Assertion: ankylosing spondylitis | /r/CapableOf | affect sacroiliac joints
Facets:
value: usually
type: TEMPORAL
Source sentences:
text: Ankylosing spondylitis is a type of arthritis that usually affects your spine, sacroiliac joints, and the lower back.
text: Ankylosing spondylitis is a form of arthritis which only affects the spine and the sacroiliac joints.