[Clinical and functional outcomes of unicompartmental knee arthroplasty in patients with medial compartment knee osteoarthritis across different body mass index categories].

Authors

D H Liu, G Ji, X Wang, H C Zhou, G M Li, G B Liu

Published in

Zhonghua yi xue za zhi. Volume 106. Issue 38. Pages 4143-4149. Oct 20, 2026.

Abstract

Objective: To evaluate the clinical and functional outcomes of unicompartmental knee arthroplasty (UKA) in patients with medial compartment knee osteoarthritis across different body mass index (BMI) categories. Methods: The clinical data of 1 483 patients who underwent medial UKA at the First Hospital of Hebei Medical University between May 2021 and December 2023 were retrospectively analyzed. According to BMI, the patients were divided into 4 groups: BMI<25 kg/m², 25 kg/m²≤BMI<30 kg/m², 30 kg/m²≤BMI<35 kg/m², and BMI≥35 kg/m². Preoperative and postoperative knee function and clinical outcomes were recorded. The primary outcome was the incidence of reoperation. Secondary outcomes included the Knee Society score (KSS), Oxford Knee score (OKS), visual analogue scale (VAS) for pain, and forgotten joint score (FJS). Changes in knee function scores from preoperatively to postoperatively were analyzed within each BMI group, and postoperative function scores, the magnitude of score improvement, and the occurrence of reoperation were compared across BMI groups. Results: The patients had a mean age of (63.0±6.5) years, with a male-to-female ratio of 1∶3.72, and a mean follow-up duration of (33.9±5.3) months. The BMI<25, 25-<30, 30-<35, and≥35 kg/m² groups comprised 317, 790, 325, and 51 patients, respectively. Patients in the BMI≥35 kg/m² group were younger than those in the BMI<25 kg/m² group [(58.9±6.3) years vs (64.3±6.9) years, P<0.001]. The postoperative KSS clinical score, KSS functional score, OKS, and VAS improved significantly compared with the corresponding preoperative values in all BMI groups (all P<0.001). There were no statistically significant differences among the 4 groups in postoperative KSS clinical score, KSS functional score, OKS, VAS score, or FJS, or in the magnitude of improvement in functional scores (all P>0.05). No patient in any group underwent reoperation during follow-up. Conclusions: Medial UKA significantly improves the clinical and functional outcomes of patients across different BMI categories. Patients with a BMI≥35 kg/m² achieve short-to mid-term clinical and functional outcomes comparable to those of patients with lower BMI.

PMID:
42907212
Bibliographic data and abstract were imported from PubMed on 23 Oct 2026.

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