Is an mri in the foot a good? ?indicator of a bone infection?

Yes, but: The only way to truly diagnose a bone infection is with a bone biopsy, where a small piece of bone is taken out for analysis. This is a simple office procedure usually, using a specialized bone biopsy needle. Bone infections are serious, especially if you are diabetic or have circulation problems or neuropathy. I do think it's prudent to get an MRI when a bone infection is suspected, however.

Bone biopsy : Gives the best answer. Mri is good but not definite.

Yes, if: It is performed without and with IV contrast. These are highly sensitive and specific tests for infection especially in the appropriate clinical scenario (diabetic, enhancement contiguous with a foot ulcer) and if assessed by a competent radiologist. Read more here: http://www.Conciergeradiologist.Com/mri-with-contrast.Html.