Abstract
Use of subject-specific axes of rotation may improve predictions generated by kinematic models, especially for joints with complex anatomy, such as the tibiotalar and subtalar joints of the ankle. The objective of this study was twofold. First, we compared the axes of rotation between generic and subject-specific ankle models for ten control subjects. Second, we quantified the accuracy of generic and subject-specific models for predicting tibiotalar and subtalar joint motion during level walking using inverse kinematics. Here, tibiotalar and subtalar joint kinematics measured in vivo by dual-fluoroscopy served as the reference standard. The generic model was based on a cadaver study, while the subject-specific models were derived from each subject’s talus reconstructed from computed tomography images. The subject-specific and generic axes of rotation were significantly different. The average angle between the modeled axes was 12.9° ± 4.3° and 24.4° ± 5.9° at the tibiotalar and subtalar joints, respectively. However, predictions from both models did not agree well with dynamic dual-fluoroscopy data, where errors ranged from 1.0° to 8.9° and 0.6° to 7.6° for the generic and subject-specific models, respectively. Our results suggest that methods that rely on talar morphology to define subject-specific axes may be inadequate for accurately predicting tibiotalar and subtalar joint kinematics.
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Acknowledgments
This work was supported by grants from the National Institutes of Health (R21 AR069773, R21 AR063844, S10 RR026565, F32 AR067075), the LS-Peery Discovery Program in Musculoskeletal Restoration, the American Orthopaedic Foot & Ankle Society, and the Orthopaedic Research and Education Foundation with funding from the Orthopaedic Research Society. The content is solely the responsibility of the authors and does not necessarily represent the official views of these funding sources. We thank K. Bo Foreman, Justine Goebel, Ashley Kapron, Bibo Wang, and Austin West for assistance collecting and processing the experimental data. We also thank Greg Stoddard for feedback regarding our statistical analyses as well as Glen Litchwark and Tim Dorn for their open-source OpenSim toolboxes, which were adapted to facilitate batch processing of our computer simulations.
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The corresponding author and co-authors do not have a conflict of interest, financial or otherwise, that would inappropriately influence or bias the research reported herein.
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Associate Editor Michael R. Torry oversaw the review of this article.
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Nichols, J.A., Roach, K.E., Fiorentino, N.M. et al. Subject-Specific Axes of Rotation Based on Talar Morphology Do Not Improve Predictions of Tibiotalar and Subtalar Joint Kinematics. Ann Biomed Eng 45, 2109–2121 (2017). https://doi.org/10.1007/s10439-017-1874-9
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DOI: https://doi.org/10.1007/s10439-017-1874-9