Biomechanical assessment of single-leg drop vertical jump landings : a comparative analysis of first and second landings

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The drop vertical jump is commonly used to assess the biomechanical performance of athletes, both for screening for injury risk and for assessing return-to-play readiness. These assessments rely only on the performance of the first landing and the implications of the second landing have been largely ignored. The second landing, however, better simulates the mechanics of rebounding tasks which are most often associated with greater ACL injury risk. The purpose of this study is to analyze the differences in kinetic and kinematic metrics at the knee joint during the first and second landings of the single-leg drop vertical jump. The results of this study have implications for the future assessment of ACL injury risk and return-to-sport readiness. Greater peak vGRF and knee adduction and smaller knee flexion angle indicate that the second landing of the single-leg drop vertical jump may exhibit greater perturbation and better represents the mechanics associated with ACL injury risk. Moreover, the second landing is a more rigorous task and presents a more challenging evaluation scenario and serves as a more reliable evaluation of risk factors in the sagittal and frontal plane, than the first landing.


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