Clinical use
Use this calculator for knee x-ray decision rule in theemergency medicine workflow. It is decision support and should be interpreted with the patient context, local protocols, and clinician judgment.
Calculate Ottawa Knee
Interpretation
Any positive criterion: X-ray indicated. Sensitivity 98.5%. Reduces unnecessary knee X-rays by ~30%. Apply only to acute knee injuries.
Required inputs
- Age 55 +
- Isolated Patellar Tenderness
- Fibular Head Tenderness
- Inability To Flex 90
- Inability To Bear Weight
Evidence and limitations
This page cites 1 published reference. Confirm units and inclusion criteria before applying the output; calculators do not replace assessment, escalation, or local policy.
References
- Stiell IG et al. Ann Emerg Med 1995;26:405-413
Frequently asked questions
What is the Ottawa Knee Rule?
Ottawa Knee Rule is a clinical calculator used for Knee X-ray decision rule.
How do I interpret the Ottawa Knee Rule?
Any positive criterion: X-ray indicated. Sensitivity 98.5%. Reduces unnecessary knee X-rays by ~30%. Apply only to acute knee injuries.
What inputs are required for the Ottawa Knee Rule?
Required inputs include Age 55 +, Isolated Patellar Tenderness, Fibular Head Tenderness, Inability To Flex 90, Inability To Bear Weight.
What is the evidence behind the Ottawa Knee Rule?
The Ottawa Knee Rule page cites Stiell IG et al. Ann Emerg Med 1995;26:405-413.
Next steps
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