A 25-year-old man complains of lower back pain and stiffness improving with exercise but worse at rest. He has reduced chest expansion. Which investig...

Question

A 25-year-old man complains of lower back pain and stiffness improving with exercise but worse at rest. He has reduced chest expansion. Which investigation is key to confirm the suspected diagnosis?

Accepted Answer

Plain X-ray of the sacroiliac joints

Answer

Rheumatoid factor

Answer

Anti-nuclear antibodies

Answer

HLA-B27 testing

Answer

MRI brain

ukmla MCQ (SBA): Ankylosing Spondylitis

A 25-year-old man complains of lower back pain and stiffness improving with exercise but worse at rest. He has reduced chest expansion. Which investigation is key to confirm the suspected diagnosis?