Effects of inter-individual lumbar spine geometry variation on load-sharing: Geometrically personalized Finite Element study

Sadegh Naserkhaki, Jacob L. Jaremko, Marwan El-Rich

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

There is a large, at times contradictory, body of research relating spinal curvature to Low Back Pain (LBP). Mechanical load is considered as important factor in LBP etiology. Geometry of the spinal structures and sagittal curvature of the lumbar spine govern its mechanical behavior. Thus, understanding how inter-individual geometry particularly sagittal curvature variation affects the spinal load-sharing becomes of high importance in LBP assessment. This study calculated and compared kinematics and load-sharing in three ligamentous lumbosacral spines: one hypo-lordotic (Hypo-L) with low lordosis, one normal-lordotic (Norm-L) with normal lordosis, and one hyper-lordotic (Hyper-L) with high lordosis in flexed and extended postures using 3D nonlinear Finite Element (FE) modeling. These postures were simulated by applying Follower Load (FL) combined with flexion or extension moment. The Hypo-L spine demonstrated stiffer behavior in flexion but more flexible response to extension compared to the Norm-L spine. The excessive lordosis stiffened response of the Hyper-L spine to extension but did not affect its resistance to flexion compared to the Norm-L spine. Despite the different resisting actions of the posterior ligaments to flexion moment, the increase of disc compression was similar in all the spines leading to similar load-sharing. However, resistance of the facet joints to extension was more important in the Norm- and Hyper-L spines which reduced the disc compression. The spinal curvature strongly influenced the magnitude and location of load on the spinal components and also altered the kinematics and load-sharing particularly in extension. Consideration of the subject-specific geometry and sagittal curvature should be an integral part of mechanical analysis of the lumbar spine.

Original languageBritish English
Pages (from-to)2909-2917
Number of pages9
JournalJournal of Biomechanics
Volume49
Issue number13
DOIs
StatePublished - 6 Sep 2016

Keywords

  • Finite Element model
  • Inter-individual variation
  • Load-sharing
  • Lumbar Lordosis
  • Lumbar spine
  • Pelvic Incidence
  • Sacral Slope
  • Spine geometry
  • Spine sagittal curvature

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