Ankle x-ray needed if:
Pain near the maleoli AND
Inability to bear weight immediately and in the ED (4 steps) OR
Tenderness at posterior edge or tip of lateral malleolus OR
Tenderness at posterior edge or tip of medial malleolus
Foot x-ray series needed if:
Pain in the midfoot AND
Inability to bear weight both immediately and in the ED (4 steps) OR
Tenderness at the navicular OR
Tenderness at the base of the 5th metatarsal
Ottawa ankle rules
Ottawa knee rules
SAD PERSONS score
Arthrocentesis: ankle
Arthrocentesis: elbow
Arthrocentesis: knee
Arthrocentesis: wrist
Arthrocentesis: toe