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Emily R. Hunt, Cassandra N. Parise and Timothy A. Butterfield

Clinical Scenario Anterior cruciate ligament (ACL) injuries are among the most common traumatic athletic injuries, affecting upwards of 200,000 individuals per year in the United States. 1 For those US patients who wish to continue participation in competitive athletics, ligament reconstruction

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Megan P. Brady and Windee Weiss

Clinical Scenario A common injury among elite, recreational, and youth athletes is the anterior cruciate ligament (ACL) tear. 1 Approximately 200,000 ACL injuries occur every year. 2 The gold standard in ACL injury evaluation is diagnostic arthroscopy 3 , 4 ; however, the diagnostic accuracy of

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Jonathon R. Staples, Kevin A. Schafer, Matthew V. Smith, John Motley, Mark Halstead, Andrew Blackman, Amanda Haas, Karen Steger-May, Matthew J. Matava, Rick W. Wright and Robert H. Brophy

The anterior cruciate ligament (ACL) is a commonly injured ligament in the body, often but not always requiring operative intervention. 1 The incidence of ACL reconstruction continues to rise, increasing by 20% over the last decade, with the most rapid increase occurring in patients aged between

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Joseph Hannon, J. Craig Garrison, Sharon Wang-Price, Shiho Goto, Angellyn Grondin, James Bothwell and Curtis Bush

Joint loading following anterior cruciate ligament reconstruction (ACL-R) continues to be a topic of interest among researchers, because altered joint loading can contribute to compensatory movements, commonly seen in this patient population. Joint loading has been examined using a variety of

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Steven H. Ryder, Robert J. Johnson, Bruce D. Beynnon and Carl F. Ettlinger

Athletes are particularly at risk for anterior cruciate ligament injury, and there is some evidence that female athletes are more at risk than males. The conflicting principles of stability and mobility are at odds within the knee, setting the stage for potentially serious injuries. Some investigators suggest that the size of the intercondylar notch should be used to identify athletes at risk for ACL damage, but more research is required before clinical decisions can be based on notch width measurements. Athletic shoe modifications and artificial playing surfaces may influence the incidence of ACL injures. Functional knee braces appear to have beneficial strain shielding effect on the ACL for anterior directed loads and internal–external torques applied to the tibia, but this effect appears to decrease as the magnitude of these anterior directed loads and torques increases. Ski equipment is often pointed to as a contributing factor in ACL injuries, but there is no evidence that modifications in ski equipment will decrease ACL disruptions. An education program based on recognizing the events that lead to ACL injury in skiing may reduce knee injuries in the future.

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Nathaniel A. Bates, Nathan D. Schilaty, Ryo Ueno and Timothy E. Hewett

Clinically, anterior cruciate ligament (ACL) injuries are hypothesized to occur within 50 milliseconds of initial contact with the ground during landing tasks. 1 This rapid loading of the ACL is corroborated by in vitro simulation, which has shown that ACL strain immediately increases and peaks

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Ryan Zerega, Carolyn Killelea, Justin Losciale, Mallory Faherty and Timothy Sell

Unintentional lower-extremity musculoskeletal injuries are among the most prevalent in sports 1 and often result in significant time loss from competition. 2 One common lower-extremity injury is a rupture of the anterior cruciate ligament (ACL), with an estimated 80,000 to over 250,000 occurring

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Grant E. Norte, Katherine R. Knaus, Chris Kuenze, Geoffrey G. Handsfield, Craig H. Meyer, Silvia S. Blemker and Joseph M. Hart

Anterior cruciate ligament (ACL) injuries continue to constitute a common major joint injury among active individuals, often resulting in high economic costs, 1 reduced physical activity, 2 and decreased quality of life. 2 An estimated range of 80,000 to more than 250,000 ACL injuries are

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Grant E. Norte, Jay N. Hertel, Susan A. Saliba, David R. Diduch and Joseph M. Hart

Clinical outcomes following anterior cruciate ligament reconstruction (ACL-R) are often evaluated based on impairment and patient-reported function. The use of clinically meaningful tests is an important aspect of return to activity decision making following ACL-R. Information from a variety of

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Dawn T. Gulick

The prevalence of knee disorders is estimated at more than 50% in a lifetime. 1 , 2 There are approximately 250,000 to 300,000 anterior cruciate ligament (ACL) injuries per year in the United States. 2 , 3 There are over 175,000 reconstructions annually. 2 , 3 Athletes involved in high