Ottawa Knee Rule Note: Does not apply to children.
<-- Age 55 years or older.
<-- Tenderness at the head of the fibula.
<-- Isolated tenderness of the patella (no bone tenderness of knee other than patella).
<-- Inability to flex knee to 90 degrees.
<-- Inability to bear weight for four steps both immediately and in the examination room regardless of limping.
Result: Interpretationscore=(age)+(fibula)+(patella)+(flex)+(walk); score>0?'X-ray required':'X-ray not necessary'
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