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Vol. 151, No. 4, April 2013, pp. 113-121




An Optimised Electronic System for in-vivo Stability Evaluation of Prostheses in Total Hip and Knee Arthroplasty

1 Shiying HAO and 2 John TAYLOR

1 Department of Biomedical Engineering,

UCL Institute of Orthopaedics and Musculoskeletal Science, HA5 1BJ, UK

Tel: +442089540268

2 Department of Electronic and Electrical Engineering, University of Bath, BA2 7AY, UK

1 E-mail: rejash0@ucl.ac.uk


Received: 14 November 2012   /Accepted: 18 April 2013   /Published: 30 April 2013

Digital Sensors and Sensor Sysstems


Abstract: This paper describes the optimization of a set of initial parameter values in an implantable, remotely interrogated electronic displacement sensor for use in applications of such as implants for total hip and total knee arthroplasty. This is the first reported implantable electronic system capable of satisfactorily measuring both postoperative migration and micromotion. In earlier reported work by the same authors, the initial parameter values of the differential variable reluctance transducer (DVRT), which is the key component of the system, were chosen somewhat randomly and were not optimal. In this short paper, the influence of the initial resistance and coil parameters in the bridge on the operation of the DVRT is explored in terms of the accuracy, resolution, detection range of the measurement and the coil size.


Keywords: Optimization, Micromotion, Migration, Implantable displacement sensor, DVRT


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