Skip to content
DrSonia
Family Medicine Canada
Tools
Screening
Conditions
Prescribing
Referrals
Handouts
Search the site
Search
← Back to tools
Tools & calculators
Ottawa knee rules
X-ray decision rule for acute knee injuries.
Last reviewed 2026-01-06
|
msk | imaging | trauma
Inputs
Age
years
Isolated patella tenderness
Select
No
Yes
Tenderness at head of fibula
Select
No
Yes
Unable to flex knee to 90 deg
Select
No
Yes
Unable to bear weight for 4 steps
Select
No
Yes
Enter values to see the result.
References
Ottawa knee rule derivation study