Journal
JOURNAL OF BIOMECHANICAL ENGINEERING-TRANSACTIONS OF THE ASME
Volume 137, Issue 12, Pages -Publisher
ASME
DOI: 10.1115/1.4031821
Keywords
biomechanics; spine; pedicle screw; loosening; fixation strength; pullout force; stiffness
Categories
Funding
- Canadian Foundation for Innovation (CFI)
- Natural Sciences and Engineering Council of Canada (NSERC)
- Canada Research Chair in Engineering for Innovations in Spinal Trauma
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Screw loosening is a common complication in spinal fixation using pedicle screws which may lead to loss of correction and revision surgery. The mechanisms of pedicle screw loosening are not well understood. The purpose of this study was to compare the pedicle screw pullout force and stiffness subsequent or not to multidirectional cyclic bending load (toggling). Pedicle screws inserted into porcine lumbar vertebrae underwent toggling in craniocaudal (CC), mediolateral (ML) directions, and no toggling (NT) before pullout. This study suggests that toggling and in particular CC toggling should be included in biomechanical evaluation of pedicle screw fixation strength.
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