadequate performance as 30\u00a0min, and the reference standard deviation as 4\u00a0min. Type I and type II error targets were 0.05 and 0.10, respectively; the decision boundary was calibrated by Monte Carlo simulation over a 30-case monitoring horizon. Robotic time and a supportive comparison of cases 1\u20135 versus 6\u201330 were secondary efficiency analyses. Postoperative radiographic measurements were performed by an observer blinded to the planned and robot-validated ROSA\n                      <jats:sup>\u00ae<\/jats:sup>\n                      values. Agreement was quantified using Bland\u2013Altman bias and 95% limits of agreement.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Mean robotic time was 14.5\u2009\u00b1\u20092.4\u00a0min, mean non-robotic time was 8.9\u2009\u00b1\u20093.1\u00a0min (range, 4.1\u201315.6), and mean total surgical duration was 23.4\u2009\u00b1\u20092.3\u00a0min. The continuous LC-CUSUM score crossed the calibrated decision boundary (h\u2009=\u20094.5895) at case 6. Robotic time was 16.0\u2009\u00b1\u20093.8\u00a0min in cases 1\u20135 and 14.2\u2009\u00b1\u20092.0\u00a0min in cases 6\u201330 (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.787); corresponding total durations were 24.8\u2009\u00b1\u20093.8 and 23.1\u2009\u00b1\u20091.9\u00a0min (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.385). Bland\u2013Altman bias for postoperative minus planned measurements was +\u20090.13\u00b0 for tibial coronal alignment and +\u20090.10\u00b0 for tibial slope; bias for postoperative minus robot-validated HKA was +\u20090.34\u00b0. All 30 postoperative radiographic measurements were within \u00b1\u20092\u00b0 of the planned target for both tibial coronal alignment and slope (100%; exact 95% CI, 88.43%\u2013100%).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>The predefined platform-specific temporal-performance standard was reached after six cases by an experienced high-volume UKA surgeon. Tibial planned-to-postoperative deviations were small in this consecutive series, while the findings remain conditional on the specified benchmark and require external validation.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00402-026-06497-9","type":"journal-article","created":{"date-parts":[[2026,9,2]],"date-time":"2026-09-02T03:39:22Z","timestamp":1788320362000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Platform-specific learning curve and early tibial radiographic agreement of ROSA\u00ae-assisted medial unicompartmental knee arthroplasty in an experienced high-volume surgeon: a consecutive case series"],"prefix":"10.1007","volume":"146","author":[{"given":"Stefano","family":"Petrillo","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Damiano","family":"Ardiri","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matteo","family":"Marullo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sergio","family":"Romagnoli","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,9,2]]},"reference":[{"key":"6497_CR1","doi-asserted-by":"publisher","DOI":"10.1136\/bmj.l352","volume":"364","author":"HA Wilson","year":"2019","unstructured":"Wilson HA, Middleton R, Abram SGF, Smith S, Alvand A, Jackson WF et al (2019) Patient relevant outcomes of unicompartmental versus total knee replacement: systematic review and meta-analysis. 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