Kocher Criteria: Helping to differentiate septic hip versus transient synovitis

Kocher criteria for a child with a painful hip, suspected to have septic arthritis:
1) non-weight-bearing on affected side
2) sedimentation rate greater than 40 mm/hr
3) fever
4) WBC >12,000

Criteria met and probability child has septic arthritis
4/4 -- 99%
3/4 -- 93%
2/4 -- 40%
1/4 --  3%

http://jbjs.org/article.aspx?Volume=86&page=1629