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Shelby A. Peel, Lauren E. Schroeder, Zachary A. Sievert, and Joshua T. Weinhandl

1. Olsen OE , Myklebust G , Engebretsen L , Bahr R . Injury mechanisms for anterior cruciate ligament injuries in team handball: a systematic video analysis . Am J Sports Med . 2004 ; 32 ( 4 ): 1002 – 1012 . PubMed ID: 15150050 doi:10.1177/0363546503261724 10

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Kristen M. Stearns-Reider, Rachel K. Straub, and Christopher M. Powers

reducing knee valgus and ACL injury risk. Acknowledgments The authors declare no conflict of interest to disclose. References 1. Toth AP , Cordasco FA . Anterior cruciate ligament injuries in the female athlete . J Gend Specif Med . 2001 ; 4 ( 4 ): 25 – 34 . PubMed ID: 11727468 11727468 2. McLean

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Brian Pietrosimone, Adam S. Lepley, Christopher Kuenze, Matthew S. Harkey, Joseph M. Hart, J. Troy Blackburn, and Grant Norte

. PubMed ID: 25461435 doi:10.1016/j.humov.2014.10.008 10.1016/j.humov.2014.10.008 58. Tengman E , Brax Olofsson L , Stensdotter AK , Nilsson KG , Hager CK . Anterior cruciate ligament injury after more than 20 years. II. Concentric and eccentric knee muscle strength . Scand J Med Sci Sports

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Hidenori Tanikawa, Hideo Matsumoto, Ikki Komiyama, Yoshimori Kiriyama, Yoshiaki Toyama, and Takeo Nagura

It has been suggested that noncontact anterior cruciate ligament injury commonly occurs during sports requiring acute deceleration or landing motion and that female athletes are more likely to sustain the injury than male athletes. The purpose of this study was to make task-to-task and male-female comparisons of knee kinematics and kinetics in several athletic activities. Three-dimensional knee kinematics and kinetics were investigated in 20 recreational athletes (10 males, 10 females) while performing hopping, cutting, turning, and sidestep and running (sharp deceleration associated with a change of direction). Knee kinematics and kinetics were compared among the four athletic tasks and between sexes. Subjects exhibited significantly lower peak flexion angle and higher peak extension moment in hopping compared with other activities (P < .05). In the frontal plane, peak abduction angle and peak adduction moment in cutting, turning, and sidestep and running were significantly greater compared with hopping (P < .05). No differences in knee kinematics and kinetics were apparent between male and female subjects. Recreational athletes exhibited different knee kinematics and kinetics in the four athletic motions, particularly in the sagittal and frontal planes. Male and female subjects demonstrated similar knee motions during the four athletic activities.

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Komeil Dashti Rostami, Aynollah Naderi, and Abbey Thomas

. References 1. Thomas AC , Villwock M , Wojtys EM , Palmieri-Smith RM . Lower extremity muscle strength after anterior cruciate ligament injury and reconstruction . J Athl Train . 2013 ; 48 ( 5 ): 610 – 620 . PubMed ID: 24067150 doi:10.4085/1062-6050-48.3.23 10.4085/1062-6050-48.3.23 24067150 2

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Elena M. D’Argenio, Timothy G. Eckard, Barnett S. Frank, William E. Prentice, and Darin A. Padua

): 311 – 319 . PubMed ID: 17710181 17710181 2. Waldén M , Hägglund M , Werner J , Ekstrand J . The epidemiology of anterior cruciate ligament injury in football (soccer): a review of the literature from a gender-related perspective . Knee Surg Sports Traumatol Arthrosc . 2011 ; 19 ( 1 ): 3

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Cody R. Butler, Kirsten Allen, Lindsay J. DiStefano, and Lindsey K. Lepley

noncontact anterior cruciate ligament injuries . Am J Sports Med . 2006 ; 34 : 1512 – 1532 . PubMed ID: 16905673 doi:10.1177/0363546506286866 10.1177/0363546506286866 16905673 9. Shelbourne KD , Gray T , Haro M . Incidence of subsequent injury to either knee within 5 years after anterior cruciate

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Robson Dias Scoz, Cesar F. Amorim, Bruno O.A. Mazziotti, Rubens A. Da Silva, Edgar R. Vieira, Alexandre D. Lopes, and Ronaldo E.C.D. Gabriel

. Incidence of associated knee lesions with torn anterior cruciate ligament: retrospective cohort assessment . J Sport Rehabil . 1998 ; 7 ( 1 ): 1 – 8 . doi:10.1123/jsr.7.1.1 10.1123/jsr.7.1.1 3. Griffin LY , Agel J , Albohm MJ , et al . Noncontact anterior cruciate ligament injuries: risk factors

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Kevin R. Ford, Christopher A. DiCesare, Gregory D. Myer, and Timothy E. Hewett

Context: Biofeedback training enables an athlete to alter biomechanical and physiological function by receiving biomechanical and physiological data concurrent with or immediately after a task. Objective: To compare the effects of 2 different modes of real-time biofeedback focused on reducing risk factors related to anterior cruciate ligament injury. Design: Randomized crossover study design. Setting: Biomechanics laboratory and sports medicine center. Participants: Female high school soccer players (age 14.8 ± 1.0 y, height 162.6 ± 6.8 cm, mass 55.9 ± 7.0 kg; n = 4). Intervention: A battery of kinetic- or kinematic-based real-time biofeedback during repetitive double-leg squats. Main Outcome Measures: Baseline and posttraining drop vertical jumps were collected to determine if either feedback method improved high injury risk landing mechanics. Results: Maximum knee abduction moment and angle during the landing was significantly decreased after kinetic-focused biofeedback (P = .04). The reduced knee abduction moment during the drop vertical jumps after kinematic-focused biofeedback was not different (P = .2). Maximum knee abduction angle was significantly decreased after kinetic biofeedback (P < .01) but only showed a trend toward reduction after kinematic biofeedback (P = .08). Conclusions: The innovative biofeedback employed in the current study reduced knee abduction load and posture from baseline to posttraining during a drop vertical jump.

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Nicola Marotta, Andrea Demeco, Gerardo de Scorpio, Angelo Indino, Teresa Iona, and Antonio Ammendolia

.1007/s12178-013-9158-y 2. Harmon KG , Ireland ML . Gender differences in noncontact anterior cruciate ligament injuries . Clin Sports Med . 2000 ; 19 ( 2 ): 287 – 302 . PubMed ID: 10740760 doi:10.1016/S0278-5919(05)70204-0 10.1016/S0278-5919(05)70204-0 10740760 3. Griffin LY , Agel J