More on the Ottawa knee rules.
Richman
P B
PB
D003363:Cost Control; D050723:Fractures, Bone / Q000000981:diagnostic imaging / Q000191:economics*; D006801:Humans; D007718:Knee Injuries / Q000000981:diagnostic imaging / Q000191:economics*; D017410:Practice Guidelines as Topic; D011859:Radiography; D012680:Sensitivity and Specificity