FRAX-Style Fracture Risk Estimator (Educational)

Approximate 10-year major osteoporotic & hip fracture risk from age, sex, BMD T-score, and clinical risk factors. Educational only — for clinical use, see frax.shef.ac.uk/FRAX.

Inputs

DXA femoral neck. Leave blank/0 if unknown.

Result

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How to use this calculator

  • Enter age, sex, BMD T-score, and yes/no risk factors.
  • Read educational estimates of 10-year hip + major-osteoporotic-fracture risk.
  • For clinical use, ALWAYS run the official FRAX tool (frax.shef.ac.uk/FRAX) — it is country-calibrated and accepts more inputs.

About this calculator

**Educational approximation only.** The official FRAX® algorithm is country-calibrated, proprietary, and accepts inputs not modeled here (BMI, secondary osteoporosis, exact ethnicity calibration). This calculator uses published UK anchor probabilities (Kanis JA et al. "FRAX® and the assessment of fracture probability in men and women from the UK." Osteoporos Int 2008;19:385) plus published hazard ratios (Kanis JA et al., Osteoporos Int 2007;18:1033 — "Calibration of FRAX®"). T-score adjustment uses Marshall D, BMJ 1996;312:1254 (HR ≈ 2.6 per SD decrease at femoral neck). Major Osteoporotic Fracture ≈ 3.5 × hip risk (Kanis 2008 reference tables, average ratio). Treatment thresholds: NOF 2014 (Cosman, Osteoporos Int 25:2359) — pharmacologic Tx if hip ≥3% OR MOF ≥20% in 10-yr; AACE 2020 similar. **Not medical advice. For real clinical decisions use the official FRAX tool at frax.shef.ac.uk/FRAX, which calibrates to your country.**

Frequently asked

Why "educational"?+
Official FRAX is proprietary and country-calibrated (45+ country versions). This calc uses published UK anchor probabilities + cited HRs as a teaching tool, not a clinical substitute.
Source of the anchors?+
Kanis JA et al., Osteoporos Int 2008;19:385-97 (UK reference). HRs from Kanis 2007 "Calibration of FRAX®." T-score from Marshall D, BMJ 1996;312:1254.
How accurate is this approximation?+
Order-of-magnitude correct for typical inputs in a UK-like population. Can deviate ±50% at extremes (very high/low T-score, multiple combined risk factors, or non-UK calibrations).
Treatment thresholds?+
NOF 2014: Tx if hip ≥3% OR MOF ≥20% / 10 yr. AACE 2020 similar. NICE UK uses different thresholds. Always check current local guideline.
Why no BMI input?+
Official FRAX uses BMI when BMD unavailable; with BMD, BMI effect is small (Kanis 2007). Omitted to keep this educational tool focused.
Is this medical advice?+
NO. For clinical use run https://www.frax.shef.ac.uk/FRAX. This tool is for student teaching / risk-factor education only.

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