Graduate Thesis Or Dissertation
 

The Influence of Hip Abduction, Extension, and External Rotation Rate of Torque Development on Frontal-Plane Biomechanics during Single-Leg Jump-Cuts

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  • Anterior cruciate ligament injuries are relatively common in female athletes with greater frontal plane knee motion and loading during a landing task predictive of injury. As a result, decreasing knee abduction motion and loading is important for ACL injury prevention. While increased strength of the hip abductors, extensors, and external rotators has been commonly theorized to improve eccentric control of hip adduction and internal rotation, and thus decrease frontal plane knee motion and loading, previous work evaluating the relationship between peak torque of these muscle groups and frontal plane biomechanics is equivocal. However, as the time to generate peak torque exceeds the time during which frontal plane motion occurs during movement tasks, the capacity to rapidly develop torque may be more closely related to frontal plane biomechanics. Therefore, the objective of this study was to examine the influence of hip abduction, extension, and external rotation rate of torque development (RTD) and frontal-plane hip and knee biomechanics. Forty recreationally active females performed maximal isometric contractions and single-leg jump-cuts. From recorded torque, motion capture, and ground reaction force data, hip RTD and frontal plane hip and knee biomechanics were calculated. For each RTD measure, jump-cut biomechanics were compared between participants in the highest (High) and lowest (Low) tertiles. No differences in frontal plane biomechanics were identified between High and Low hip abduction RTD groups. However, those in the High hip extension or High external rotation RTD groups had lesser hip adduction and knee abduction displacements. The results suggest that in movements such as cutting in which the hip is abducted and flexed, the ability of the gluteus medius to control frontal plane motion is likely reduced due to the position of the hip, but that the upper portion of the gluteus maximus might control frontal plane hip motion by functioning as a hip abductor. The results highlight an important role the gluteus maximus may play in controlling frontal plane hip and knee motion during cutting tasks.
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