4.7-T diffusion tensor imaging of acute traumatic peripheral nerve injury.

Boyer RB, Kelm ND, Riley DC, Sexton KW, Pollins AC, Shack RB, Dortch RD, Nanney LB, Does MD, Thayer WP
Neurosurg Focus. 2015 39 (3): E9

PMID: 26323827 · PMCID: PMC4786003 · DOI:10.3171/2015.6.FOCUS1590

Diagnosis and management of peripheral nerve injury is complicated by the inability to assess microstructural features of injured nerve fibers via clinical examination and electrophysiology. Diffusion tensor imaging (DTI) has been shown to accurately detect nerve injury and regeneration in crush models of peripheral nerve injury, but no prior studies have been conducted on nerve transection, a surgical emergency that can lead to permanent weakness or paralysis. Acute sciatic nerve injuries were performed microsurgically to produce multiple grades of nerve transection in rats that were harvested 1 hour after surgery. High-resolution diffusion tensor images from ex vivo sciatic nerves were obtained using diffusion-weighted spin-echo acquisitions at 4.7 T. Fractional anisotropy was significantly reduced at the injury sites of transected rats compared with sham rats. Additionally, minor eigenvalues and radial diffusivity were profoundly elevated at all injury sites and were negatively correlated to the degree of injury. Diffusion tensor tractography showed discontinuities at all injury sites and significantly reduced continuous tract counts. These findings demonstrate that high-resolution DTI is a promising tool for acute diagnosis and grading of traumatic peripheral nerve injuries.

MeSH Terms (15)

Acute Disease Animals Anisotropy Diffusion Tensor Imaging Disease Models, Animal Female Humans Lower Extremity Male Peripheral Nerve Injuries Rats, Sprague-Dawley ROC Curve Sciatic Neuropathy Sensitivity and Specificity Statistics as Topic

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