[Objective]To compare the mid-term clinical outcomes of lateral unicompartmental knee arthroplasty(UKA)in the treat-ment of post-meniscectomy knee osteoarthritis(PMKO)versus primary knee osteoarthritis(PKOA).[Methods]A retrospective analysis was conducted on 327 patients who underwent initial lateral UKA due to osteoarthritis of the lateral compartment from March 2013 to March 2019.Based on whether they had a history of meniscectomy,the patients were divided into two groups.Of them,38 patients were fall in the PMKO group(meniscectomy group),subsequently,38 patients were selected to be included in the PKOA group(non-meniscectomy group)by paired 1∶1 according to age,gender,and side affected.The documents were compared between the two groups regarding to general information,peri-operative period,clinical follow-up,and imaging data.[Results]The PMKO group was significantly greater than the PKOA group in terms of ratio of trauma history[(yes/no),(36/2)vs(0/38),P＜0.001]and preoperative Q angle[(15.3±3.0)° vs(12.8±3.3)°,P＜0.001],and the severity preoperative lateral compartmental Kellgren-Lawrence(K-L)classification[0/1/2/3/4,(0/0/1/13/24)vs(0/0/3/21/14),P=0.020],while the for-mer proved significantly less than the latter in term of preoperative knee flexion contracture angle[(5.6±3.9)° vs(8.2±4.5)°,P=0.014].There was no statistically significant difference between the two groups in terms of surgical time,total incision length,intraoperative blood loss,post-operative drainage volume,incision healing,and hospital stay(P＞0.05).The male got significantly longer asymptomatic survival period than the female after meniscectomy in the PMKO group(P＜0.05).All patients in both groups were followed up for(63.2±24.6)months on an aver-age,and no revision surgery happened in anyone of them.There were no statistically significant differences in VAS,OKS score,ROM,femoro-tibial angle(FTA),medial proximal tibial angle(MPTA),and posterior tibial slope angle(PTSA)between the two groups at the latest follow-up(P＞0.05).[Conclusion]The mid-term clinical consequence of lateral UKA for knee lateral compartmental osteoarthritis is satisfactory.The history of lateral meniscus resection has no significant impact on the postoperative outcome of lateral UKA.
post-meniscectomy knee osteoarthritislateral compartmental osteoarthritis of the kneelateral unicompartmental knee arthroplastymid-term outcome
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