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Journal of Healthcare Engineering
Volume 2018, Article ID 2632603, 8 pages
Research Article

Effect of Dropping Height on the Forces of Lower Extremity Joints and Muscles during Landing: A Musculoskeletal Modeling

1Yangzhi Rehabilitation Hospital, Shanghai Sunshine Rehabilitation Centre, Tongji University School of Medicine, Shanghai 201619, China
2Department of Rehabilitation Sciences, Tongji University School of Medicine, Shanghai 201619, China
3Sport and Health Research Center, Physical Education Department, Tongji University, Shanghai 200092, China
4Department of Biomedical Engineering, The Hong Kong Polytechnic University, Hong Kong

Correspondence should be addressed to Wenxin Niu; nc.ude.ijgnot@uin and Lejun Wang; moc.361@3250jlw

Received 26 July 2017; Revised 18 March 2018; Accepted 10 May 2018; Published 2 July 2018

Academic Editor: John S. Katsanis

Copyright © 2018 Wenxin Niu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The objective of this study was to investigate the effect of dropping height on the forces of joints and muscles in lower extremities during landing. A total of 10 adult subjects were required to landing from three different heights (32 cm, 52 cm, and 72 cm), and the ground reaction force and kinematics of lower extremities were measured. Then, the experimental data were input into the AnyBody Modeling System, in which software the musculoskeletal system of each subject was modeled. The reverse dynamic analysis was done to calculate the joint and muscle forces for each landing trial, and the effect of dropping-landing on the results was evaluated. The computational simulation showed that, with increasing of dropping height, the vertical forces of all the hip, knee, and ankle joints, and the forces of rectus femoris, gluteus maximus, gluteus medius, vastii, biceps femoris and adductor magnus were all significantly increased. The increased dropping height also resulted in earlier activation of the iliopsoas, rectus femoris, gluteus medius, gluteus minimus, and soleus, but latter activation of the tibialis anterior. The quantitative joint and muscle forces can be used as loading conditions in finite element analysis to calculate stress and strain and energy absorption processes in various tissues of the lower limbs.