Emergency Medicine · Orthopedics

Ottawa Knee Rule calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Age ≥55 yearsIsolated patellar tendernessFibular-head tendernessUnable to flex knee to 90°Unable to bear weight for 4 steps immediately and in evaluation

Result

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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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