Talking of dead bone, it is easily visible on xrays.
MRI does not need 2 days to report ideally, howsoever the part complexity may be.
Share xrays and clinical reports(ESR, CBC,
CRP)
Next Steps
Osteomyelitis is not a thing to play around especially in children.
It can cause physeal or growth plate disturbances.
Health Tips
It is an emergency situation(acute) and relatively urgent (chronic) as far as children are involved.