• Ammar Qutub, Amjad Ghandurah, Adel Alzahrani, Ahmed Alghamdi, and Talal M Bakhsh.
• From the Department of Surgery, King Abdulaziz University, Jeddah, Saudi Arabia.
• Ann Saudi Med. 2021 Sep 1; 41 (5): 299-306.

BackgroundIsolated involvement of the medial compartment of the knee in degenerative disease is encountered in about 25% of patients with gonarthrosis. We aim to show that in a well-selected group of such patients, medial unicompartmental knee arthroplasty (UKA) is a good option.ObjectivesReview the functional outcomes of patients undergoing UKA and determine the long-term survivorship of the implants and complications of the procedure.DesignAnalytical retrospective chart review.SettingAcademic tertiary care medical center and tertiary care private hospital in the western region of Saudi Arabia.Patients And MethodsWe selected patients who underwent medial UKAs by the same surgeon between December 1988 and December 2009. The life table approach and the Kaplan-Meier statistical method were used to estimate the survival rate (5-30 years) with revision as the endpoint. Functional outcome scores were determined according to the Knee Society Clinical Rating System.Main Outcome MeasuresChange in performance scores for pain, walking, and range of movement. Survivorship of the implants with removal of the implant as the endpoint; post-operative complications.Sample Size218 implants on 142 patients.ResultsThe survival rate of UKA was 94.7% at 10 years (95% CI 0.906-0.970), 80.9% at 20 years (95%CI 0.724-0.871), and 77.8% at 30 years (95%CI 0.669-0.855). The average grand total functional score increased from 61 (maximum 200) at 0 months to above 150 at ≥6 months.ConclusionUKA is a good option for isolated medial compartment gonarthrosis with excellent functional outcome and good survivorship in selected patients.LimitationSingle center experience, retrospective. We lost 6.0% of patients during follow-up. Comparison with other treatment modalities is based on literature review and not on our own data.Conflict Of InterestNone.

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