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What is spondylitis?

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Spondylitis affects the spinal column. It can cause inflammation and stiffness between your vertebrae -- the bones of your neck, spine, and lower back -- and pelvis. Spondylitis can also attack ligaments that connect muscles to bones and other connective tissue.

SOURCES: National Psoriasis Foundation. Arthritis Foundation. American College of Rheumatology. WebMD Medical Reference "Psoriasis."

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SOURCES: National Psoriasis Foundation. Arthritis Foundation. American College of Rheumatology. WebMD Medical Reference "Psoriasis."

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What is arthritis mutilans?

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