Brian L.
Zeller, PhD, ATC Jean L.
McCrory, PhD John W.
Hall, PhD Robert
Shapiro, PhD ABSTRACT The incidence and risk factors involved with noncontact anterior cruciate ligament (ACL) injuries have been extensively researched over the last 5 to 10 years. Research has concentrated on the identification and clinical assessment of potential risk factors that may lead to an athlete sustaining an ACL injury. These proposed risk factors are commonly placed into two categories: extrinsic or intrinsic. Extrinsic factors have been referred to as those factors that are potentially controllable or changeable. Common extrinsic factors discussed include conditioning levels, body movement and positioning, muscular strength and neuromuscular coordination, and shoe wear/shoe-surface interface. Intrinsic factors have been described as factors that are more gender-specific and less likely to be adapted. Common intrinsic factors include joint laxity, limb alignment, intercondylar notch size and shape, ligament size and strength, hormonal levels, and foot abnormalities. This article reviews the relevant literature in these areas in order to provide an overall understanding of the current research and to better assist the clinician in the prevention of ACL injuries.
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