MRI of the Lumbar Spine with Spinal Fusion Hardware

Introduction to Spinal Fusion Hardware and MRI Safety

The American College of Radiology recommends that patients with spinal fusion hardware can safely undergo MRI of the lumbar spine, and MRI remains the preferred imaging modality for evaluating new or progressive symptoms after lumbar fusion surgery 1
Modern spinal fusion hardware, particularly titanium constructs, is MRI-safe and does not pose a contraindication to MRI at 1.5T or less, according to the Clinical Infectious Diseases journal 2

The American College of Radiology suggests that for patients with prior lumbar surgery and new or progressive symptoms, MRI lumbar spine without and with IV contrast is the most useful initial imaging study 1
Contrast administration accurately distinguishes recurrent or residual disc herniations from postoperative scar tissue, as recommended by the American College of Radiology 1
The American College of Radiology also recommends that contrast helps evaluate nerve root compression or arachnoiditis in the post-surgical spine 1

The American College of Radiology recommends that when metallic artifact significantly limits MRI diagnostic quality, CT myelography is the preferred alternative imaging modality 1
CT myelography effectively assesses spinal canal patency, neural foramina, and nerve root compression despite the presence of hardware, according to the American College of Radiology 1

The American College of Radiology suggests that new or progressive radiculopathy after fusion should be evaluated with MRI with and without contrast 1
The American College of Radiology also recommends that suspected infection or abscess should be evaluated with MRI with and without contrast 1
For hardware integrity concerns, the American College of Radiology suggests using CT without contrast 1

The Clinical Infectious Diseases journal advises against assuming all spinal hardware is MRI-unsafe – modern titanium constructs are MRI-compatible at 1.5T or less 2
The Journal of Neurosurgery recommends against relying on plain radiographs alone, as they have only 64-69% accuracy for detecting complications and significant interobserver variability 5, 6
The American College of Radiology advises against skipping contrast in post-surgical patients with new symptoms, as contrast is essential for distinguishing scar from recurrent disc herniation 1