Description
Background: The indication of uni-compartimental knee arthroplasty is restricted by multiple criteria. The aim of this study is to explore the functional results of uni-compartimental knee arthroplasty (UKA) in a population outside of some of the classical criteria.
Methods: A population of 129 patients who underwent UKA for medial osteoarthritis between 2017 and 2020 were included. Two groups of patients were compared, those meeting the classical criteria and those presenting at least one contraindication: age > 75 years, BMI > 30 or coronal limb deformity >8°. The implant used was fixed-bearing primary medial UKA. The minimal follow up was 3 years. The primary outcome was the functional results according to the Knee Society Score and the secondary outcomes were the complication and revision rates.
Results: 62 patients were included in the indication group (Group 1) and 67 in the off-indication group (Group 2). No significant difference was observed between the two groups for height, sex ratio, operated side, location of osteoarthritis or stage osteoarthritis (p-Value > 0.05). There was no significant difference between KSS in the two groups (p-value = 0.96). At 3-years follow-up, survival rate without revision was 100% in the indication group and 95.38% for the off-indication group (p = 0.57). The rate of complication was 12.9% in the indication group and 8.96% in the off-indication group (p = 0.47)
Conclusion: UKA for medial osteoarthritis allows same functional results for patient presenting at least one theoretical contraindication between BMI >30, Age > 75 and coronal limb deformity >8° without altering the complication or revision rate at 3 years follow up.
