Question

which of the following joints can help differentiate ankylosing spondylitis and diffuse idiopathic skeletal hyperostosis?
facet joints
intervertebral disc
uncinate joints
none of the above.

Explanation:

Ankylosing spondylitis typically involves facet joints with inflammation and fusion over time. Diffuse idiopathic skeletal hyperostosis usually spares the facet joints and mainly affects the anterior longitudinal ligament and entheses. The intervertebral disc and uncinate joints are not the key differentiating joints for these two conditions.

Answer:

A. Facet joints