Skip Navigation LinksHome > May 2013 - Volume 45 - Issue 5 > Knee Biomechanics during a Jump-Cut Maneuver: Effects of Se...
Medicine & Science in Sports & Exercise:
doi: 10.1249/MSS.0b013e31827bf0e4
Applied Sciences

Knee Biomechanics during a Jump-Cut Maneuver: Effects of Sex and ACL Surgery

MIRANDA, DANIEL L.1,2; FADALE, PAUL D.1; HULSTYN, MICHAEL J.1; SHALVOY, ROBERT M.1; MACHAN, JASON T.1,3,4; FLEMING, BRADEN C.1,2,5

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Abstract

Purpose: The purpose of this study was to compare kinetic and knee kinematic measurements from male and female anterior cruciate ligament (ACL)–intact (ACLINT) and ACL-reconstructed (ACLREC) subjects during a jump-cut maneuver using biplanar videoradiography.

Methods: Twenty subjects were recruited; 10 ACLINT (5 men and 5 women) and 10 ACLREC (4 men and 6 women, 5 yr postsurgery). Each subject performed a jump-cut maneuver by landing on a single leg and performing a 45° side-step cut. Ground reaction force (GRF) was measured by a force plate and expressed relative to body weight. Six-degree-of-freedom knee kinematics were determined from a biplanar videoradiography system and an optical motion capture system.

Results: ACLINT female subjects landed with a larger peak vertical GRF (P < 0.001) compared with ACLINT male subjects. ACLINT subjects landed with a larger peak vertical GRF (P ≤ 0.036) compared with ACLREC subjects. Regardless of ACL reconstruction status, female subjects underwent less knee flexion angle excursion (P = 0.002) and had an increased average rate of anterior tibial translation (0.05%·ms−1 ± 0.01%·ms−1, P = 0.037) after contact compared with male subjects. Furthermore, ACLREC subjects had a lower rate of anterior tibial translation compared with ACLINT subjects (0.05%·ms−1 ± 0.01%·ms−1, P = 0.035). Finally, no striking differences were observed in other knee motion parameters.

Conclusion: Women permit a smaller amount of knee flexion angle excursion during a jump-cut maneuver, resulting in a larger peak vertical GRF and increased rate of anterior tibial translation. Notably, ACLREC subjects also perform the jump cut maneuver with lower GRF than ACLINT subjects 5 yr postsurgery. This study proposes a causal sequence whereby increased landing stiffness (larger peak vertical GRF combined with less knee flexion angle excursion) leads to an increased rate of anterior tibial translation while performing a jump-cut maneuver.

©2013The American College of Sports Medicine

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