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A Numerical Model of the Human Ankle/Foot under Impact Loading in Inversion and Eversion
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Abstract
Since numerous years, the vehicle industry is interested in occupant safety. The dummy use in crash tests allowed to create protective means like the belt and the airbag that diminished the injuries of the head and the thorax, which are often lethal for the car occupant. An other objective appears now: to improve the car safety to avoid the injuries which are not fatal but which can cause disability and which cause great cost in hospitalization and rehabilitation. The lower extremity protection, in particular the one of the ankle and the foot region, has become the subject of diverse research efforts by its high percentage of injuries in car crashes. But the dummy mechanics cannot reproduce the accurate ankle and the foot kinematics during an impact loading like in vehicle crash. Therefore, ankle/foot complex numerical models are an essential tool for the car safety improvement.
The simulation of the ankle dorsiflexion response during an impact loading was presented in a first paper ([1]). The influence of a few parameters of the biological components modeling was studied in a second paper ([2]).
The present paper presents the simulation of the other principal movements in car crash: the inversion and the eversion. In order to validate the ankle/foot model, the experimental tests of Professor Begeman presented in [6] are chosen. At first, the ankle/foot model with rigid bones is validated at different levels of energy. The gross kinematics of the model is correlated with the experimental tests. At a local level, the main relative motions of the bones during the inversion and the eversion were found in the simulation.
For inversion, the paper also compares the calculated forces and moments at the point of fixation at mid-length of the leg with test results, the quality of which indicates future directions of improvements of the model.
The future work will validate the model with deformable bones in the case of inversion and eversion. Both models will be validated also in static cases.
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Beaugonin, M., Haug, E., and Cesari, D., "A Numerical Model of the Human Ankle/Foot under Impact Loading in Inversion and Eversion," SAE Technical Paper 962428, 1996, https://doi.org/10.4271/962428.Also In
References
- Beaugonin, M. Haug, E. Munck, G. Cesari, D. “A Preliminary Numerical Model of the Human Ankle under Impact Loading” PLEI Conference Washington, D. C., USA 1995
- Beaugonin, M. Haug, E. Munck, G. Cesari, D. “The Influence of some Critical Parameters on the Simulation of the Dynamic Human Ankle Dorsiflexion Response” 15th ESV Conference Melbourne, AUSTRALIA May 13-17 1996
- Morgan, R. M. Eppinger, R; H. Hennessey, B. “Ankle Joint Injury Mechanism for Adults in Frontal Automotive Impact” 35th Stapp Car Crash Conference Proceedings 1991 SAE 912902
- Portier, L. Troseille, X. Le Coz, J.-Y. Lavaste, F. Coltat, J.-C. “Lower Leg Injuries in Real-world Frontal Accidents” Proceedings of the 28th International IRCOBI Conference on the Biomechanics of Trauma September 1993 57 78
- Lestina, D. C. Kuhlmann, T. P. Keats, T. E. Maxwell Alley, R. “Mechanism of Fracture in Ankle and Foot Injuries to Drivers in Motor Vehicle” 36th Stapp Car Crash Conference Proceedings 1992 SAE 922515
- Begeman, P. Balakrishnan, P. Levine, R. King, A. “Dynamic Human Ankle Response to Inversion and Eversion” 37th Stapp Car Crash Conference Proceedings 1993 SAE 933115
- Begeman; P. Wayne State University Detroit, Michigan June 1995
- Yamada, H. Evans, F. G “ Strength of Biological Materials ” The Williams& Wilkins Company Baltimore 1970