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Effect of external loading on in vitro measured muscle induced calcanear and talar motion

Journal of Foot and Ankle Research
Springer (Biomed Central Ltd.)
Publication Date
DOI: 10.1186/1757-1146-1-s1-o48
  • Oral Presentation
  • Physics

Abstract BioMed Central Page 1 of 2 (page number not for citation purposes) Journal of Foot and Ankle Research Open AccessOral presentation Effect of external loading on in vitro measured muscle induced calcanear and talar motion Ilse Jonkers*1,2, Koen Peeters2, Joris Walraevens2, Georges Van der Perre2, Greta Dereymaeker2,3, Jos Vander Sloten2 and Pieter Spaepen2 Address: 1FABER, K.U. Leuven, Leuven, Belgium, 2Division of Biomechanics and Engineering Design (BMGO), K.U. Leuven, Leuven, Belgium and 3Dep. of Orthopedics, H. Hart Ziekenhuis, Leuven, Belgium Email: Ilse Jonkers* - [email protected] * Corresponding author Introduction Several foot deformities (e.g. pes planus, pes cavus) result from muscular force imbalance across the joints of the ankle and foot. The use of in vitro measurements is required to explore the causal relation between muscle forces, individual foot bone movement and resulting foot deformities. This study quantified the effect of muscle action of the pretibial muscle groups, Mm. peronei as well as the Gastro-soleus on the three dimensional rotation of calcaneus and talus using in vitro measurements with a gait simulator consisting of pneumatic actuators. Further- more, we tested the effect of altered load bearing condi- tions of the foot on the observed relations. Methods Pneumatic actuators exerted forces with increasing magni- tude onto the tendons of the pretibial muscles (M. tibialis anterior, M. extensor hallucis and M. extensor digitorum longus), the tendons of both M. peronei and the Achilles tendon of a cadaver foot, placed in an anatomical position (neutral, upright standing). The resulting motion of bone embedded LEDs was tracked using an opto-electronic sys- tem (Krypton, Metris) and the resulting three-dimen- sional rotation of calcaneus and talus was quantified. Changes in ground reaction forces were measured using a Kistler force platform. These tests were repeated for load- ing of the foot of 0 N, 150 N

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