- Direct extension from truama/surgery or spread from systemic infection
- Recent injection into hip, trauma that could introduce bacteria
- Systemic bacteremia w/OA or otherwise structurally abnl joint
- Immunocompromised
- Acute pain w/any range of motion
- Fever and chills
- Typically not weight bearing
- Warmth and redness around affected hip
- Swelling and/or induration
- Pain with any movement (e.g. active or passive ROM, + log roll)