MRI is used in the diagnosis of deep seated abscesses, septic arthritis and osteomyelitis. MRI imaging is the accepted modality of choice for the early detection and surgical localization of osteomyelitis.

Findings on MRI include:

• In abscesses there is an abnormally low intensity signal either homogenous or heterogenous.
• In septic arthritis the following findings are seen:

• Synovial enhancement
• Perisynovial edema
• Joint effusions
• Fluid outpouching
• Fluid enhancement
• Synovial thickening.

• In osteomyelitis the findings seen are:

• Abnormal gadolinium enhancement of the inflammatory site.
• Fractures
• Soft tissue inflammation