Which of the following joints is classically the first to demonstrate erosive changes seen with ankylosing spondylitis?

Question

Quizplus · Accepted Answer

The sacroiliac joint is classically the first to demonstrate erosive changes seen with ankylosing spondylitis. This is because ankylosing spondylitis typically affects the axial skeleton, with sacroiliac joint involvement being one of the earliest and most characteristic features of the disease. Intervertebral disc and iliofemoral joints are not typically involved in ankylosing spondylitis, and while metacarpophalangeal joints may be involved in the peripheral form of the disease, they are not typically affected early on.

Which of the Following Joints Is Classically the First to Demonstrate