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The dynamic component was adapted at the mildly degenerative L3\u2013L4 segment, and the static component was fixed at the moderately degenerative L4\u2013L5 segment under a displacement\u2010controlled mode for the finite element study. Furthermore, an intersegmental motion behavior was analyzed experimentally on the synthetic model under a load\u2010controlled mode. Isobar or DTO hybrid fixator could reduce stress\/motion at transition segment, but compensation was affected at the cephalic adjacent segment more than the caudal one. Within the trade\u2010off region (as a motion\u2010preserving balance between the transition and adjacent segments), the stiffness\u2010related problem was reduced mostly in flexion by a flexible Dynesys cord. In contrast, Isobar damper afforded the effect of maximal allowable displacement (more than peak axial stiffness) to reduce stress within the pedicle and at facet joint. Pedicle\u2010screw travel at transition level was related to the extent of disc degeneration in Isobar damper\u2010joint (more than Dynesys cord spacer) attributing to the design effect of axial displacement and angular rotation under motion. In biomechanical characteristics relevant to clinical use, longitudinal cord\/damper of dynamic hybrid lumbar fixators should be designed with less interface stress occurring at the screw\u2010vertebral junction and facet joint to decrease pedicle screw loosening\/breakage under various disc degenerations.<\/jats:p>","DOI":"10.1155\/2022\/8273853","type":"journal-article","created":{"date-parts":[[2022,7,8]],"date-time":"2022-07-08T23:05:08Z","timestamp":1657321508000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Biomechanical Comparison between Isobar and Dynamic\u2010Transitional Optima (DTO) Hybrid Lumbar Fixators: A Lumbosacral Finite Element and Intersegmental Motion 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