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Related Experiment Video

Updated: Jul 6, 2026

3D Kinematic Analysis for the Functional Evaluation in the Rat Model of Sciatic Nerve Crush Injury
08:20

3D Kinematic Analysis for the Functional Evaluation in the Rat Model of Sciatic Nerve Crush Injury

Published on: February 12, 2020

Is the Sciatic Functional Index always reliable and reproducible?

Vanessa Vilela Monte-Raso1, Cláudio Henrique Barbieri, Nilton Mazzer

  • 1Orthopedic and Rehabilitation Postgraduation Program, Department of Biomechanics, Medicine and Rehabilitation of the Locomotor Apparatus, Ribeirão Preto School of Medicine, São Paulo University, Brazil.

Journal of Neuroscience Methods
|March 8, 2008
PubMed
Summary

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The Sciatic Functional Index (SFI) is reliable for assessing rat sciatic nerve recovery after 3 weeks. Early measurements show low examiner agreement due to unclear footprints.

Area of Science:

  • Neuroscience
  • Regenerative Medicine
  • Biomedical Engineering

Background:

  • The Sciatic Functional Index (SFI) is crucial for evaluating sciatic nerve injury and recovery in rat models.
  • Current SFI assessment relies on subjective footprint analysis, potentially introducing variability.
  • Computer-aided methods aim to improve the objectivity and reproducibility of SFI measurements.

Purpose of the Study:

  • To evaluate the interpersonal reproducibility of a computer-aided Sciatic Functional Index (SFI) method.
  • To assess data variability in SFI measurements performed by different examiners.
  • To determine the reliability of the SFI method in different postoperative weeks following sciatic nerve injury.

Main Methods:

  • A severe crush injury was induced on the sciatic nerve of 20 Wistar rats.

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  • The SFI was measured by four examiners (one experienced, three new) weekly for 8 weeks post-surgery.
  • Three measurements per footprint were averaged for statistical analysis.

    • Main Results:

    • High interpersonal correlation (0.82) was observed from week 3 onwards, except for a drop in week 6.
    • Minimal interpersonal correlation (near 0) was found in weeks 1 and 2.
    • Variability between animals and examiners was similar in the early weeks due to poor footprint definition.

    Conclusions:

    • The computer-aided Sciatic Functional Index (SFI) method demonstrates reliability from the third week post-severe sciatic nerve injury in rats.
    • Early postoperative SFI measurements (weeks 1-2) are unreliable due to subjective footprint interpretation.
    • Standardized training and clear footprint definition are essential for accurate SFI assessment in preclinical studies.