Development of an acoustic measurement protocol to monitor acetabular implant fixation in cementless total hip Arthroplasty: A preliminary study
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Date
2017
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier Ltd
Abstract
In cementless total hip arthroplasty (THA), the initial stability is obtained by press-fitting the implant
in the bone to allow osseointegration for a long term secondary stability. However, finding the insertion endpoint that corresponds to a proper initial stability is currently based on the tactile and auditory
experiences of the orthopedic surgeon, which can be challenging.
This study presents a novel real-time method based on acoustic signals to monitor the acetabular implant fixation in cementless total hip arthroplasty. Twelve acoustic in vitro experiments were performed
on three types of bone models; a simple bone block model, an artificial pelvic model and a cadaveric
model. A custom made beam was screwed onto the implant which functioned as a sound enhancer and
insertor. At each insertion step an acoustic measurement was performed.
A significant acoustic resonance frequency shift was observed during the insertion process for the
different bone models; 250 Hz (35%, second bending mode) to 180 Hz (13%, fourth bending mode) for
the artificial bone block models and 120 Hz (11%, eighth bending mode) for the artificial pelvis model. No
significant frequency shift was observed during the cadaveric experiment due to a lack of implant fixation
in this model. This novel diagnostic method shows the potential of using acoustic signals to monitor the
implant seating during insertion.
Description
Subject(s)
Acetabular cup, Cementless prosthesis, Primary stability, Resonance frequency, Total hip arthroplasty, Vibro-acoustics
Citation
ISSN
1350-4533