Volume 5 Supplement 1
Effects of extrinsic foot musculature on hindfoot kinematics during stance phase: Implications for flatfoot pathology
© Burg et al; licensee BioMed Central Ltd. 2012
Published: 10 April 2012
Flatfoot deformity is a common condition, characterized by a collapse of the medial foot arch. Specific muscle dysfunctions relate to kinematic changes of the hind foot (plantarflexion, abduction and valgus) inducing the onset of flatfoot deformity. However, to determine a causal relation between individual muscle action, foot bone motion and flatfoot, in vitro experiments are needed. Our hypothesis states that inducing altered muscle forces in cadaveric feet causes alterations in kinematics, representative for flatfoot deformity [1, 2].
Materials and methods
A gait simulator was used to test seven cadaveric feet. Pneumatic actuators applied forces to the foot tendons, simulating flatfoot related pathologies: contracture of M.Triceps Surae (C-TS) and Mm.Peronei (C-PE); weakness of M.Tibialis Posterior (W-TP) and the pretibial muscles (W-PT); combined contracture of TS and PE (P1) and combined TS contracture with TP weakness (P2). Trajectories of bone-embedded LED clusters were measured during a one second roll-off and resulting ankle, subtalar and talonavicular joint motion was calculated.
At all joint levels, increased motion towards valgus and adduction is seen. Exceptions are subtalar abduction with C-PE and C-TS as well as ankle and subtalar varus for C-PE and P1. More variability is observed for plantar-dorsiflexion: all joints show plantarflexion with C-TS and W-PT, except for subtalar dorsiflexion with W-PT. Dorsiflexion appears with W-TP and C-PE.
This work was funded by the Chair Berghmans-Dereymaeker and the Agency for Innovation by Science and Technology, Flanders.
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This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.