Ankylosing spondylitis other imaging findings

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Other imaging findings

Bone scintigraphy

• May be helpful in selected patients with normal or equivocal findings on sacroiliac joint radiographs
• Qualitative assessment of accumulation of radionuclides in the SI joints may be difficult due to normal uptake in this location. Thus quantitative analysis may be more useful.
• Ratios of SI joint to sacral uptake of 1.3:1 or higher is abnormal