Abstract
Objective
To evaluate the effect of intravenous (IV) contrast on sensitivity, specificity, and accuracy of magnetic resonance (MR) neurography of the knee with attention to the common peroneal nerve (CPN) in identifying nerve lesions and active muscle denervation changes.
Materials and methods
A retrospective search for contrast-enhanced MR neurography cases evaluating the CPN at the knee was performed. Patients with electrodiagnostic testing (EDX) within 3 months of imaging were included and those with relevant prior surgery were excluded. Two radiologists independently reviewed non-contrast sequences and then 4 weeks later evaluated non-contrast and contrast sequences. McNemar’s tests were performed to detect a difference between non-contrast only and combined non-contrast and contrast sequences in identifying nerve lesions and active muscle denervation changes using EDX as the reference standard.
Results
Forty-four exams in 42 patients (2 bilateral) were included. Twenty-eight cases had common peroneal neuropathy and 29, 21, and 9 cases had active denervation changes in the anterior, lateral, and posterior compartment/proximal muscles respectively on EDX. Sensitivity, specificity, and accuracy of non-contrast versus combined non-contrast and contrast sequences for common peroneal neuropathy were 50.0%, 56.2%, and 52.3% versus 50.0%, 56.2%, and 52.3% for reader 1 and 57.1%, 50.0%, and 54.5% versus 64.3%, 56.2%, and 61.4% for reader 2. Sensitivity, specificity, and accuracy of non-contrast and combined non-contrast and contrast sequences in identifying active denervation changes for anterior, lateral, and posterior compartment muscles were not significantly different. McNemar’s tests were all negative.
Conclusion
IV contrast does not improve the ability of MR neurography to detect CPN lesions or active muscle denervation changes.
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Dr. Daniels, Dr. Ross, Dr. Gardon, and Ms. Li have no conflicts of interest.
Dr. Sneag discloses that HSS has a research agreement with GE.
Dr. Hanna receives royalties from Springer and Thieme as a book author.
Dr. Tuite receives royalties from Elsevier as a book author.
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Daniels, S.P., Ross, A.B., Sneag, D.B. et al. Intravenous contrast does not improve detection of nerve lesions or active muscle denervation changes in MR neurography of the common peroneal nerve. Skeletal Radiol 50, 2483–2494 (2021). https://doi.org/10.1007/s00256-021-03812-w
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DOI: https://doi.org/10.1007/s00256-021-03812-w