Emergency Medicine · Orthopedics
Ottawa Knee Rule calculator
Enter the published formula inputs below to calculate and interpret this score.
Clinical inputs
Result
0
Ottawa Knee Rule negative
No knee radiograph is indicated by the rule.
Formula inputs
- Age ≥55 years
- Isolated patellar tenderness
- Fibular-head tenderness
- Unable to flex knee to 90°
- Unable to bear weight for 4 steps immediately and in evaluation
Primary source
Stiell IG et al. Derivation of a decision rule for radiography in acute knee injuries. Ann Emerg Med (1995)
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