Kinematics and Kinetics Predictor of Proximal Tibia Anterior Shear Force during Single Leg Drop Landing

purpose: the purpose of this study was to investigate the kinematic and kinetic variables, whichpredict anterior tibia shear force during single-leg landing in female athletes. methods: forty-three subjects (mean and standard deviation for age 21.12 ± 2.00 y, height168.58 ± 7.62 cm, and weight 60.27 ± 7.80 kg) participated in this study. kinematic and kineticvariables of lower extremity and trunk during single-leg landing were collected by 5 viconcameras and kistler force plate. stepwise multiple regression and pearson correlation were usedto identify predictor variables of anterior shear force (p ≤ 0.05). results: peak of extensor moment (p = 0.004, r = -0.394) and maximum knee flexion (p =0.007, r = -0.370) were the best predictors that explained 30% of the variance of the shear forcedata. therefore, rise in maximum extensors moment of knee and knee maximum flexion causesincrease and decrease in anterior shear force, respectively. in addition, a significant relationshipbetween trunk flexion (p = 0.039) and knee flexion angular velocity (p = 0.048) at the moment ofinitial contact with the anterior shear force. conclusion: on the basis of previous research, and the relationship between clinical findings,the noncontact of anterior cruciate ligament injury during landing was confirmed. these resultscan be used in prospective studies examining modifiable noncontact risk factors of acl injury.