Knee Fracture: Likelihood Ratios

Introduction: None written.

The likelihood ratios of findings for Knee Fracture are listed below. See the left navigation bar to change the display.

Pre-Test Probability (Prevalence): %.	Post-Test Probability (Predictive Value): %.	Switch to display mode.
Note that calculating probabilities from more than one** finding is inherently inaccurate because findings are not independent. (For example, using two positive findings that share a common pathogenesis is likely to overestimate the true probability.)

Good Positive and Negative Likelihood Ratios
Finding	Result	+LR	-LR
[ + ] Ottawa Knee Rule	+ 0 -	2	0
>=1 of: Age >55 Tenderness at head of fibula Isolated tenderness of patella Inability to flex to 90 degrees Inability to bear weight for 4 steps BOTH immediately and in the ED Study: Ann Intern Med. 2003 Oct 7;139(7):575-88. PMID: 14530229