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Updated: Mar 25, 2026
An in vivo Rodent Model of Contraction-induced Injury and Non-invasive Monitoring of Recovery
Published on: May 11, 2011
Quantitative STIR of muscle for monitoring nerve regeneration
Alain R Viddeleer1, Paul E Sijens1, Peter M A van Ooijen1
1Department of Radiology, University Medical Center Groningen and University of Groningen, Groningen, The Netherlands.
Purpose:
To assess whether short tau inversion recovery (STIR) MRI sequences can provide a tool for monitoring peripheral nerve regeneration, by comparing signal intensity changes in reinnervated muscle over time, and to determine potential clinical time points for monitoring.
Materials And Methods:
For this prospective study, 29 patients with complete traumatic transection of the ulnar or median nerves in the forearm were followed up to 45 months postsurgery. Standardized 1.5 Tesla STIR-MRI scans of hand muscles were obtained at fixed time intervals. Muscle signal intensities were measured semi-quantitatively and correlated to functional outcome.
Results:
For the patients with good function recovery, mean signal intensity ratios of 1.179 ± 0.039, 1.304 ± 0.180, 1.154 ± 0.121, 1.105 ± 0.046 and 1.038 ± 0.047 were found at 1-, 3-, 6-, 9-, and 12-month follow-up, respectively. In the group with poor function recovery, ratios of 1.240 ± 0.069, 1.374 ± 0.144, 1.407 ± 0.127, 1.386 ± 0.128 and 1.316 ± 0.116 were found. Comparing the groups showed significant differences from 6 months onward (P < 0.001), with normalizing signal intensities in the group with good function recovery and sustained elevated signal intensity in the group with poor function recovery.
Conclusion:
MRI of muscle can be used as a tool for monitoring motor nerve regeneration, by comparing STIR muscle signal intensities over time. A decrease in signal intensity ratio of 50% (as compared to the initial increase) seems to predict good function recovery. Long-term follow-up shows that STIR MRI can be used for at least 15 months after nerve transection to differentiate between denervated and (re)innervated muscles. J. Magn. Reson. Imaging 2016;44:401-410.
Insights
Short tau inversion recovery (STIR) MRI can monitor peripheral nerve regeneration by tracking muscle signal intensity changes over time. This technique helps differentiate between reinnervated and denervated muscles, aiding in recovery assessment.
Area of Science:
- Neuroscience
- Radiology
- Medical Imaging
Background:
- Peripheral nerve injuries, such as traumatic transections, present significant challenges in monitoring recovery.
- Assessing nerve regeneration often relies on functional outcomes, which can be subjective and delayed.
- Novel imaging techniques are needed for objective and timely evaluation of peripheral nerve healing.
Purpose of the Study:
- To evaluate the utility of Short Tau Inversion Recovery (STIR) MRI sequences for monitoring peripheral nerve regeneration.
- To compare STIR MRI signal intensity changes in reinnervated muscles over time with functional recovery.
- To identify optimal clinical time points for using STIR MRI in nerve regeneration monitoring.
Main Methods:
- Prospective study involving 29 patients with forearm nerve transections (ulnar or median nerves).
- Follow-up extended up to 45 months post-surgery with standardized 1.5 Tesla STIR-MRI scans of hand muscles at fixed intervals.
- Semi-quantitative measurement of muscle signal intensities and correlation with functional outcomes.
Main Results:
- Patients with good functional recovery showed normalizing STIR MRI signal intensity ratios from 6 months onward.
- Patients with poor functional recovery exhibited sustained elevated signal intensities from 6 months onward (P < 0.001).
- A 50% decrease in signal intensity ratio from initial increase predicted good functional recovery.
Conclusions:
- STIR MRI is a viable tool for monitoring motor nerve regeneration by assessing muscle signal intensity changes.
- STIR MRI can differentiate between denervated and reinnervated muscles for at least 15 months post-nerve transection.
- The observed signal intensity changes correlate with functional recovery, providing objective assessment of nerve healing.
