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Related Concept Videos

Test for Homogeneity01:23

Test for Homogeneity

The goodness–of–fit test can be used to decide whether a population fits a given distribution, but it will not suffice to decide whether two populations follow the same unknown distribution. A different test, called the test for homogeneity, can be used to conclude whether two populations have the same distribution. To calculate the test statistic for a test for homogeneity, follow the same procedure as with the test of independence. The hypotheses for the test for homogeneity can be stated as...
Multiple Comparison Tests01:13

Multiple Comparison Tests

Multiple comparison test, abbreviated as MCT, is a post hoc analysis generally performed after comparing multiple samples with one or more tests. An MCT will help identify a significantly different sample among multiple samples or a factor among multiple factors.
It would be easy to compare two samples using a significance alpha level of 0.05. In other words, there is only one sample pair to be compared. However, it would be difficult to identify a significantly different sample if the number...
Identifying Statistically Significant Differences: The F-Test01:14

Identifying Statistically Significant Differences: The F-Test

The F-test is used to compare two sample variances to each other or compare the sample variance to the population variance. It is used to decide whether an indeterminate error can explain the difference in their values. The underlying assumptions that allow the use of the F-test include the data set or sets are normally distributed, and the data sets are independent of each other. The test statistic F is calculated by dividing one variance by another. In other words, the square of one standard...
Significance Testing: Overview01:04

Significance Testing: Overview

Significance testing is a set of statistical methods used to test whether a claim about a parameter is valid. In analytical chemistry, significance testing is used primarily to determine whether the difference between two values comes from determinate or random errors. The effect of a particular change in the measurement protocol, analyst, or sample itself can cause a deviation from the expected result. In the case of a suspected deviation/outlier, we need to be able to confirm mathematically...

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Related Experiment Video

Updated: Jul 14, 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

Multidirectional testing of one- and two-level ProDisc-L versus simulated fusions.

Manohar Panjabi1, Gweneth Henderson, Celeste Abjornson

  • 1Biomechanics Research Laboratory, Department of Orthopaedics and Rehabilitation, Yale University School of Medicine, New Haven, CT 06520-8071, USA. manoharpanjabi@gmail.com

Spine
|May 23, 2007
PubMed
Summary

Lumbar artificial disc replacement (ProDisc-L) preserved motion and showed minimal adjacent-level effects. Spinal fusion, however, significantly increased adjacent-level effects in this biomechanical study.

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A Proinflammatory, Degenerative Organ Culture Model to Simulate Early-Stage Intervertebral Disc Disease.

Published on: February 14, 2021

Area of Science:

  • Biomechanical engineering
  • Spinal surgery
  • Orthopedic research

Background:

  • Artificial discs aim to reduce adjacent segment degeneration compared to spinal fusion.
  • Biomechanical assessment provides valuable insights where long-term clinical data is impractical.

Purpose of the Study:

  • To compare intervertebral rotation changes between lumbar ProDisc-L and simulated spinal fusion.
  • To evaluate adjacent-level effects using multidirectional testing under follower load.

Main Methods:

  • In vitro biomechanical study using human cadaveric lumbar specimens (T12-S1).
  • Multidirectional testing (flexion-extension, lateral bending, torsion) with the Hybrid test method.
  • Comparison of intact specimens with five constructs: ProDisc-L, fusion, and combinations at L4-L5 and L5-S1.

Main Results:

  • ProDisc-L constructs (one- and two-level) demonstrated minimal adjacent-level effects across all rotation types.
  • Simulated one- and two-level spinal fusions resulted in significantly increased adjacent-level effects (average 7.8% and 35.3%, respectively).
  • Combined ProDisc-L and fusion constructs showed adjacent-level effects comparable to single-level fusion.

Conclusions:

  • ProDisc-L implantation generally preserved physiologic motion at all spinal levels.
  • Simulated spinal fusion procedures led to significant adjacent-level effects, indicating potential for accelerated degeneration.