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Gepubliceerd in: Journal of Foot and Ankle Research 1/2012

Open Access 01-12-2012 | Oral presentation

Effects of extrinsic foot musculature on hindfoot kinematics during stance phase: Implications for flatfoot pathology

Auteurs: Josefien Burg, Koen Peeters, Tassos Natsakis, Jos Vander Sloten, Greta Dereymaeker, Ilse Jonkers

Gepubliceerd in: Journal of Foot and Ankle Research | bijlage 1/2012

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Background

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.

Results

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.

Conclusion

We can confirm the contribution of altered muscle action (either contracture or weakness) to flatfoot development. Our results suggest that largest contribution is present in frontal and sagittal plane, with hindfoot motion towards valgus and plantarflexion. No abduction was seen, suggesting lesser contribution of these pathologies in the transverse plane. This study contributes to fundamental knowledge on foot biomechanics in normal as well as pathological foot function and establishes the causal relation between modified muscle action and flatfoot deformity.

Acknowledgements

This work was funded by the Chair Berghmans-Dereymaeker and the Agency for Innovation by Science and Technology, Flanders.
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.
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Literatuur
1.
go back to reference Wülker N, Hurschler C, Emmerich J: In vitro simulation of stance phase gait part II: simulated anterior tibial tendon dysfunction and potential compensation. Foot Ankle Int. 2003, 24: 623-629. PubMed Wülker N, Hurschler C, Emmerich J: In vitro simulation of stance phase gait part II: simulated anterior tibial tendon dysfunction and potential compensation. Foot Ankle Int. 2003, 24: 623-629. PubMed
2.
go back to reference Ness MA, Long J, Marks R, Harris G: Foot and ankle kinematics in patients with posterior tibial tendon dysfunction. Gait Posture. 2008, 27: 331-339. 10.1016/j.gaitpost.2007.04.014. CrossRefPubMed Ness MA, Long J, Marks R, Harris G: Foot and ankle kinematics in patients with posterior tibial tendon dysfunction. Gait Posture. 2008, 27: 331-339. 10.1016/j.gaitpost.2007.04.014. CrossRefPubMed
Metagegevens
Titel
Effects of extrinsic foot musculature on hindfoot kinematics during stance phase: Implications for flatfoot pathology
Auteurs
Josefien Burg
Koen Peeters
Tassos Natsakis
Jos Vander Sloten
Greta Dereymaeker
Ilse Jonkers
Publicatiedatum
01-12-2012
Uitgeverij
BioMed Central
Gepubliceerd in
Journal of Foot and Ankle Research / Uitgave bijlage 1/2012
Elektronisch ISSN: 1757-1146
DOI
https://doi.org/10.1186/1757-1146-5-S1-O49