Kinematic Alignment Tibial Plateau Osteotomy Technique for Oxford Unicompartmental Knee Arthroplasty of Larger Varus Deformities

Liu Jian; Tu Yihui; Liu Guobin; Li Jia; Huang Ye

Abstract：Objective To provide a reference for treating larger extra-articular deformities,given that the Knee Alignment(KA)technique is considered more effective and yields better clinical outcomes than the traditional mechanical alignment(MA)technique in prosthesis orientation.Methods A retrospective analysis was conducted on 29 patients admitted to the Jishuitan Hospital between July and Decber 2018.From a cohort of 74 cemented medial OUKA patients,29 with a large varus deformity of 5 °～10 ° were enrolled,including 3 males and 26 females,aged 55～81 years,mean age(65.8±6.5)years.Among them,13 patients underwent the KA technique,while 16 received the traditional MA technique.Evaluation included socio-demographic characteristics,femoral varus-valgus angle(FVA),tibial varus-valgus angle(TVA),tibial component and lateral plateau angle(CLPA),components joint angle(CJA),Oxford knee score(OKS),and the Western Ontario and McMaster Universities(WOMAC).Results 29 patients were followed 5 years.The results for patients treated with KA and MA techniques showed significant differences:FVA was(2.2±2.0)° vs(4.7±4.3)°(P＜0.05),TVA was(2.8±2.7)° vs(7.5±2.5)°(P＜0.05),CLPA was(1.1±1.5)° vs(5.0±2.4)°(P＜0.05),and CJA was(-0.3±3.6)° vs(-4.5±4.7)°(P＜0.05).All KA group measurements were smaller,indicating significant differences between groups.However,postoperative OKS and WOMAC scores did not differ significantly between groups(P＜0.05).Conclusion A restored knee alignment and kinematics to the pre-prosthetic status.This study found significant improved accuracy for tibial components using the kinematic alignment technique