Abstract
Artificial joint acetabular cup stability is essential for successful total hip arthroplasty. However, a quantitative evaluation approach for clinical use is lacking. We developed a resonance frequency analysis (RFA) system involving a laser system that is fully contactless. This study aimed to investigate the usefulness of laser RFA for evaluating acetabular cup stability. First, the finite element method was performed to determine the vibration mode for analysis. Second, the acetabular cup was press-fitted into a reamed polyurethane cavity that replicated the human acetabular roof. The implanted acetabular cup was vibrated with pulse laser irradiation and the induced vibration was detected with a laser Doppler vibrometer. The time domain signal from the vibrometer was analyzed by fast Fourier transform to obtain the vibration frequency spectrum. After laser RFA, the pull-down force of the acetabular cup was measured as conventional implant fixation strength. The frequency of the first highest amplitude between 2 kHz and 6 kHz was considered as the resonance peak frequency, and its relationship with the pull-down force was assessed. The peak frequency could predict the pull-down force (R2 = 0.859, p < 0.000). Our findings suggest that laser RFA might be useful to measure acetabular cup stability during surgery.
Highlights
Shifting global demographics, predominantly an increase in an ageing population, has resulted in an increase in the number of patients with hip osteoarthritis worldwide [1]
We developed a contactless resonance frequency analysis (RFA) vibrometer based on pulse laser and laser Doppler that does not involve the direct attachment of devices, such as magnets, to the implant
The peak frequency of laser RFA was hypothesized to be the predictor of pull-down force, which is a measure of conventional stability that was mostly reflected in the type B pattern
Summary
Predominantly an increase in an ageing population, has resulted in an increase in the number of patients with hip osteoarthritis worldwide [1]. Patients with severe hip osteoarthritis are often indicated for hip surgeries, such as total hip arthroplasty (THA). Surgical outcomes have improved because of established surgical techniques and advances in implant design and materials [3]. Fractures during surgery and loose implants during the early postoperative period have been reported as instances of complications whose. Sensors 2019, 19, 4876 prevalence has increased, due to the increase in the number of surgeries among patients with fragile bones, which correspond to an increase in repetitive surgeries [4,5,6]. Novel approaches to prevent to THA surgery-related complications are warranted
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