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| ==Rule==
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| If any of the following are present, order XR:
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| # age 55 or older
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| # isolated tenderness of patella (no bone tenderness of knee other than patella)
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| # tenderness of head of fibula
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| # inability to bear weight both immediately and in the emergency department for 4 steps (unable to transfer weight twice onto each lower limb regardless of limping)
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| ==Validation==
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| *Prospectively validated in 1024 adults <ref> Stiell IG, et al, Prospective validation of a decision rule for the use of radiography in acute knee injuries., JAMA. 1996 Feb 28;275(8):611-5. PMID: 8594242 </ref>
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| *Sensitivity for fractures of knee is 100% (95% confidence interval: 0.94 to 1.0)
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| ==Sources==
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| <references/>
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