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Sensors
Volume 20
Issue 8
10.3390/s20082237
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Article

Sensor Positioning Influences the Accuracy of Knee Rom Data of an E-Rehabilitation System: A Preliminary Study with Healthy Subjects

by
Carlos J. Marques
1,*,
Christian Bauer
2,
Dafne Grimaldo
2,
Steffen Tabeling
2,
Timo Weber
2,
Alexander Ehlert
2,
Alexandre H. Mendes
2,
Juergen Lorenz
2 and
Frank Lampe
1,2
1
Science Office of the Orthopedic and Joint Replacement Department, Schoen Clinic Hamburg Eilbek, Dehnhaide 120, D-22081 Hamburg, Germany
2
Faculty of Life Sciences at the Hamburg University of Applied Sciences, Ulmenliet 19, D-21033 Hamburg, Germany
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(8), 2237; https://doi.org/10.3390/s20082237
Submission received: 25 March 2020 / Revised: 13 April 2020 / Accepted: 14 April 2020 / Published: 15 April 2020
(This article belongs to the Special Issue Wearable, Smart, Pervasive, and Unconventional Sensing for Health Monitoring: Solutions from Today and for Tomorrow)
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Abstract

E-rehabilitation is the term used to define medical rehabilitation programs that are implemented at home with the use of information and communication technologies. The aim was to test whether sensor position and the sitting position of the patient influence the accuracy of knee range of movement (ROM) data displayed by the BPMpathway e-rehabilitation system. A preliminary study was conducted in a laboratory setting with healthy adults. Knee ROM data was measured with the BPMpathway e-rehabilitation system and simultaneously with a BIOPAC twin-axis digital goniometer. The main outcome was the root mean squared error (RMSE). A 20% increase or reduction in sitting height led to a RMSE increase. A ventral shift of the BPMpathway sensor by 45° and 90° caused significant measurement errors. A vertical shift was associated with a diminution of the measurement errors. The lowest RMSE (2.4°) was achieved when the sensor was placed below the knee. The knee ROM data measured by the BPMpathway system is comparable to the data of the concurrent system, provided the instructions of the manufacturer are respected concerning the sitting position of the subject for knee exercises, and disregarding the same instructions for sensor positioning, by placing the sensor directly below the knee.
Keywords: telerehabilitation; e-Health; physiotherapy; range of movement; knee; validity; total knee arthroplasty telerehabilitation; e-Health; physiotherapy; range of movement; knee; validity; total knee arthroplasty

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MDPI and ACS Style

Marques, C.J.; Bauer, C.; Grimaldo, D.; Tabeling, S.; Weber, T.; Ehlert, A.; Mendes, A.H.; Lorenz, J.; Lampe, F. Sensor Positioning Influences the Accuracy of Knee Rom Data of an E-Rehabilitation System: A Preliminary Study with Healthy Subjects. Sensors 2020, 20, 2237. https://doi.org/10.3390/s20082237

AMA Style

Marques CJ, Bauer C, Grimaldo D, Tabeling S, Weber T, Ehlert A, Mendes AH, Lorenz J, Lampe F. Sensor Positioning Influences the Accuracy of Knee Rom Data of an E-Rehabilitation System: A Preliminary Study with Healthy Subjects. Sensors. 2020; 20(8):2237. https://doi.org/10.3390/s20082237

Chicago/Turabian Style

Marques, Carlos J., Christian Bauer, Dafne Grimaldo, Steffen Tabeling, Timo Weber, Alexander Ehlert, Alexandre H. Mendes, Juergen Lorenz, and Frank Lampe. 2020. "Sensor Positioning Influences the Accuracy of Knee Rom Data of an E-Rehabilitation System: A Preliminary Study with Healthy Subjects" Sensors 20, no. 8: 2237. https://doi.org/10.3390/s20082237

APA Style

Marques, C. J., Bauer, C., Grimaldo, D., Tabeling, S., Weber, T., Ehlert, A., Mendes, A. H., Lorenz, J., & Lampe, F. (2020). Sensor Positioning Influences the Accuracy of Knee Rom Data of an E-Rehabilitation System: A Preliminary Study with Healthy Subjects. Sensors, 20(8), 2237. https://doi.org/10.3390/s20082237

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