Abstract
The effect of modeling the knee as a simple spherical or revolute joint during gait, cutting and hopping were evaluated. The results indicate that, even during gait, a revolute joint may be too restrictive in its representation of the knee, with flexion/extension errors as high as 9.4°. By imposing the spherical joint, joint angles showed consistent and strong correlations with the true joint angles for the functional tasks, although internal/external rotation angle were moderately affected (errors up to 4.2°). For both constraint types, the remaining Degrees of Freedom (DOF) were not consistent across subjects and must be considered unreliable, with translation errors of up to 11.0 mm with a spherical joint and 11.9 with a revolute joint.
In conclusion, the results of this study suggest that inclusion of a spherical joint produced reliable results only for joint angles, yet significant bone translations were eliminated from the recovered motion. Furthermore, the constraints imposed flexion/extension errors of up to 4.4° with a spherical joint (observed during hopping) and 9.4° with a revolute joint (observed during gait). Although the joint DOF errors are generally smaller than those associated with soft tissue artefacts, they may still contribute to a significant source of error in the models when used.
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© 2010 International Federation for Medical and Biological Engineering
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Andersen, M.S., Rasmussen, J., Ramsey, D.K., Benoit, D.L. (2010). Validation of Knee Joint Models – An In Vivo Study. In: Lim, C.T., Goh, J.C.H. (eds) 6th World Congress of Biomechanics (WCB 2010). August 1-6, 2010 Singapore. IFMBE Proceedings, vol 31. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-14515-5_327
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DOI: https://doi.org/10.1007/978-3-642-14515-5_327
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-14514-8
Online ISBN: 978-3-642-14515-5
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