Load sharing in lumbar spinal segment as a function of location of center of rotation

• DOI: 10.3171/2014.1.spine13426
• Publication Date: 2014-02-28T15:17:52Z
• Authors: Yunus Alapan; Semih Sezer; Cihan Demir; Tuncay Kaner; Serkan İnceoğlu
• Keywords: Facet (psychology); Biomechanics; Vertebra

Object The center (axis) of rotation (COR) in the lumbar spine has been studied well. However, there is limited information on kinetic and kinematic consequences imposed shift location COR, although this type can be seen after surgeries using motion preservation or dynamic stabilization devices. objective study was to assess changes spinal segment due various CORs. Methods A 3D finite element model L4–5 constructed validated. loaded under a 7.5-Nm bending moment while constrained rotate about CORs sagittal axial planes. Range motion, ligament forces, facet loads, disc stresses were measured. Results present showed an agreement with previous vitro studies same load boundary conditions. stresses, loads strong association COR. Conclusions Acute alterations COR significantly change sharing characteristics within segment. normal result tendency vertebra move path least cumulative resistance.