These patients generally have less fever and peripheral leukocytosis/inflammation as compared to more common causes of septic arthritis; however, they will have purulent joint
[healio.com]
The clinical symptoms are local sacroiliac pain, low back pain with or without sciatic pain, associated with inability to bear weight in most cases.
[link.springer.com]
History and physical examination presence of risk factors fever, local pain and tenderness, swelling, decreased range of motion of a joint, erythema, warmth, drainage, sinus
[ocw.tufts.edu]