Abstract
Characterization of the musculoskeletal system is essential for diagnosis providing the implications for therapy corresponding to causes of the diseases. This paper presents a characterization of an ankle neuromuscular system of patients with spasticity, to provide quantitative pathological level of the ankle spasticity with biomechanical and neurological disorders. Measurements from manual spasticity evaluation combined with a suggested neuromuscular model and parameter optimization process enabled a reliable characterization of the spastic ankle flexors. The model included two non-neural parameters representing the viscoelasticity of the muscle and four neural parameters showing the dynamics of muscle activation and corresponding force only using the measured joint angle and resistance torque. Torque contributions from non-neural parameters especially elastic properties of muscle was greater than 50% of the overall torque, common in both patients with spasticity and healthy controls. Among subgroups of the patients, subjects with short post diseases period less than 5 years, had higher torque contribution level from neural components more than 50% of the overall torque compared to the patients with longer post diseases period more than 10 years who had overall torque less than 30% of the total estimated torque. We concluded that proposed model based ankle flexor characterization served as a tools for diagnosing the patients with spasticity corresponding to their causes of diseases with both quantified neural and non-neural parameters.
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Recommended by Guest Editors Doo Yong Lee (KAIST) and Jaesoon Choi (Asan Medical Center). This research was supported by the Bio & Medical Technology Development Program of the National Research Foundation (NRF) funded by the Korean government (MSIT) (No. NRF-2017M3A9E2063101).
Won-Seok Shin received his B.S. degree in Mechanical Engineering from Hanyang University in 2016, and the M.S. degree in mechanical engineering in 2018 from the Korea Advanced Institute of Science and Technologies (KAIST), Korea, where he is currently working toward a Ph.D. degree in mechanical engineering. His research interests include biomechanics, physical human robot interaction, and wearable robotics.
Handdeut Chang received his B.S. and M.S. degrees from the Department of Mechanical Engineering from Osaka University, Japan, in 2011 and 2013, respectively. He also holds a Ph.D. degree in Mechanical Engineering from Korea Advanced Institute of Science and Technology (KAIST), Korea which he earned in 2019. He is an Assistant Professor in the Department of Mechanical Engineering, Incheon National University, Incheon, Korea. His research interests include biomimetic robotics, variable impedance actuator, nonlinear dynamic system control, physical human robot interaction, and myoprocessor.
Sangjoon J. Kim received his B.S. degree in electrical engineering from the Department of Electrical and Computer Engineering, University of Wisconsin, Madison, USA, in 2012. He has received his M.S. and Ph.D. degree in mechanical engineering from Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea, in 2014 and 2019, respectively. His research interests include wearable robotics, physical human robot interaction, magnetic resonance (MR)-compatible robots and rehabilitation robotics.
Jung Kim received his B.S. and M.S. degrees in mechanical engineering from the Department of Mechanical Engineering, Korea Advanced Institute of Science and Technologies (KAIST), Korea, in 1991 and 1993, respectively, and the Ph.D. degree in mechanical engineering from the Massachusetts Institute of Technology (MIT), Cambridge, MA, USA, in 2003. He is currently a Professor in the Department of Mechanical Engineering, KAIST. His current research interests include medical robotics, haptics, biomechanical signals, and assistive robotics.
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Shin, WS., Chang, H., Kim, S.J. et al. Characterization of Spastic Ankle Flexors Based on Viscoelastic Modeling for Accurate Diagnosis. Int. J. Control Autom. Syst. 18, 102–113 (2020). https://doi.org/10.1007/s12555-019-0245-8
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DOI: https://doi.org/10.1007/s12555-019-0245-8