Side-by-side comparison helps you choose the right calculator for a specific clinical question.
Orthopedics
Apply the Ottawa Knee Rules to determine if a knee X-ray is needed after acute knee injury. ~99% sensitivity for clinically significant fractures. Reduces knee X-rays by over 25% when applied correctly.
Formula
X-ray indicated if: age ≥55 OR isolated patella tenderness OR fibular head tenderness OR inability to flex to 90° OR inability to bear weight 4 steps.
Inputs
Orthopedics
Use the Ottawa Ankle Rules to determine if an ankle X-ray is needed after injury. A validated clinical decision rule with ~98% sensitivity for fractures.
Formula
X-ray indicated if: bone tenderness along distal 6 cm of malleolus OR inability to bear weight 4 steps OR tenderness at navicular OR tenderness at base of 5th metatarsal.
Inputs