Acute monoarthritis in adults is most commonly caused by infection, trauma, or crystal deposition. REF

Intoeing is believed to be caused by sleeping in the prone position, and sitting on the feet. REF

A positive flexion abduction external rotation (FABER) test that elicits posterior pain indicates involvement of which joint? Sacroiliac REF  

The three most common knee conditions in children and adolescents are patellar subluxation, tibial apophysitis, and patellar tendinitis. REF