Effects of Fixed Bearing Unicompartment Knee Arthroplasty and Intercondylar Fossa Plasty Surgery for Treatment of Knee Medial Compartment Osteoarthritis with Moderate Fixed Flexion Deformity

Zhang Meiying; Xu Mai; Dai Shiyou; Ma Zhenhua; Wang Shengying; Hu Guangliang

Abstract：Objective To observe the early clinical effects of fixed bearing unicompartment knee arthroplasty(FBUKA)combined with intercondylar fossa plasty surgery(IFPS)in the treatment of knee medial compartment osteoarthritis accompanied by moderate fixed flexion deformity.Methods A retrospective analysis was conducted on the clinical data of 50 elderly patients with knee medial compartment osteoarthritis and moderate fixed flexion deformity admitted to Qingdao Municipal Hospital from November 2021 to June 2023.Among these patients,there were 24 males and 26 females,aged 64 to 75 years,with a mean age of(69.69±3.53)years.Based on different treatment approaches,patients were divided into a research group and a control group,with 25 patients in each.The research group underwent FBUKA and IFPS,while the control group underwent total knee arthroplasty(TKA).Comparisons were made between the two groups in terms of Lysholm score,hospital for special surgery(HSS)score,and visual analogue scale(VAS)score before surgery and at post-surgery.Additionally,knee flexion deformity angles were measured before surgery and 12 months post-surgery to compare the improvement in knee extension degrees between the groups.Results All patients were followed 12 months.All patients completed the follow-up.The research group had better Lysholm,HSS,and VAS scores than the control group at 14 days,6 weeks,and 3 months post-surgery,with statistically significant differences(all P＜0.05).However,no statistically significant differences were observed between the groups at 6 months and 12 months post-surgery(P＞0.05).Twelve months after surgery,the control group showed greater degrees of deformity correction compared to the research group,with a statistically significant difference(P＜0.05).Conclusion For elderly patients with osteoarthritis and moderate fixed flexion deformity,FBUKA combined with IFPS can effectively alleviate pain and improve knee joint function.However,the correction angles for flexion deformity are smaller compared to those achieved with TKA.