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Bearing surface modeling of the talus and calcaneus

Journal of Foot and Ankle Research
Springer (Biomed Central Ltd.)
Publication Date
DOI: 10.1186/1757-1146-1-s1-o43
  • Oral Presentation
  • Biology
  • Mathematics
  • Medicine

Abstract ral Journal of Foot and Ankle Research ss BioMed Cent Open AcceOral presentation Bearing surface modeling of the talus and calcaneus David Chichka*1, James Stephenson1, Antonio Paulic1 and Frances Sheehan2 Address: 1Mechanical and Aerospace Engineering, The George Washington University, USA and 2National Institute of Health, Washington, DC, USA Email: David Chichka* - [email protected] * Corresponding author Introduction Precise talar in vivo motion is difficult to measure due to its inaccessibility to surface based measures. Thus, most measures of talar motion have been limited to cadaver based measures, typically under static conditions. Quanti- tative measures of the talar bearing surfaces and their abil- ity to mesh with the calcaneal and malleolar bearing surfaces would provide an understanding of the envelope of movements available in both in healthy and patholog- ical joints. Such measures could exploit the availability of 3D non-invasive imaging methodologies, making it avail- able for large-scale healthy and pathological studies. Thus, the purpose of this work is to mathematically model the bearing surfaces of the talar and calcaneal bones in order to determine the allowable motions of a healthy joint. Methods A three-dimensional Faro-arm scanner was used to acquire a dense cloud of points depicting the shape of skeletal bones of a single human foot. The points on the subtalar joint bearing surfaces were then fit with continu- ous functions. The functions were chosen from classes which provide the characteristics expected of the surfaces. The functions were relative to coordinate system defined such that the axes were parallel when the bones were assembled in a "natu- ral" fit, with origin at the saddle point. Initial fits used bi- quadratics. The surface curve fits allowed the evaluation of because it allows an examination of allowable motions of the surfaces relative to each other. For example, very dif- ferent radii of curvature abou

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