The effects of three jump landing tasks on kinetic and kinematic measures: implications for ACL injury research.
This study compared the biomechanics of jump landing tasks used in ACL research. Twenty-seven female subjects performed a drop landing (DL), a drop landing with a vertical jump (DVJ), and a forward jump landing with a vertical jump (FVJ). We hypothesized that as one progressed from the drop landing through the forward-vertical jump that the kinematic and kinetic demands would increase, with progressively increasing knee and hip forces, moments, and angles on landing. Separate repeated-measures ANOVAs were performed. The FVJ had the highest peak anterior tibial shear force (p < 0.001), hip flexion angle (p < 0.001), knee flexion moment (p < 0.001), and knee valgus moment (p < 0.001). The DL had the smallest knee flexion angle (p = 0.001) and hip flexion angle (p < 0.001), while the DVJ had the lowest knee valgus moment (p < 0.001). These results indicate that seemingly minor variations between jump landing tasks may influence landing biomechanics. Caution should be used when comparing studies using different tasks.
a Physical Medicine and Rehabilitation , Emory University , Atlanta , Georgia , USA.
Anna
A
Cruz
David
D
Bell
Melanie
M
McGrath
Troy
T
Blackburn
Darin
D
Padua
Daniel
D
Herman
D000704:Analysis of Variance; D016118:Anterior Cruciate Ligament / Q000503:physiopathology; D000070598:Anterior Cruciate Ligament Injuries; D001696:Biomechanical Phenomena; D005260:Female; D006621:Hip Joint / Q000502:physiology; D006801:Humans; D007700:Kinetics; D007718:Knee Injuries / Q000503:physiopathology* / Q000517:prevention & control*; D007719:Knee Joint / Q000502:physiology; D035002:Lower Extremity / Q000502:physiology*; D009068:Movement / Q000502:physiology*; D055815:Young Adult