🦴 Kocher Criteria (Septic Arthritis of Hip)
UseChild with hip pain when septic arthritis must be distinguished from transient synovitis.
StrataKocher 1999 (PMID 10608376): 0–4 predictors correspond to septic-arthritis probabilities of <0.2%, 3.0%, 40.0…
LimitsNot a diagnosis or disposition decision on its own. · Interpret with history, examination and other tests. · For licensed clinicians; does not replace clinical judgement.
SourceKocher MS, et al. Differentiating between septic arthritis and transient synovitis of the hip in ch…
This-shift next steps
After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.
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Methodology · worked example, guidelines & full notes
Four predictors, 1 point each.
When to use
Child with hip pain when septic arthritis must be distinguished from transient synovitis.
How it works
Non-weight-bearing, fever >38.5 °C, ESR ≥40 mm/h, WBC >12×10⁹/L, 1 point each; 0–4 predictors: <0.2%, 3.0%, 40.0%, 93.1%, 99.6%.
Key points
- Four predictors, 1 point each.
- Probabilities are from the derivation cohort (Kocher 1999).
- CRP was the strongest independent predictor (Caird 2006).
References
- Kocher MS, et al. Differentiating between septic arthritis and transient synovitis of the hip in children. J Bone Joint Surg Am 1999;81:1662-70. PMID 10608376
- Caird MS, et al. Factors distinguishing septic arthritis from transient synovitis of the hip in children. J Bone Joint Surg Am 2006;88:1251-7. PMID 16757758
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Non-weight-bearing | No |
|---|---|
| Fever >38.5 °C | No |
| ESR ≥40 mm/h | No |
| WBC >12×10⁹/L | No |
→Predictors0/4
- Probability of septic arthritis (derivation cohort)：<0.2%
| Non-weight-bearing | Yes (+1) |
|---|---|
| Fever >38.5 °C | Yes (+1) |
| ESR ≥40 mm/h | Yes (+1) |
| WBC >12×10⁹/L | Yes (+1) |
→Predictors4/4
- Probability of septic arthritis (derivation cohort)：99.6%
Verification & sources · governance
FAQ
Frequently asked questions
- Does Kocher Criteria (Septic Arthritis of Hip) upload patient data? Where is it calculated?
- Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
- How is Kocher Criteria (Septic Arthritis of Hip) calculated in practice? Can you show a worked example?
- Inputs: Non-weight-bearing No, Fever >38.5 °C No, ESR ≥40 mm/h No, WBC >12×10⁹/L No → Result: Predictors 0 /4（Probability of septic arthritis (derivation cohort): <0.2%） Inputs: Non-weight-bearing Yes (+1), Fever >38.5 °C Yes (+1), ESR ≥40 mm/h Yes (+1), WBC >12×10⁹/L Yes (+1) → Result: Predictors 4 /4（Probability of septic arthritis (derivation cohort): 99.6%）