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Related Concept Videos

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...
Degenerative Disc Disease I: Introduction01:27

Degenerative Disc Disease I: Introduction

Degenerative disc disease is a chronic condition in which intervertebral discs gradually lose structure and function. It is not infectious or autoimmune; rather, it results from age-related biochemical and mechanical changes, influenced by genetic, metabolic, and environmental factors.Structure and Function of DiscsThe spine contains 23 intervertebral discs that absorb load, distribute forces, maintain spacing, and allow flexibility. Each disc consists of a nucleus pulposus, a gel-like core...
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: May 18, 2026

Transforaminal Full-Endoscopic Lumbar Foraminotomy Under Local Anesthesia for L5/S1 Adjacent Segment Foraminal Stenosis
07:44

Transforaminal Full-Endoscopic Lumbar Foraminotomy Under Local Anesthesia for L5/S1 Adjacent Segment Foraminal Stenosis

Published on: October 17, 2025

Does lumbar microdiscectomy affect adjacent segmental disc degeneration? A finite element study.

Shujie Tang1, Brandon J Rebholz

  • 1Department of Traditional Chinese Medicine, Medical School, Jinan University, Guangzhou, China. wkdd2009@hotmail.com

The Journal of Surgical Research
|October 10, 2012
PubMed
Summary

Microdiscectomy alters lumbar spine biomechanics, potentially accelerating adjacent disc degeneration. This study simulated microdiscectomy in models, revealing increased stress and rotation that may harm spinal discs.

Related Experiment Videos

Last Updated: May 18, 2026

Transforaminal Full-Endoscopic Lumbar Foraminotomy Under Local Anesthesia for L5/S1 Adjacent Segment Foraminal Stenosis
07:44

Transforaminal Full-Endoscopic Lumbar Foraminotomy Under Local Anesthesia for L5/S1 Adjacent Segment Foraminal Stenosis

Published on: October 17, 2025

Area of Science:

  • Biomechanical Engineering
  • Spinal Surgery
  • Orthopedics

Background:

  • Microdiscectomy is a common surgery for lumbar disc herniation.
  • Post-surgery, fibrocartilaginous tissue replaces disc material, altering disc properties and biomechanics.
  • This may lead to adjacent segmental disc degeneration, a poorly studied complication.

Purpose of the Study:

  • To investigate the biomechanical effects of microdiscectomy on adjacent spinal segments.
  • To assess the impact of microdiscectomy on intradiscal pressure, intersegmental rotation, and stress.

Main Methods:

  • A 3D finite element model of L3-L5 was used.
  • Mild and moderate disc degeneration models were created, with and without simulated microdiscectomy.
  • Models were subjected to compressive and rotational loads to simulate physiological movement.

Main Results:

  • Microdiscectomy models showed higher intradiscal pressure, intersegmental rotation, and stress in the L3-L4 segment compared to non-microdiscectomy models.
  • These increases were observed across various motion directions.
  • Some parameters showed slightly reduced values in moderate degeneration models under specific movements.

Conclusions:

  • Lumbar microdiscectomy can significantly alter spinal biomechanics.
  • These alterations may adversely affect the development of adjacent upper segmental disc degeneration.