MRI Safety with Metal Hip Replacements

Key Safety Points

MRI does not pose a safety hazard to patients with modern hip prostheses—the implants are firmly fixed and will not move or heat dangerously in the magnetic field 1, 2
Metal artifact reduction sequences (MARS-MRI) are specifically designed to enable soft tissue assessment around metallic hip prostheses, including evaluation of the pseudocapsule, tendons, and neurovascular structures 1, 2
The American College of Radiology explicitly supports MRI use for hip prosthesis evaluation, particularly noting that MARS-MRI enables assessment of soft tissues that would otherwise be obscured by metal artifacts 1, 2

MARS-MRI is the first-line imaging modality for detecting adverse reactions to metal debris (ARMD) in symptomatic patients with MoM implants 3
Radiographs may be completely normal in patients with symptomatic pseudotumors, making MRI essential for diagnosis 3
MRI has 95.4% sensitivity for detecting osteolytic lesions around hip prostheses, significantly higher than CT (74.7%) or radiographs (33.3-51.5%) 4

Do not assume MRI is contraindicated simply because a patient has a metal hip replacement, as modern orthopedic implants are MRI-conditional or MRI-safe, and the benefits of soft tissue visualization far outweigh any imaging limitations from metal artifact 1, 2

Detecting pseudotumors and soft tissue masses that are invisible on radiographs 3
Evaluating adverse local tissue reactions (ALTR) including synovitis, effusions, and bursal collections 1, 2
Assessing abductor tendon abnormalities and peritendinous edema in patients with lateral hip pain 3