Print Email Facebook Twitter The influence of foot geometry on the calcaneal osteotomy angle based on two-dimensional static force analyses Title The influence of foot geometry on the calcaneal osteotomy angle based on two-dimensional static force analyses Author Reilingh, M.L. Tuijthof, G.J.M. Van Dijk, C.N. Blankevoort, L. Faculty Mechanical, Maritime and Materials Engineering Department Biomechanical Engineering Date 2011-06-14 Abstract Background: Malalignment of the hindfoot can be corrected with a calcaneal osteotomy (CO). A well-selected osteotomy angle in the sagittal plane will reduce the shear force in the osteotomy plane while walking. The purpose was to determine the presence of a relationship between the foot geometry and loading of the calcaneus, which influences the choice of the preferred CO angle. Methods A static free body force analysis was made of the posterior calcaneal fragment in the second half of the stance phase to determine the main loads: the plantar apeunorosis (PA) and Achilles tendon (AT). The third load is on the osteotomy surface which should be oriented such that the shear component of the force is zero. The force direction of the PA and AT was measured on 58 MRIs of the foot, and the force ratio between both structures was taken from the literature. In addition the PA-to-AT force ratio was estimated for different foot geometries to identify the relationship. Results: Based on the wish to minimize the shear force during walking, a mean CO angle was determined to be 33º (SD8) relative to the foot sole. In pes planus foot geometry, the angle should be higher than the mean. In pes cavus foot geometry, the angle should be smaller. Conclusion: Foot geometry, in particular the relative foot heights is a determinant for the individual angle in performing the sliding calcaneal osteotomy. It is recommended to take into account the foot geometry (arch) when deciding on the CO angle for hindfoot correction. Subject calcaneal osteotomyachilles tendonplantar apeunorosisforce analysisfoot model To reference this document use: http://resolver.tudelft.nl/uuid:7796c1b5-f7c3-4e86-8070-fb2ffc681ea7 DOI https://doi.org/10.1007/s00402-011-1337-y Publisher Springer Verlag ISSN 1434-3916 Source Archives of Orthopaedic and Trauma Surgery, 2011 Part of collection Institutional Repository Document type journal article Rights (c) 2011 The Author(s). This article is published with open access at Springerlink.com Files PDF reilingh2011.pdf 492.84 KB Close viewer /islandora/object/uuid:7796c1b5-f7c3-4e86-8070-fb2ffc681ea7/datastream/OBJ/view