Mentink, MJA, Van Duren, BH, Murray, DW et al. (1 more author) (2017) A novel flexible capacitive load sensor for use in a mobile unicompartmental knee replacement bearing: An in vitro proof of concept study. Medical Engineering & Physics, 46. pp. 44-53. ISSN 1350-4533
Abstract
Instrumented knee replacements can provide in vivo data quantifying physiological loads acting on the knee. To date instrumented mobile unicompartmental knee replacements (UKR) have not been realised. Ideally instrumentation would be embedded within the polyethylene bearing. This study investigated the feasibility of an embedded flexible capacitive load sensor. A novel flexible capacitive load sensor was developed which could be incorporated into standard manufacturing of compression moulded polyethylene bearings. Dynamic experiments were performed to determine the characteristics of the sensor on a uniaxial servo-hydraulic material testing machine. The instrumented bearing was measured at sinusoidal frequencies between 0.1 and 10 Hz, allowing for measurement of typical gait load magnitudes and frequencies. These correspond to frequencies of interest in physiological loading. The loads that were applied were a static load of 390 N, corresponding to an equivalent body weight load for UKR, and a dynamic load of ±293 N. The frequency transfer response of the sensor suggests a low pass filter response with a −3 dB frequency of 10 Hz. The proposed embedded capacitive load sensor was shown to be applicable for measuring in vivo loads within a polyethylene mobile UKR bearing.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Keywords: | Tibiofemoral forces; Capacitive load sensor; In vitro; Load measurement; UHMWPE mechanical behaviour; Flexible sensor; Polyimide |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Medicine and Health (Leeds) > School of Medicine (Leeds) > Institute of Rheumatology & Musculoskeletal Medicine (LIRMM) (Leeds) > Orthopaedics (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 07 Aug 2018 11:53 |
Last Modified: | 07 Aug 2018 11:53 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.medengphy.2017.05.002 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:134078 |