The sidestep cutting manoeuvre requires exertion of lumbosacral lateral flexion torque to avoid excessive pelvic obliquity.
During sidestep cutting, the pelvis is supported only on one side; this affects the athlete's posture. This study investigated the mechanism to avoid excessive pelvic obliquity during sidestep cutting. Ten physically active men performed sidestep cutting with maximal effort, and we captured the kinematics and kinetics with force platforms and an eight-camera motion capture system. Our results indicated that the stance hip exerted little abduction torque; however, lumbosacral lateral flexion torque was exerted towards the free-leg side (peak value: 3.39 ± 0.91 N m/kg). Although bilateral hip joint forces acted to drop the free-leg side of the pelvis, the net torque around pelvic elevation/drop axis was nearly zero during the entire stance phase and the change in the angular momentum around the pelvic elevation/drop axis from touchdown to toe-off was negligible (-0.004 ± 0.003 N m s/kg). The integrated components of lateral flexor for elevating the free-leg side of the pelvis (0.220 ± 0.072 N m s/kg) were significantly larger than any other integrated components, which were all negligible (<0.010 N m s/kg). Thus, sidestep cutting requires the lumbosacral lateral flexion torque exertion to neutralise the passive action that drops the free-leg side of the pelvis.
['Sado|Natsuki|N|http://orcid.org/0000-0002-3958-8193', 'Yoshioka|Shinsuke|S|', 'Fukashiro|Senshi|S|']
D000328:Adult D001696:Biomechanical Phenomena D006615:Hip D006801:Humans D007866:Leg D008161:Lumbosacral Region D008297:Male D009048:Motor Skills D009068:Movement D010388:Pelvis D011187:Posture D012399:Rotation D013177:Sports D013996:Time and Motion Studies D019415:Torque D055815:Young Adult
Change of direction L5/S1 inverse dynamics pelvic drop turn