Whenever a question stem on the step 2 or Step 3 says that the patient has any metallic object implants like pacemakers , prosthetic metal valves, etc - MRI is contraindicated in such a patient.. CT's are preferred in these situation and even or else, cause they are cheaper and can detect pathologies with almost equal effectiveness..
MRIs are generally preferred in spine conditions and early stages of complicated osteomyelitis, diabetic foot or when contrast CT is not possible or contraindicated...
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