{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,28]],"date-time":"2026-04-28T03:05:07Z","timestamp":1777345507800,"version":"3.51.4"},"reference-count":78,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2016,2,18]],"date-time":"2016-02-18T00:00:00Z","timestamp":1455753600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Magnetic Resonance Imaging"],"published-print":{"date-parts":[[2016,8]]},"abstract":"<jats:sec><jats:title>Purpose<\/jats:title><jats:p>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.<\/jats:p><\/jats:sec><jats:sec><jats:title>Materials and Methods<\/jats:title><jats:p>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\u2010MRI scans of hand muscles were obtained at fixed time intervals. Muscle signal intensities were measured semi\u2010quantitatively and correlated to functional outcome.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>For the patients with good function recovery, mean signal intensity ratios of 1.179 \u00b1 0.039, 1.304 \u00b1 0.180, 1.154 \u00b1 0.121, 1.105 \u00b1 0.046 and 1.038 \u00b1 0.047 were found at 1\u2010, 3\u2010, 6\u2010, 9\u2010, and 12\u2010month follow\u2010up, respectively. In the group with poor function recovery, ratios of 1.240 \u00b1 0.069, 1.374 \u00b1 0.144, 1.407 \u00b1 0.127, 1.386 \u00b1 0.128 and 1.316 \u00b1 0.116 were found. Comparing the groups showed significant differences from 6 months onward (<jats:italic>P<\/jats:italic> &lt; 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.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>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\u2010term follow\u2010up 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. 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