Question

a 25 year - old male patient presents with chronic low back pain and decreased range of motion in the sacroiliac and lower lumbar region. which of the following joint diseases or conditions is this most likely to be?
ankylosing spondylitis
spondylolithiasis
spondylolisthesis
spondylolysis

Explanation:

Ankylosing spondylitis commonly affects young - adult males and presents with chronic low back pain and reduced range of motion in the sacroiliac and lower lumbar regions. Spondylolithiasis refers to the presence of stones in the spine (uncommon and not typical for this presentation). Spondylolisthesis is the forward displacement of one vertebral body over another. Spondylolysis is a defect in the pars interarticularis of the vertebra. Based on the patient's age and symptoms, ankylosing spondylitis is the most likely diagnosis.

Answer:

A. Ankylosing spondylitis