• Danilo Bruni, Michele Gagliardi, Ibrahim Akkawi, Giovanni Francesco Raspugli, Simone Bignozzi, Tedi Marko, Laura Bragonzoni, Alberto Grassi, and Maurilio Marcacci.
• Codivilla-Putti Research Center, Rizzoli Orthopaedic Institute, Bologna, Italy. d.bruni@biomec.ior.it.
• Knee Surg Sports Traumatol Arthrosc. 2016 Jan 1; 24 (1): 182-7.

PurposesTo determine the long-term survival rate of an all-polyethylene tibial unicompartmental knee arthroplasty (UKA) in a large series of consecutive patients and to investigate the possible factors that could influence the outcome.MethodsA retrospective evaluation of 273 patients at 6-13 years of follow-up was performed. Clinical evaluation was based on KSS and WOMAC scores. Subjective evaluation was based on a visual analogue scale for pain self-assessment. Radiographic evaluation was performed to assess femoral-tibial angle (FTA), posterior tibial slope (PTS) and tibial plateau angle (TPA). A Kaplan-Meier survival analysis was performed assuming revision for any reason as primary endpoint.ResultsThe 10-year implant survivorship was 87.6%. Twenty-five revisions (9.2%) were performed, and aseptic loosening of the tibial component was the most common failure mode (11 cases, 4%). The comparison of survival rate according to age at surgery did not show significant difference. Age at surgery, FTA, TPA and PTS were not related to higher risk of revision. No correlations were found between BMI, age at surgery and clinical scores. Finally, no statistical differences of radiographic measurements were found between revisions and non-revisions.ConclusionsThe present study has demonstrated on a large series of patients that UKA with an all-polyethylene tibial component, with an accurate technique and a proper patient selection, can provide a satisfactory clinical and functional outcome and a good overall survivorship of the implant at long-term follow-up. These advantages could be achieved at a lower cost.Level Of EvidenceRetrospective Therapeutic Study, Level IV.

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