This paper proposes a system for the detection of hip prosthesis loosening by means of a vibration analysis technique. Although this technique has been adapted before, the novelty presented here lies in the fact that the monitoring is done inside the prosthesis itself, offering better measurement results. Thus, an implantable monitoring system is required, involving low power consumption and miniaturization. Monitoring is done by a miniature, capacitive accelerometer. The monitoring system is equipped with a telemetric link, to provide data transmission from the implant to a PC, where the data are analyzed. The system is powered inductively, since it is intended for long-term implantation.
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