Analysis Of Related Anatomical Risk Factors Of Anterior Cruciate Ligament Injury Based On MRI

Background:A number of studies on the anatomical risk factors of anterior cruciate ligament injury(ACL)have been described.However,few studies have systematically analyzed the potential multiple risk factors associated with anterior cruciate ligament injury.Objective:The aim of the present study was to compare the morphometric differences between patients with or without ACL injury,and identify anatomical risk factors associated with ACL injury in active individuals.Methods:The knee joint magnetic resonance images of 100 subjects were included into this study.Data from the ACL-injured group(50 patients)and matched controls(50 subjects)were obtained from the same hospital.These were analyzed by univariable analysis or multivariable conditional logistic regression analysis to examine the effects of the following variables on the risk of suffering ACL injury for the first time: TT-TG distance,medial and lateral tibial slope(MTS and MTS),intercondylar notch width and depth,femur condylar width,lateral femoral condylardepth,notch width index(NWI),notch shape index(NSI),notch depth index(NDI),and cross-sectional area(CSA).Results:In the univariable analysis,the ACL-injured group had a larger TT-TG distance,increased medial and lateral tibial slope,narrower intercondylar notch width,deeper lateral femoral condylar depth,lesser NWI and NSI,and CSA when compared with the control group(P<0.05).However,there were no significant between-group differences in intercondylar notch depth(P=0.174),femur condylar width(P=0.797)and NDI(P=0.436).The multivariable analysis revealed that TT-TG distance(odds ratio [OR]=1.37,95% CI = 1.04-1.81,P=0.028),medial tibial slope(OR=1.30,95% CI = 1.02-1.66,P=0.036)and NWI(OR=0.46,95% CI=0.24-0.91,P=0.025)had significant multivariable associations with the sole independent risk of ACL injury.Conclusion:Larger TT-TG distance,increased MTS and lesser NWI are independent anatomic risk factors for active individuals with ACL injury.