Analysis of Postoperative Component Positioning and Early Clinical Outcome after Robot-assisted Unicompartmental Knee Arthroplasty
Objective To compare the early clinical outcomes and postoperative component positioning of robot-assisted unicompartmental knee arthroplasty(RAUKA)with conventional manual unicompartmental knee arthroplasty(UKA)in the treatment of medial knee osteoarthritis.Methods Patients who underwent UKA in our hospital from June 2022 to October 2022 were selected and their clinical data were analyzed retrospectively.In all these patients,32 patients(32 knees)who underwent UKA assisted by robot served as the RAUKA group,and 32 patients(32 knees)with conventional manual UKA performed during the same period by a 1∶1 matching according to age,sex,and side of the operated limb were included in the traditional UKA group.There were 7 males and 25 females in the RAUKA group,with an age of(69.2±6.1)years.There were 6 males and 26 females in the traditional UKA group,with an age of(68.9±5.8)years.The operation time and the knee society score(KSS),the visual analogue scale(VAS),the forgotten joint score(FJS)were recorded and compared between the two groups.The femoral component internal and external rotation angle(angle A),femoral component flexion and extension angle(angle B),tibial component internal and external rotation angle(angle E),tibial component posterior inclination angle(angle F),the overall score of component deviation and tibiofemoral angle(FTA),hip-knee-ankle angle(HKA),the distribution of the Kennedy zone of the lower limbs postoperatively were measured and compared between the two groups.Results All patients in the two groups were successfully given the surgery with a mean postoperative follow-up of(13.8±1.3)months.The operative time and intraoperative osteotomy time in the RAUKA group were significantly longer than those in the conventional UKA group(P＜0.05).There were statistically significant difference in angle A and angle B between the two groups(P＜0.05).The total component deviation score in the RAUKA group was significantly better than that in the conventional UKA group(P＜0.05).Comparison of the angle E,angle F,FTA,HKA,distribution of the Kennedy zone of the mechanical axis of the lower limb,the KSS,VAS,FJS between the two groups showed no statistically significant difference(P＞0.05).There were no complications such as infection or component loosening during the follow-up period in both groups.Conclusion RAUKA offers advantages over conventional UKA in terms of more precise postoperative component positioning and superior postoperative lower limb alignment.Conventional UKA is superior to RAUKA in terms of operating time.The short-term efficacy of RAUKA is excellent,but the long-term outcomes need to be further investigated.
Medial osteoarthritis of the kneeUnicompartmental knee arthroplastyRobot-assisted surgeryComponent positionLower limbs alignment
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