Ottawa knee rules to aid the decision to refer for an X-ray of the knee after a knee injury
Age 55 years or older
Tenderness at the head of the fibula
Isolated tenderness of the patella
Inability to walk four weight bearing steps both immediately after the injury and on presentation
Inability to walk four weight bearing steps immediately after the injury and in the emergency department
Results
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Reference: Stiell IG, Greenberg GH, Wells GA et al. Prospective validation of a decision rule for the use of radiography in acute knee injuries. JAMA, 1996;275;611-615