[Objective]To investigate the effect of removal of medial tibial osteophytes during unicompartmental knee arthroplasty(UKA)on postoperative lower limb alignment.[Methods]A retrospective study was done on 186 patients who received UKA in our hospital from December 2019 to December 2021.The difference of osteophyte size and hip-knee-ankle angle(HKA)before and after surgery was compared,and the correlation between them was analyzed.[Results]Compared with those preoperatively,the HKA[(172.9±3.7)°,(177.2± 3.1)°,P＜0.001]increased significantly,while the osteophyte uplift[(3.6±1.9)mm,(0.3±1.0)mm,P＜0.001]decreased significantly postopera-tively.In addition,Kennedy partition[0/1/2/C/3,(30/69/66/21/0),(1/20/89/71/5),P＜0.001]and osteophyte classification[large/medium/small:(21/86/79),(0/5/181),P＜0.001]were significantly improved.Regarding correlation,the preoperative HKA was negatively correlated with preoperative osteopathic values(r=-0.308,P＜0.001).The preoperative HKA was negatively correlated with preoperative and postopera-tive osteophyte difference(r=-0.256,P＜0.001).In addition,there was a significant negative correlation between postoperative HKA and pre-operative osteophyte value(r=-0.163,P=0.026),whereas a significant positive correlation between preoperative and postoperative HKA dif-ference and preoperative osteophyte value(r=0.227,P=0.002),a significant positive correlation between the differences of HKA and osteo-phyte before and after surgery(r=0.239,P＜0.001).[Conclusion]The alignment of lower limbs after UKA is mild varus,which is mainly in-fluenced by preoperative HKA,while the difference of medial tibial osteophytes before and after operation has no a significant impact on postoperative alignment of the lower limb.
unicompartmental knee arthroplastyosteophytealignment of low limb
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