Honors College Thesis
 

Comparison of Joint Moments and Joint Contributions to Total Support Moment during the Propulsive Phase of a Triple Hop Task between Healthy and ACL Reconstructed Females

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  • Recent research suggests that individuals might use compensatory movement patterns in their ACL-reconstructed (ACLR) limb when performing a triple hop (TH) to overcome quadriceps weakness. The purpose of this study was to determine if ACLR females exhibit differences in TH performance compared to previously uninjured females. Nineteen females with ACLR and 19 without completed three THs during which hop distance was recorded and lower extremity biomechanics assessed. Hip, knee, and ankle joint extensor moment impulses, total support moment impulse (TSM), and joint contributions to TSM during the propulsive phase of the first hop were calculated and the influences of previous ACL injury, joint, and their interaction on the outcome variables was assessed. Previous history of ACLR did not influence hop performance, TSM, or individual joint impulse magnitudes or contributions to TSM. However, irrespective of group, the ankle, rather than the knee, produced the greatest joint moment impulse and was the largest contributor to TSM. This suggests that the previously reported lack of association between quadriceps function and single leg TH performance is not the result of compensatory strategies following ACLR, but most likely results from the ankle and not the knee being the primary contributor to propulsion.
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