New Biomechanical Approach for Evaluation of Spinal Pedicle Screw Fixation Stability

Autor: Mohammadjavad Einafshar, Ata Hashemi
Rok vydání: 2021
Předmět:
Zdroj: Journal of Medical and Biological Engineering. 41:447-455
ISSN: 2199-4757
1609-0985
Popis: Pull-out test is the conventional biomechanical tool for stability assessments of bone screws. Recently, modal analysis methods (MAM) have gained interest in the fixation stability measurement of dental implants which can be adopted as a new fixation measurement technique for spinal pedicle screws. To test the applicability and accuracy of MAM in predicting the fixation stability of pedicle screws, two different modal analysis approaches were used. First, pedicle screws were incorporated into polyurethane (PU) foam. Then, the time response of an accelerometer attached to the head of the screw and excited by a shock hammer was recorded to perform classical modal analysis (CMA). Simultaneously, sound modal analysis (SMA) was carried out using a sound recording device to obtain the frequency response of the screw-block structure. Lastly, the destructive pull-out test was performed to extract its tangential stiffness (TS) and yield force (YF). Linear regression analysis showed a good correlation between CMA and SMA (R2 = 0.99, P
Databáze: OpenAIRE
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