Emergency Medicine · Orthopedics
Pittsburgh Knee Rule calculator
Enter the published formula inputs below to calculate and interpret this score.
Clinical inputs
Result
0
Pittsburgh knee rule negative
Interpret only within the cited source population and criteria; use alongside complete clinical assessment.
Formula inputs
- age ge 55
- isolated patella tenderness
- fibular head tenderness
- unable flex 90
- unable bear weight
Primary source
Seaberg DC et al. Multicenter comparison of two clinical decision rules for the use of radiography in acute, high-risk knee injuries. Ann Emerg Med. DOI: 10.1016/S0196-0644(94)70077-2. PMID: 8161064. Scope: Pittsburgh knee rule counts age ≥55, isolated patellar tenderness, fibular head tenderness, inability to flex to 90°, and inability to bear weight; any criterion indicates radiography indicated. (1994)
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