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Knee X-ray Indications: Ottawa Knee Rules (acute)

A) Age over 55 years
B) Isolated patella tenderness
C) Tenderness at head of fibula
D) Inability to flex knee to 90 degrees
E) Inability to bear weight (4 steps) Immediately at site of accident
and in emergency departmen

Pittsburg Knee Rules (acute)

Knee X-ray Indications:
Primary criteria (required):
Blunt trauma or fall type injury
 
Secondary criteria (one of the following present):
A) Age younger than 12 years or over 50 years
or
B) Inability to walk four weight bearing steps in the Emergency Room