Effect Of Morphological Changes Of Femoral Posterior Condyle On Knee Function After TKA Surgery

Objectives:By measuring the parameters related to the posterior femoral condyle before and after total knee arthroplasty,we investigated the effect of changes of posterior condylar offset ratio on knee function.Quantitative grouping was also performed to analyze the range of changes favoring functional recovery of the knee joint and provide a reference basis for decision making on the amount of osteotomy of the posterior femoral condyle during knee arthroplasty.Methods:Clinical data of patients who underwent primary total knee arthroplasty due to knee osteoarthritis in the Department of Bone and Joint Surgery of the First Hospital of Jilin University from January 2019 to January 2022 were retrospectively analyzed.Regular follow-up by phone and outpatient follow-up for 2 months to 12 months.PCOR was calculated by measuring software after Posterior condylar offset(PCO)and Anterior-posterior dimension(ACP)of femoral condylar before and after surgery.According to PCOR change,patients were divided into PCOR change value ≤-0.03 group,-0.03 < PCOR change value< 0 group,0 ≤PCOR change value < 0.03 group,and PCOR change value ≥0.03 group.Grouped into A,B,C and D in order.Before and after surgery,each group underwent statistical analysis of PCO,PCOR,Range of Motion,Knee Society Scores,and Visual Analogous Scores.Results:Significantly lower values of PCO and PCOR were observed in groups A and B than before the operation,whereas group C and D had significantly higher values.These discrepancies were statistically significant(P <0.05).Group C’s ROM was notably higher than that of A,B,and D at 1,3 and 6 months after operation,and the ROM of each group at 2 weeks after operation was significantly lower than that before operation and 1,3 and 6 months after operation(P <0.05).The KSS score of each group at 2 weeks after operation was significantly lower than that before operation and at 1,3 and 6 months after operation(P <0.05).The KSS score at 1 month after operation was significantly higher than before,and operation,and the KSS score at 6 months after operation was significantly higher than that at 3 months after operation(P <0.05).The VAS score of each group at each time point after operation was significantly lower than that before operation(P <0.05).Conclusion:PCOR had no significant effect on the recovery of knee function and pain relief in patients after TKA.When PCOR was increased by 0 to 0.03,patients could achieve range of motion.