Biomechanics of a Posterior Lumbar Motion Stabilizing Device: In Vitro Comparison to Intact and Fused Conditions

Spine
Luis Perez-OrriboNeil R Crawford

Abstract

Nondestructive flexibility tests were performed in vitro, comparing multiple conditions of fixation in a single group of specimens. To compare the biomechanical behavior of the lumbar spine in the intact condition, after implanting a novel motion stabilizer, and after implanting a rigid fixator. Two specific scenarios that may benefit from dynamic lumbar stabilization are single-level moderate instability, where the stabilizing tissues are relatively incompetent, and juxta-level to fusion, where the last instrumented level requires intermediate stiffness ("topping off") to prevent transfer of high stresses from the stiffer fusion construct to the intact adjacent levels. Both scenarios were evaluated in vitro. Seven human cadaveric L2-S1 segments were tested (1) intact, (2) after moderate destabilization, (3) after 2-level hybrid posterior fixation, consisting of bilateral dynamic pedicle screws at L4 interconnected with rigid rods to standard pedicle screws at L5 and S1, (4) after 2-level rigid fixation, (5) after 1-level (L4-L5) dynamic fixation, and (6) after 1-level rigid fixation. In each condition, angular range of motion (ROM) and sagittal instantaneous axis of rotation (IAR) were assessed. In 1-level constructs, dynamic ...Continue Reading

References

Jan 1, 1980·Journal of Biomechanics·C W Spoor, F E Veldpaus
Nov 12, 1998·Journal of Spinal Disorders·N R CrawfordC A Dickman
Jan 5, 2000·Clinical Biomechanics·N R CrawfordC A Dickman
May 9, 2002·Archives of Orthopaedic and Trauma Surgery·Wen-Ying ChouChi-Yin Wong
Aug 7, 2003·Journal of Spinal Disorders & Techniques·Philippe Gillet
Aug 7, 2003·Journal of Spinal Disorders & Techniques·W SchmoelzH J Wilke
Jul 15, 2004·The Journal of Bone and Joint Surgery. American Volume·Gary GhiselliEdgar G Dawson
Mar 16, 2005·Spine·Dilip K Sengupta, Harry N Herkowitz
Oct 12, 2005·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Christina A NiosiThomas R Oxland
Oct 10, 2007·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Manohar M PanjabiJens Peter Timm
May 22, 2008·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Tobias L SchulteLars Hackenberg
Jun 16, 2009·Journal of Spinal Disorders & Techniques·Christopher M BonoAlexander R Vaccaro
Jul 1, 2009·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Philippe GédetStephen J Ferguson
Nov 27, 2010·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·C SchillingA Rohlmann
Dec 30, 2011·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Werner SchmoelzAlexander C Disch
Apr 15, 2014·European Journal of Orthopaedic Surgery & Traumatology : Orthopédie Traumatologie·Chunpeng RenYoudi Xue

❮ Previous
Next ❯

Software Mentioned

DSS Stabilization System
Dynesys

Related Concepts

Related Feeds

Biomechanics

Biomechanics examines the generation of internal forces within the body and investigates the effects and control of forces that act on or are produced on tissues. Here are the latest discoveries.