en آسیب شناسی ورزشی و حرکات اصلاحی Sport injury and corrective exercises پژوهشي Research <b>Purpose:</b> The purpose of this study was to investigate the kinematic and kinetic variables, which predict anterior tibia shear force during single-leg landing in female athletes.&nbsp; <div><b>Methods:</b> Forty-three subjects (mean and standard deviation for age 21.12 &plusmn; 2.00 y, height 168.58 &plusmn; 7.62 cm, and weight 60.27 &plusmn; 7.80 kg) participated in this study. Kinematic and kinetic variables of lower extremity and trunk during single-leg landing were collected by 5 Vicon cameras and Kistler force plate. Stepwise multiple regression and Pearson correlation were used to identify predictor variables of anterior shear force (P &le; 0.05).&nbsp;</div> <div><b>Results:</b> 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 force data. Therefore, rise in maximum extensors moment of knee and knee maximum flexion causes increase and decrease in anterior shear force, respectively. In addition, a significant relationship between trunk flexion (P = 0.039) and knee flexion angular velocity (P = 0.048) at the moment of initial contact with the anterior shear force.&nbsp;</div> <div><b>Conclusion:</b> On the basis of previous research, and the relationship between clinical findings, the noncontact of anterior cruciate ligament injury during landing was confirmed. These results can be used in prospective studies examining modifiable noncontact risk factors of ACL injury.</div> Proximal Tibia Anterior Shear Force, Single Leg Drop Landing, Kinematic and Kinetic Variables, Female Athletes 102 108 http://ptj.uswr.ac.ir/browse.php?a_code=A-10-166-1&slc_lang=en&sid=1 Naghmeh Gheidi نغمه قیدی Gheidi.n1981@gmail.com Yes PhD Candidate in Sports Biomechanics, Faculty of Physical Education and Sport Sciences, Kharazmi University, Tehran, Iran دانشگاه خوارزمی Heydar Sadeghi حیدر صادقی No faculty of physical education and sport sciences, Kharazmi University دانشگاه خوارزمی Saeed Talebian Moghadam سعید طالبیان مقدم No Tehran University of Medical Science دانشگاه علوم پزشکی تهران Farhad Tabatabaei Ghoshe فرهاد طباطبایی قمشه ای No University of Social Welfare and Rehabilitation Sciences دانشگاه علوم بهزیستی و توانبخشی Thomas Walter Kernozek No