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Related Concept Videos

General Case of Eccentric Axial Loading01:12

General Case of Eccentric Axial Loading

Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from symmetrical bending, which are essential for designing structures to withstand different loading conditions.
Consider a member subjected to equal and opposite forces that are applied along a line that does not coincide with the member's neutral axis. In unsymmetrical bending,...
Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
Eccentric Loading01:16

Eccentric Loading

Eccentric loading is a crucial concept in the study of structural engineering and mechanics, particularly when analyzing the stability and stress distribution in columns. Unlike centric loading, where the force is applied along the centroidal axis, causing uniform compression, eccentric loading occurs when a force is applied off-center. This off-center application introduces not only direct compressive stress but also bending stress, significantly influencing the column's behavior under load.
Degenerative Disc Disease ll: Pathophysiology01:23

Degenerative Disc Disease ll: Pathophysiology

The symptoms of degenerative disc disease arise from a combination of mechanical compression, vascular compromise, and biochemical inflammation, which together disrupt nerve function and produce pain.Mechanical CompressionDisc degeneration reduces height and elasticity, predisposing to herniation of the nucleus pulposus, a major cause of radicular pain. Herniations may be protrusion (bulging with intact annulus), extrusion (nucleus extends beyond disc but remains connected), or sequestration...
Herniated Intervertebral Disc l: Introduction01:29

Herniated Intervertebral Disc l: Introduction

Intervertebral disc herniation refers to the displacement of the nucleus pulposus (the gel-like inner core of the disc) through a tear or weakened area in the annulus fibrosus (the outer fibrous ring). The displaced disc material extends beyond the normal boundaries of the disc space and may compress or irritate nearby spinal nerve roots or, less commonly, the spinal cord.Etiology and Risk FactorsHerniation commonly results from degeneration, in which aging reduces disc hydration and...

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Related Experiment Video

Updated: Jun 12, 2026

Multilevel Oblique Lumbar Interbody Fusion in Degenerative Lumbar Disc Disease with Instability
11:30

Multilevel Oblique Lumbar Interbody Fusion in Degenerative Lumbar Disc Disease with Instability

Published on: July 25, 2025

A non-optimized follower load path may cause considerable intervertebral rotations.

Marcel Dreischarf1, Thomas Zander, Georg Bergmann

  • 1Julius Wolff Institute, Charité-Universitätsmedizin Berlin, Augustenburger Platz 1, Berlin, Germany.

Journal of Biomechanics
|June 15, 2010
PubMed
Summary
This summary is machine-generated.

A compressive follower load (FL) approximates spinal curvature but its path estimation affects results. Optimizing the FL path is crucial for consistent and comparable biomechanical studies of the spine.

Related Experiment Videos

Last Updated: Jun 12, 2026

Multilevel Oblique Lumbar Interbody Fusion in Degenerative Lumbar Disc Disease with Instability
11:30

Multilevel Oblique Lumbar Interbody Fusion in Degenerative Lumbar Disc Disease with Instability

Published on: July 25, 2025

Area of Science:

  • Biomechanics
  • Spinal Research
  • Finite Element Analysis

Background:

  • Osseoligamentous spinal specimens are susceptible to buckling under vertical compressive forces.
  • A compressive follower load (FL) has been proposed to enable higher axial forces by mimicking spinal curvature without inducing intervertebral rotation.
  • The precise location of the FL path in simulations is typically estimated, potentially introducing variability.

Purpose of the Study:

  • To investigate the impact of non-optimized follower load (FL) path estimations on spinal biomechanics simulations.
  • To determine if optimizing the FL path improves the comparability of finite element analysis (FEA) results.
  • To quantify the effect of estimated FL paths on spinal curvature and intervertebral motion.

Main Methods:

  • A symmetrical finite element model of the lumbar spine was developed.
  • A 500N compressive follower load (FL) was applied to simulate upright standing.
  • Seven different investigators estimated the FL path, and an optimized path was determined.
  • Simulations included additional moments (+/-7.5Nm) to represent flexion and extension.

Main Results:

  • An optimized 500N compressive FL resulted in minimal spinal curvature alteration (<0.25 degrees sagittal cardan angle L1-S1).
  • Individual estimations of the FL path led to significant spinal deviations (up to 10.0 degrees flexion or 12.3 degrees extension).
  • The magnitude of bending moments and measurement type (differential vs. absolute) influenced results from non-optimized paths.

Conclusions:

  • The precise location of the follower load (FL) path significantly impacts spinal biomechanics simulation outcomes.
  • Non-optimized FL path estimations introduce considerable variability, compromising study comparability.
  • Preceding optimization of the FL path location is essential for enhancing the reliability and comparability of spinal biomechanical research.