Which of the following is a condition of unknown cause in which calcification of bony ridges between vertebrae occurs, creating a lack of mobility with a "bamboo" appearance?

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Ankylosing spondylitis is a condition that causes inflammation and eventual fusion of the joints between the vertebrae. This can result in a bamboo-like appearance on X-rays due to the calcification of the bony ridges between the fused vertebrae. The cause of ankylosing spondylitis is not fully understood.

Which of the Following Is a Condition of Unknown Cause