Objective To investigate the predictive value of MRI findings in the knee joint for return-to-sports after recurrent patellar dislocation(RPD)surgery.Methods A total of 95 RPD patients were divided into return-to-sports group(n=60)and non-return-to-sports group(n=35)based on the Tegner activity score at 1 year postoperatively.The MRI findings and sports-related scores were compared between groups at different postoperative timepoints,along with their correlations.The relationship between MRI findings changes and postoprative return-to-sports was analyzed.Results Compared with the return-to-sports group,the non-return-to-sports group exhibited significantly greater patellar tilt angle(PTA),tibial tuberosity-trochlear groove(TTTG),congruence angle(CA)and lateral patellar displacement(LPD),while demonstrating lower Wiberg index,lateral patellofemoral angle(LPA),Kujala and Lysholm scores at different postoperative timepoints(P<0.05).Multivariate linear regression and logistic regression analyses showed that Kujala and Lysholm scores at different postoperative timepoints were negatively correlated with ΔPTA,ΔCA,ΔTTTG and ΔLPD,but positively correlated with ΔWiberg index and ΔLPA(P<0.05).The results of Cox regression analysis showed after further adjusting the influence of other factors,the trends test of MRI finding changes was still statistically significant(P<0.05).The receiver operating characteristic(ROC)curves analysis showed that predictive utility for individual and combined MRI parameter changes,with optimal performance for combined metrics.The restricted cubic spline analysis showed that ΔPTA,ΔCA,ΔTTTG,ΔLPD were negatively correlated with return-to-sports,while ΔWiberg index and ΔLPA were positively correlated with return-to-sports.Conclusion Postoperative knee MRI findings in RPD patients provide clinically relevant guidance for predicting return-to-sports.Decreases in PTA,CA,TTTG,and LPD,coupled with increases in Wiberg index and LPA,correlate with higher likelihood of return-to-sports.

Objective To investigate the predictive value of MRI findings in the knee joint for return-to-sports after recurrent patellar dislocation(RPD)surgery.Methods A total of 95 RPD patients were divided into return-to-sports group(n=60)and non-return-to-sports group(n=35)based on the Tegner activity score at 1 year postoperatively.The MRI findings and sports-related scores were compared between groups at different postoperative timepoints,along with their correlations.The relationship between MRI findings changes and postoprative return-to-sports was analyzed.Results Compared with the return-to-sports group,the non-return-to-sports group exhibited significantly greater patellar tilt angle(PTA),tibial tuberosity-trochlear groove(TTTG),congruence angle(CA)and lateral patellar displacement(LPD),while demonstrating lower Wiberg index,lateral patellofemoral angle(LPA),Kujala and Lysholm scores at different postoperative timepoints(P<0.05).Multivariate linear regression and logistic regression analyses showed that Kujala and Lysholm scores at different postoperative timepoints were negatively correlated with ΔPTA,ΔCA,ΔTTTG and ΔLPD,but positively correlated with ΔWiberg index and ΔLPA(P<0.05).The results of Cox regression analysis showed after further adjusting the influence of other factors,the trends test of MRI finding changes was still statistically significant(P<0.05).The receiver operating characteristic(ROC)curves analysis showed that predictive utility for individual and combined MRI parameter changes,with optimal performance for combined metrics.The restricted cubic spline analysis showed that ΔPTA,ΔCA,ΔTTTG,ΔLPD were negatively correlated with return-to-sports,while ΔWiberg index and ΔLPA were positively correlated with return-to-sports.Conclusion Postoperative knee MRI findings in RPD patients provide clinically relevant guidance for predicting return-to-sports.Decreases in PTA,CA,TTTG,and LPD,coupled with increases in Wiberg index and LPA,correlate with higher likelihood of return-to-sports.