Mechanical Properties of Human Lumbar Spine Motion Segments—Part I: Responses in Flexion, Extension, Lateral Bending, and Torsion

Abstract

In this first part of a three-part report, the mechanical behavior of 42 fresh human cadaver lumbar motion segments in flexion, extension, lateral bending, and torsion is examined. Motions and intradiskal pressure changes that occurred in response to these loads, with posterior elements both intact and excised, are reported.

Uneven intervertebral motion sharing is related to disc degeneration and is greater in patients with chronic, non-specific low back pain: an in vivo, cross-sectional cohort comparison of intervertebral dynamics using quantitative fluoroscopy

“…The lumbar spine is a kinetic chain that requires the sharing of motion between levels during bending. Various aspects of intervertebral motion sharing have been investigated in cadaveric studies [17][18][19] in plain radiographic studies in vivo [20][21][22][23][24] and in continuous radiographic studies [3,5,8,20,[25][26][27][28][29][30]. Most of these have studied motion onset and displacement; however, two that studied displacement [4,24] and one that studied pattern variations [29], found differences between patients with CNSLBP and controls.…”

Effect of an internal fixator and a bone graft on intersegmental spinal motion and intradiscal pressure in the adjacent regions

“…In vitro measurements of intradiscal pressure [1,13,16,32] and intersegmental motion [2,14,24,31] have been performed previously, mostly in monosegmental specimens or in only one segment of a multisegmental Abstract Stabilizing a lumbar spine with an implant alters the mechanical properties of the bridged region. In order to determine whether this procedure is associated with higher loads in the adjacent segments, seven lumbar cadaver spines were mounted in a spine tester and loaded with pure moments of flexion/extension, left and right lateral bending, and left and right axial rotation.…”

A biomechanical study of lumbar spondylolysis based on a three‐dimensional finite element method

“…Methods performed using cadaveric specimens or models [7,12, For analytical accuracy, a separation of cortical and cancellous [14][15][16][17][18][19][20][21][22][23][24][25]. "Owever$ few bone was performed for the posterior elements of the vertebrae, while stress distribution in spondylolysis through motion the material nonlinearities of the ligaments and annular fibers, as well exist concerning segments in this type of study.…”