Introduction: Partial knee arthroplasty became more popular and achieved in some countries 20% among all knee arthroplasties. 

Materials and Methods: Our prospective research was a single-center study based on 234 UKA. All UKA were performed by one surgeon from March 2018 till November 2023 . Among 234 UKA 10 procedures were bilateral. The mean age was 63.8 (39- 82), BMI was 37.4 (31.6–44.2). The mean follow up was 36 months (from 3 to 66). Our goal was to evaluate all complications and found relations between all possible conditions.

Result: All complications 16 (6.8%) were divided in 2 groups: one group without conversion into TKA and the second group was with conversion TKA, 5 (2.1%)/11 (4.7%). Complications in the first group were treated conservatively or by local surgery. These complications were early. The reason for conversion TKA were PE insert luxation 4 (1.7 %), residual pain 4 (1.7%), which related to arthritis progression in two cases and with insert impeachment in one case, infection 2 (0,9%) and aseptic loosening 1 (0.4%). The mean time to revision was 17.3 months. The most difficult was to identify the reason of residual pain. The most difficult case for us was the PE conflict with femur condyle. This patient has hyperextension about 10 degrees. We didn’t  identify any relationship between complications and the learning curve, as also between BMI. But we marked the relationship with the interval between surgery more than two weeks and the surgeon tiredness. We met in literature the relationship between surgeon tiredness, but in common surgery, not in orthopaedics.

Conclusion: The medial UKA is the best procedure for medial arthritis. To analyze the complication after we can understand the patients unsatisfaction and their selection for UKA. We are still careful about the recurvatum knee to perform UKA.

Valeriy Murylev graduated from Sechenov University in 1993 and has been working in the Department of Orthopaedics at the same institution since then. He is currently a professor at Sechenov University and serves as the head of the City Arthroplasty Center at S. P. Botkin Moscow Multidisciplinary Scientific and Clinical Center. Professor Murylev has authored more than 250 publications, with an h-index of 6, and is a member of the editorial boards of several scientific journals.