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Related Experiment Video

Updated: Mar 3, 2026

A Mouse Model of Lumbar Spine Instability

A Mouse Model of Lumbar Spine Instability

Published on: April 23, 2021

The segment-dependent changes in lumbar intervertebral space height during flexion-extension motion.

M Fu¹, Q Ye², C Jiang¹

¹Director of Department of Anatomy, Department of Anatomy, Guangdong Provincial Key Laboratory of Medical Biomechanics, Southern Medical University, Baiyun District, Guangzhou, Guangdong, China.

Bone & Joint Research

|April 29, 2017

Summary

Lumbar spine motion causes segment-dependent changes in intervertebral space height. Flexion increases anterior disc height more at lower levels, while extension shows varied anterior-posterior height changes across segments.

Keywords:

Intervertebral space height Kinematics Segment-dependent

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Area of Science:

Biomechanics
Spinal Anatomy
Surgical Innovation

Background:

Lumbar spine kinematics and disc morphology are studied, but segment-specific changes in intervertebral space height during flexion-extension are unclear.
Understanding these dynamic changes is crucial for lumbar spine research and surgical planning.

Purpose of the Study:

To investigate the segment-dependent immediate changes in lumbar intervertebral space height during flexion-extension motion.
To analyze how disc height and posterior approach parameters change at different lumbar levels.

Main Methods:

Validated custom mechanical loading equipment for lumbar specimen testing.
Performed CT scans on eight lumbar specimens in neutral, flexion, and extension positions.
Reconstructed 3D lumbar models to measure changes in disc height and distance between pedicle screw entry points (DASEP) at L3/4, L4/5, and L5/S1.

Main Results:

All motion segments showed greater disc height and DASEP changes from neutral to flexion compared to neutral to extension.
Anterior disc height changes increased progressively from upper to lower lumbar levels during flexion.
From neutral to extension, anterior and posterior disc height changes were similar at L4/5, but anterior changes were significantly greater at L3/4 and L5/S1.

Conclusions:

Lumbar motion segments exhibit distinct, level-specific alterations in disc height and DASEP.
Findings contribute to understanding the physiological dynamics of the lumbar spine.
Data may aid in optimizing parameters for lumbar surgical instruments.