Assertion: ankylosing spondylitis | /r/HasProperty | sacroiliac joints
Facets:
Source sentences:
text: Ankylosing spondylitis is typically first noticed in the lower back (lumbar spine) or buttocks (sacroiliac joints between the sacrum and pelvis).
text: Ankylosing spondylitis is a chronic type of arthritis that causes inflammation, pain, and stiffness, most often in the spine and the sacroiliac joints located just above the tailbone.