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Abstract #3288

Computational Study of the Effect of Orthopedic Plates on Gradient Field-Induced Peripheral Nerve Stimulation in MRI

Lijian Yang1, Xiaolin Yang1, Hui Ye2, Norbert Kaula3, Jianfeng Zheng1, and Ji Chen1
1University of Houston, Houston, TX, United States, 2Loyola University Chicago, Chicago, IL, United States, 3Ncor,LLC, Denver, CO, United States

Synopsis

Keywords: Safety, Gradients, Passive implantable medical device

Motivation: To understand whether orthopedic plates implanted in patients affect the risk of peripheral nerve stimulation (PNS) induced by MRI gradient fields.

Goal(s): To assess if activation thresholds for PNS are altered by the presence of nearby orthopedic plates.

Approach: A combined approach of using anatomical electromagnetic and neurophysiological modeling was employed to evaluate the stimulation threshold for specific nerves, both with and without the implanted plate.

Results: Orthopedic implants can significantly reduce nerve stimulation thresholds by up to 80%. Some reduced thresholds were close to PNS safety limits, indicating a notably lower safety margin for patients with implants compared to those without.

Impact: The observed reduction in PNS thresholds suggests that individualized risk assessments may be necessary for MRI screenings of patients with orthopedic implants.

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Keywords