Vol.67, No.1, 2021, pp.393-409, doi:10.32604/cmc.2021.014446
Timing and Classification of Patellofemoral Osteoarthritis Patients Using Fast Large Margin Classifier
  • Mai Ramadan Ibraheem1, Jilan Adel2, Alaa Eldin Balbaa3, Shaker El-Sappagh4, Tamer Abuhmed5,*, Mohammed Elmogy6
1 Faculty of Computers and Information, Kafrelsheikh University, Egypt
2 Faculty of Physical Therapy, Kafrelsheikh University, Egypt
3 Faculty of Physical Therapy, Nahda University, NUB, Egypt
4 Universidade de Santiago de Compostela, Santiago de Compostela, Spain
5 College of Computing, Sungkyunkwan University, Seoul, 06351, Korea
6 Faculty of Computers and Information, Mansoura University, Mansoura, 35516, Egypt
* Corresponding Author: Tamer Abuhmed. Email:
(This article belongs to this Special Issue: Artificial Intelligence and IoT based intelligent systems using high performance computing for Medical applications.)
Received 21 September 2020; Accepted 03 November 2020; Issue published 12 January 2021
Surface electromyogram (sEMG) processing and classification can assist neurophysiological standardization and evaluation and provide habitational detection. The timing of muscle activation is critical in determining various medical conditions when looking at sEMG signals. Understanding muscle activation timing allows identification of muscle locations and feature validation for precise modeling. This work aims to develop a predictive model to investigate and interpret Patellofemoral (PF) osteoarthritis based on features extracted from the sEMG signal using pattern classification. To this end, sEMG signals were acquired from five core muscles over about 200 reads from healthy adult patients while they were going upstairs. Onset, offset, and time duration for the Transversus Abdominus (TrA), Vastus Medialis Obliquus (VMO), Gluteus Medius (GM), Vastus Lateralis (VL), and Multifidus Muscles (ML) were acquired to construct a classification model. The proposed classification model investigates function mapping from real-time space to a PF osteoarthritis discriminative feature space. The activation feature space of muscle timing is used to train several large margin classifiers to modulate muscle activations and account for such activation measurements. The fast large margin classifier achieved higher performance and faster convergence than support vector machines (SVMs) and other state-of-the-art classifiers. The proposed sEMG classification framework achieved an average accuracy of 98.8% after 7 s training time, improving other classification techniques in previous literature.
Muscle activation onset time; LS-SVM; surface electromyogram; patellofemoral osteoarthritis; the timing of core muscles
Cite This Article
M. R. Ibraheem, J. Adel, A. E. Balbaa, S. El-Sappagh, T. Abuhmed et al., "Timing and classification of patellofemoral osteoarthritis patients using fast large margin classifier," Computers, Materials & Continua, vol. 67, no.1, pp. 393–409, 2021.
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