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Open AccessArticle

Wearable Sensor-Based Rehabilitation Exercise Assessment for Knee Osteoarthritis

Department of Biomedical Engineering, National Yang-Ming University, 155, Li-Nong St., Sec.2, Peitou, Taipei 11221, Taiwan
Department of Orthopaedic Surgery, Taichung Veterans General Hospital, 1650 Taiwan Boulevard Sect. 4, Taichung 40705, Taiwan
Author to whom correspondence should be addressed.
Sensors 2015, 15(2), 4193-4211;
Received: 14 October 2014 / Accepted: 26 January 2015 / Published: 12 February 2015
(This article belongs to the Section Physical Sensors)
Since the knee joint bears the full weight load of the human body and the highest pressure loads while providing flexible movement, it is the body part most vulnerable and susceptible to osteoarthritis. In exercise therapy, the early rehabilitation stages last for approximately six weeks, during which the patient works with the physical therapist several times each week. The patient is afterwards given instructions for continuing rehabilitation exercise by him/herself at home. This study develops a rehabilitation exercise assessment mechanism using three wearable sensors mounted on the chest, thigh and shank of the working leg in order to enable the patients with knee osteoarthritis to manage their own rehabilitation progress. In this work, time-domain, frequency-domain features and angle information of the motion sensor signals are used to classify the exercise type and identify whether their postures are proper or not. Three types of rehabilitation exercise commonly prescribed to knee osteoarthritis patients are: Short-Arc Exercise, Straight Leg Raise, and Quadriceps Strengthening Mini-squats. After ten subjects performed the three kinds of rehabilitation activities, three validation techniques including 10-fold cross-validation, within subject cross validation, and leave-one-subject cross validation are utilized to confirm the proposed mechanism. The overall recognition accuracy for exercise type classification is 97.29% and for exercise posture identification it is 88.26%. The experimental results demonstrate the feasibility of the proposed mechanism which can help patients perform rehabilitation movements and progress effectively. Moreover, the proposed mechanism is able to detect multiple errors at once, fulfilling the requirements for rehabilitation assessment. View Full-Text
Keywords: knee joint rehabilitation exercise; wearable sensor; rehabilitation assessment system knee joint rehabilitation exercise; wearable sensor; rehabilitation assessment system
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MDPI and ACS Style

Chen, K.-H.; Chen, P.-C.; Liu, K.-C.; Chan, C.-T. Wearable Sensor-Based Rehabilitation Exercise Assessment for Knee Osteoarthritis. Sensors 2015, 15, 4193-4211.

AMA Style

Chen K-H, Chen P-C, Liu K-C, Chan C-T. Wearable Sensor-Based Rehabilitation Exercise Assessment for Knee Osteoarthritis. Sensors. 2015; 15(2):4193-4211.

Chicago/Turabian Style

Chen, Kun-Hui; Chen, Po-Chao; Liu, Kai-Chun; Chan, Chia-Tai. 2015. "Wearable Sensor-Based Rehabilitation Exercise Assessment for Knee Osteoarthritis" Sensors 15, no. 2: 4193-4211.

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