Which radiographic projection would be most helpful in differentiating ankylosing spondylitis from osteitis condensans ilii in a 35-year-old male patient with bilateral sacroiliac joint pain?

Question

Quizplus · Accepted Answer

AP pelvis radiographic projection is most helpful in differentiating ankylosing spondylitis from osteitis condensans ilii because it allows for a clear view of the sacroiliac joints, which are key areas affected differently by these conditions. Ankylosing spondylitis typically shows bilateral sacroiliitis with eventual fusion of the sacroiliac joints, while osteitis condensans ilii presents with bilateral triangular sclerosis of the iliac side of the sacroiliac joints without joint space narrowing or erosions.

Which Radiographic Projection Would Be Most Helpful in Differentiating Ankylosing