Can the Single-Leg Hop Distinguish Between ACL Reconstructed Individuals and Controls
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Anterior cruciate ligament (ACL) injuries are common orthopedic injuries (Sanders et al., 2016). Following reconstruction of the ACL a patient must be medically cleared before returning to full participation in sport or activities. The single-leg hop for distance test is one that is used to help determine a patient’s readiness to return to sport. A patient will pass this test if they achieve ≥90% symmetry in distance jumped with each leg, although this does not always mean that the limbs are working in the same way to achieve this symmetrical distance. Therefore, this study hoped to find other measures that could be added to strengthen the single-leg hop for distance test. Kinematic and kinetic data were collected on 24 control participants and 6 ACL reconstructed (ACLR) participants as they performed the single-leg hop for distance test. Participants were asked to jump as far as they could, taking-off from one foot and landing on two. Hop distances were measured to calculate the hop distance limb symmetry index (LSI). Joint angular velocity and joint power were calculated at the hip, knee and ankle, but only the take-off portion of the hop was used for statistical analyses. A logistic regression was performed to predict participant group membership using knee joint power. All controls and ACLR participants achieved a 90% hop distance LSI. Although all participants achieved ≥90% LSI, not all participants were symmetrical across all joints. Two participants, 1 ACLR and 1 control had knee power correlations less than 0.4, and even though their power correlation scores were low, their joint angular velocity correlations were higher. The logistic regression classified 1 control and 1 ACLR as ACLRs, while everyone else was classified as a control, although it was not significant.