- 
common in children 
- 
should be a diagnosis of exclusion 
Presentation
- 
limp and pain 
- 
may not be well localised 
- 
painful restriction of motion of the hip joint 
- 
partic in extension +/- abduction in flexion 
- 
specific cause never ID 
- 
pain settles after period of bed rest and observations 
Investigations typically normal
Treat with rest