U.S. FRAX Hip Estimate Tool

Estimate hip fracture risk with U.S. factor inputs. Compare BMI, BMD, and clinical flags clearly. Save simple summaries for better clinician review sessions today.

Calculator Inputs

Formula Used

This page uses a transparent educational scoring model. It is not the official FRAX equation.

BMI = weight in kilograms / height in meters².

Approximate T-score from BMD = (femoral neck BMD - 0.858) / 0.120.

Risk model = (1 - exp(-exp(L))) × 100 × U.S. calibration factor.

L = -6.65 + age term + sex term + BMI term + BMD term + clinical risk terms + modifier terms.

The clinical terms include prior fracture, parent hip fracture, smoking, glucocorticoids, rheumatoid arthritis, secondary osteoporosis, and alcohol use. Extra modifier terms include falls, diabetes, and recent fracture.

How to Use This Calculator

  1. Enter age, sex, height, and weight.
  2. Select the U.S. calibration group that best matches the record.
  3. Choose no BMD, femoral neck T-score, or femoral neck BMD.
  4. Mark each clinical risk factor as yes or no.
  5. Add optional modifiers for falls, diabetes, or recent fracture.
  6. Press Calculate to view the result below the header.
  7. Use CSV or PDF to save a copy.

Example Data Table

Example Age Sex BMI T-score Prior fracture Parent hip fracture Smoking Estimated hip risk
Low factor profile 58 Female 27.2 Not used No No No Below review threshold
Bone density review 72 Female 23.5 -2.4 No Yes No Elevated estimate
Multiple factor profile 81 Male 21.8 -2.8 Yes Yes Yes High estimate

Article

Why hip fracture estimation matters

Hip fracture risk grows with age. It also changes with body size, past fracture history, family history, medicine exposure, smoking, alcohol use, and bone density. A single number cannot describe a person completely. Still, a structured estimate helps collect the right details before a medical visit.

This tool uses the same input style as the common fracture assessment workflow. It asks for age, sex, body measurements, clinical risk flags, and optional femoral neck bone density. The page then applies a transparent educational score. It is not the official engine. The official calculator uses country calibrated equations and mortality data. Those equations are not reproduced here.

The result can support planning. A low estimate may suggest routine prevention talks. An elevated estimate may justify a closer review. A higher estimate can help a clinician decide whether testing, treatment, or fall prevention should be discussed. The output is best used with a bone health professional, especially when the person has kidney disease, cancer therapy, frequent falls, recent fracture, or medicines that affect bone.

BMI is included because low body weight can raise fracture risk. Femoral neck T score is included because hip bone density is a strong predictor. The optional BMD field can be converted into an approximate T score. This gives flexibility when a report lists density instead of T score.

Risk factors are entered as simple yes or no choices. That keeps the form fast. It also creates limits. Dose, duration, number of fractures, and fall pattern can matter. The modifier fields let you mark diabetes, recent fracture, and fall frequency, but they remain an estimate.

Good inputs matter. Use a recent DXA report when available. Measure height and weight carefully. Select yes only when the factor truly applies. When unsure, leave a note and ask a clinician to review the detail. Recheck the estimate when health status or treatment changes later on.

Use the CSV and PDF exports for records. They show inputs and outputs in a compact format. Keep them with the date and patient label. Do not use the estimate as a diagnosis. Do not start or stop medicine from this page. Use it as a preparation tool for informed clinical discussion.

FAQs

Is this the official FRAX calculator?

No. This is an educational estimate tool. It uses common fracture risk inputs, but it does not reproduce the official FRAX engine or replace clinical judgment.

What age range should I enter?

The form limits age from 40 to 90. Values outside that range are adjusted to keep the estimate within the intended adult risk range.

Do I need bone density data?

No. You can calculate without BMD. If a femoral neck T-score or BMD value is available, adding it can make the estimate more specific.

What does the 3 percent hip threshold mean?

Many U.S. workflows review treatment when 10-year hip fracture probability reaches 3 percent. A clinician should interpret that threshold with the full health record.

Why does BMI matter?

BMI reflects body size. Lower body weight can be linked with higher fracture risk, so the calculator includes BMI as a core input.

Can this tool include falls?

Yes. Falls are included as an extra modifier. This keeps the tool practical, but the modifier is still an estimate and should be reviewed clinically.

What is the PDF download for?

The PDF gives a compact summary of inputs and results. It can help you keep records or prepare for a bone health appointment.

Can I make treatment decisions from this result?

No. Do not start, stop, or change treatment from this page. Use the result for education and discuss it with a qualified clinician.

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.