arakilo_2008_joint forces within the ankle during level walking.pdf

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arakilo_2008_joint forces within the ankle during level walking.pdf

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arakilo_2008_joint forces within the ankle during level walking

Joint Forces within The Ankle During Level Walking. Mike Arakilo, University of Dundee. October 2, 2008 Abstract. Total Ankle Replacement (TAR) has been shown to lack the long term reliability of other implants. Many efforts have been made to im- prove the design. These have included simply exploiting more anatomically shaped prosthesis; however understanding the fundamental mechanics of the joint based upon robust experimental data is perhaps a more promising ap- proach. Current data describing ankle joint forces have been calculated based on questionable assumptions from a very limited number of investigations dating back to the 1970s. The purpose of this study is to develop a more sophisticated computer simulation of the ankle joint to provide data more reliable than that currently exist. The foot has been modelled as a rigid segment while the ankle is modelled as two independent revolute joints: one for the ankle and one for the subtalar joint. Plantar flexion originates from the Achilles tendon forces which are determined completely by the ground reaction force and they are largely statically determinate in AnyBody Technology simulation software. Gait data were collected with a custom model marker placement set with 1 extra markers on the medial ankle, 1st and 5th metatarsals. Data were then processed in the AnyBody Technology simulation software to investigate the reaction forces within the ankle joint. Forces acting on the Achilles tendon as well as forces from the tibialis anterior, tibialis posterior and pereonus muscles were also determined. There was a good agreement between the forces predicted by the model and force data reported from studies using other methodologies. Forces pre- dicted by our simulation could now be used in FEM studies to investigate pressure and stress on the ankle prosthesis and provide better understanding of the reasons why these prostheses are so prone to failure. 2 ANSYS Conference 26th CADFEM Users Meeting 2008 October 22-24,