Journal
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE
Volume 227, Issue H2, Pages 175-180Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/0954411912462813
Keywords
Uncemented fixation; hip arthroplasty; vibration; noise
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Funding
- NIHR through the Leeds Musculoskeletal Biomedical Research Unit
- NIHR through WELMEC, a Centre of Excellence in Medical Engineering
- Welcome Trust
- EPSRC [WT 088908/Z/09/Z]
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Preparation of the proximal femur using incremental broaches to create the ideal cancellous bone envelope is an important technique to perfect in uncemented hip arthroplasty. To guide broaching adequacy and final implant position, the surgeon can use audible pitch changes produced by the femoral broach and definitive implant. The aim of this study was to characterise these pitch changes by analysing the sound spectra created by the first broach, last broach and implant using spectral analysis software. The last broach and implant introduction spectra demonstrated low-frequency (4001200 Hz) spectral peaks that were not detected when using the first broach. These frequencies corresponded to the natural resonant frequency of a standing sound wave within the femoral bone canal (similar to 894 Hz) that was estimated using acoustic physics theory. The remaining spectral peaks were associated with transverse vibration modes produced by striking the metal broach handle and implant introducer and were a function of the constructs geometry and material properties.
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