Ottawa Knee Rules
Purpose[edit | edit source]
To Identify the need to order radiographs after knee trauma
Criteria[edit | edit source]
1. Age>55 years
2. Islolated patellar tenderness without other bone tenderness
3. Tenderness of the fibular head
4. Inability to flex to 90°
5. Inability to bear weight immediately after injury and in the emergency department (4 steps) regardless of limping.
Research[edit | edit source]
Diagnostic Accuracy[edit | edit source]
Adult Population: Sensitivity: 1.0 Specificity: .49-.56
+LR: 1.9-2.3 -LR: 0
Pediatric Population: Sensitivity: 1.0 Specificity: .43
+LR: 1.8 -LR: 0
