Ankylosing Spondylitis pelvis

Question 1

How does Ank spond look on a pelvis radiograph ?

Answer 1

Whiskering of the pelvic bones primarily affects the ischial tuberosities.

bridging of the pubic sympysis sometimes.

Fusion of sacroilliac joints.
Reduced bone density.

Question 2

What is the process step by step the sacroilliac joints fuse ?

Answer 2

SACROILLIITIS (erosive change) - affecting lower 3rd first. (loss of joint margins)

SPONDYLITIS (new bone formation)

FUSION