Honors College Thesis
 

Biomechanical limb asymmetries exist during a 45° sidestep cut among male and female recreational athletes post anterior cruciate ligament construction.

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  • Background: 250,000+ individuals injure an anterior cruciate ligament (ACL) in the United States annually. Individuals post-ACL surgical reconstruction (ACLR) are at elevated risk for ACL re-injury, potentially from kinematic and kinetic asymmetries. While studies have examined asymmetries at the hip and knee post-ACLR during landing, less is known about asymmetries during a sidestep cut. Purpose: To investigate sagittal and frontal plane kinematic and kinetic asymmetries at the hip and knee during a 45° sidestep cut post-ACLR and evaluate ACL re-injury risk. Methods: 19 recreational athletes post-ACLR and return to sport (RTS) performed a bilateral 45° sidestep cut while three-dimensional kinematics (eight camera Vicon motion analysis system, 250 Hz) and ground reaction forces (AMTI, 1500 Hz) were measured. Peak sagittal and frontal plane kinematics and internal joint moments were examined at the hip and knee during the stance phase. Paired t-tests were used to evaluate differences between groups (P ≤ 0.05). Results: Peak hip extension, peak knee flexion, sagittal hip and knee excursion, and knee extensor moment were significantly reduced in the ACLR limb. Conclusion: Participants exhibited altered sagittal plane movement in the ACLR limb that suggests avoidance, potentially due to strength asymmetries, reduced knee proprioception, altered neuromuscular control, or kinesiophobia.
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