MRI has high sensitivity for the detection of osteomyelitis in the diabetic foot but lower specificity related to Charcot neuropathic osteoarthropathy. If diagnostic uncertainty persists, a bone biopsy is indicated. The inflammatory hyperaemia caused by the ulcer deteriorates the diagnostic quality of 40%-50% of MR angiography studies in the infrapopliteal region. In these cases, selective arteriography is appropriate, as it can be performed in the same session as angioplasty.
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