Not for use in patients <18 or >55 (for OKR), chronic injuries (>7 days), or those with distracting injuries elsewhere.
The Ottawa Knee Rule is designed to have nearly 100% sensitivity for detecting clinically significant fractures. A negative result effectively rules out fracture without the need for an X-ray.
Stiell IG, et al.
Derivation of a decision rule for the use of radiography in acute knee injuries.
