Evaluation of the bandwidth dependence of the detection of hip-stem implant loosening using structure borne sound (en)

* Presenting author
Day / Time: 09.03.2023, 16:20-16:40
Room: Saal Y6
Typ: Regulärer Vortrag
Session: Körperschall
Abstract: Loosening of the hip-stem is the main reason for the revision of total hip replacements. Due to current diagnostic methods' low sensitivity and specificity, loosening is often detected too late. In a previous approach, extracorporeally captured structure-borne sound showed potential for anomaly-based detection of implant loosening. For this purpose, an excitation system is mounted inside a modified hip stem implant. The mechanical oscillator of the excitation system is excited by an extracorporeal magnetic coil and extracorporeal acceleration sensors pick up the structure borne sound. For continuous in-vivo monitoring, integrating the entire excitation and sensor system into the implant is advantageous. However, acceleration sensors suitable for integration into the implant cannot capture the same signal bandwidth as the ones previously utilized. To evaluate if a previous approach of anomaly detection using a variational autoencoder can be transferred to an intracorporeal sensor system, this contribution investigates its performance for different sensor bandwidths. To this end, the bandwidth of the structure-borne sound signal is limited by filtering the captured signals.


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