=====Sacroiliites=====
Anatomy- check this: Where there is ligament there is no synovium.
Orthogonala snitt mot ledytan.
Tecken: Erosion of art fracture, Reduction af art distance, Subchondral sclerosis, Subchondral cysts. => in advanced cases ankylosis.
Most often bilateral.
Either isolated or in assoc with bechterew, psoriasis, reiter.