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Wednesday, July 10 • 17:50 - 18:10

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In total hip replacement (THR), the surgeon replaces the hip joint with a prosthesis consisting of a stem inserted in the femur and an acetabular cup inserted in the pelvis. In cementless THR, the initial fixation relies on press-fitting the components into the bones, allowing for osseointegration to obtain a long term stability. Since suboptimal fixation can lead to loosening, and excessive press-fit can cause intra-operative fractures, finding the optimal insertion endpoint is crucial, yet challenging for the surgeon, who can rely only on auditory and tactile information. An acoustic, non-destructive, real-time monitoring method was developed, to assess the acetabular implant fixation in cementless THA. An implant is regarded as stable when it shows a limited micromotion, more precisely when under daily loading conditions, it shows a relative motion with respect to the surrounding bone, of less than 150 micrometer. Therefore, the developed acoustic measurement method was benchmarked in vitro with micromotion measurements, using an experimental set-up that measures the micromotion of a loaded implant using LVDT's. The pelvic bone was modeled using 14 artificial bone blocks. The system was excited with hammer impacts on the insertor attached to the acetabular cup. Both transverse and axial excitation were investigated. Acoustic measurements were done at each insertion step. Acoustic output was averaged over five impacts to obtain the frequency spectrum. In each experiment, a significant resonance frequency shift was observed, converging when reaching the end position. The Pearson correlation coefficient between the resonance frequencies of the acoustic measurements and the resultant micromotion was significant and varied between -0.870 and -0.719, depending on the resonance frequency. The developed acoustic method shows potential for non-destructive assessment of the acetabular implant fixation.


Pierre Belanger

Professor, Pierre Belanger
avatar for Daniel Pereira

Daniel Pereira

Postdoc, École de technologie supérieure (ÉTS)


Wednesday July 10, 2019 17:50 - 18:10 EDT
Westmount 1

Attendees (4)