نشریه علمی مهندسی پزشکی زیستی

Force Estimation on the Knee Flexor/Extensor Muscles based on EMG Signal and OpenSim Aided Forward Dynamics Simulation

Document Type : Full Research Paper

Authors

1 Associate Professor, Department of Mechatronics Engineering, University of Tabriz, Tabriz, Iran

2 M.Sc. Graduated, Department of Medical Engineering, University of Tabriz, Tabriz, Iran

3 Assistant Professor, Department of Anatomical Sciences, School of Medicine, Urmia University of Medical Sciences, Urmia, Iran

Abstract
In many cases related to the diagnosis of gait abnormalities, it is important to evaluate the force produced by the knee driving muscles. On the other hand, direct measurement of muscle force requires invasive and even irreversible action, which is practically impossible. One solution to estimate muscle force is to measure the electromyography signal and use musculoskeletal models to calculate muscle force. Therefore, in this paper, a musculoskeletal model was developed for simulation of the knee movement and muscle force estimation in OpenSim software along with OpenSim API in MATLAB. In this model, the EMG signals is used as the input that trigger the forward dynamics, and generate knee movement as output of the model. The knee angle is compared with experimental goniometric data for validation. The experimental data of four muscles of the biceps femoris, semitendinosus rectus femoris, and vastus medialis, along with the knee goniometric signal have been taken from UCI database. The data is pre-processed before use. The muscle model in the OpenSim software is based on the Hill type model and its parameters are set for each muscle separately. The performed analysis is, in fact, the solution of a forward dynamics problem that the software performs. As the result of this study, we can estimate the muscle force of each muscle during flexion/extension of the knee in a sitting position.

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Volume 17, Issue 3
Autumn 2023
Pages 263-271

  • Receive Date 10 April 2024
  • Revise Date 31 May 2024
  • Accept Date 19 June 2024