Impact of anchor type on porcine lumbar biomechanics: Finite element modelling and in-vitro validation

Impact of spinal rod stiffness on porcine lumbar biomechanics: Finite element model validation and parametric study

“…This contact configuration was successfully used to partially reproduce the in vitro conditions without having to model the contact conditions between pedicle screw threads and vertebrae. [25][26][27] During the application of the follower load (FL; see boundary and loading conditions), the contacts between the spinal rods and the heads of the pedicle screws were modelled frictionless to allow the screw to slide freely along the rod before the screw heads were tightened. During pure moment loading, these contact conditions were replaced by bonded contacts to represent the tightening of the pedicle screw heads.…”

“…During flexion, the nucleus pressure increased both numerically and experimentally, but decreased in extension due to disc stretching. [23][24][25][36][37][38] More similar nucleus pressure magnitudes might be obtained with more representative porcine disc material properties that must be determined experimentally.…”

Tensile mechanical properties of the cervical, thoracic and lumbar porcine spinal meninges

“…and biomechanical [Wilke et al 2011] levels, the swine model appears as the best transversal human models, next to non-human primates [Schomberg et al 2017], and is increasingly used in spine research [Kim et al2019, Ramo et al 2018b, Brummund et al 2017, Swnindel et al 2013]. In addition, similarities between human and porcine models were highlighted histologically for the dura mater (3 dural layers structure) [Kinaci et al 2020].…”