This simplified calculator estimates your 10-year probability of major osteoporotic fracture based on common risk factors. It is not the official WHO FRAX tool and should not be used for medical diagnosis or treatment decisions. Consult a healthcare professional for an accurate assessment.
Female
Male
/* Basic styling for the calculator */
.frax-calculator-container {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
background-color: #f9f9f9;
border: 1px solid #ddd;
border-radius: 8px;
padding: 20px;
max-width: 700px;
margin: 20px auto;
box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}
.frax-calculator-container h2 {
color: #333;
text-align: center;
margin-bottom: 20px;
}
.frax-calculator-container p {
color: #555;
line-height: 1.6;
margin-bottom: 15px;
}
.calculator-input-group {
margin-bottom: 15px;
display: flex;
flex-wrap: wrap;
align-items: center;
}
.calculator-input-group label {
flex: 1;
min-width: 180px;
margin-right: 10px;
color: #444;
font-weight: 500;
}
.calculator-input-group input[type="number"],
.calculator-input-group select {
flex: 2;
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
max-width: 150px;
}
.calculator-input-group input[type="radio"] {
margin-left: 10px;
margin-right: 5px;
}
.calculator-input-group input[type="radio"] + label {
flex: unset;
min-width: unset;
margin-right: 15px;
}
.frax-calculator-container button {
display: block;
width: 100%;
padding: 12px 20px;
background-color: #007bff;
color: white;
border: none;
border-radius: 5px;
font-size: 18px;
cursor: pointer;
margin-top: 20px;
transition: background-color 0.3s ease;
}
.frax-calculator-container button:hover {
background-color: #0056b3;
}
.calculator-result {
margin-top: 25px;
padding: 15px;
background-color: #e9f7ef;
border: 1px solid #d4edda;
border-radius: 5px;
color: #155724;
font-size: 1.1em;
text-align: center;
font-weight: bold;
}
.calculator-result.error {
background-color: #f8d7da;
border-color: #f5c6cb;
color: #721c24;
}
.frax-article-content {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
max-width: 700px;
margin: 40px auto;
line-height: 1.6;
color: #333;
}
.frax-article-content h3, .frax-article-content h4 {
color: #007bff;
margin-top: 25px;
margin-bottom: 15px;
}
.frax-article-content ul {
list-style-type: disc;
margin-left: 20px;
margin-bottom: 15px;
}
.frax-article-content li {
margin-bottom: 5px;
}
.frax-article-content strong {
color: #0056b3;
}
function calculateFraxScore() {
var age = parseFloat(document.getElementById('age').value);
var sex = document.getElementById('sex').value;
var weight = parseFloat(document.getElementById('weight').value);
var height = parseFloat(document.getElementById('height').value);
var prevFracture = document.querySelector('input[name="prevFracture"]:checked').value;
var parentHipFracture = document.querySelector('input[name="parentHipFracture"]:checked').value;
var smoker = document.querySelector('input[name="smoker"]:checked').value;
var glucocorticoids = document.querySelector('input[name="glucocorticoids"]:checked').value;
var ra = document.querySelector('input[name="ra"]:checked').value;
var secondaryOsteo = document.querySelector('input[name="secondaryOsteo"]:checked').value;
var alcohol = document.querySelector('input[name="alcohol"]:checked').value;
var resultDiv = document.getElementById('fraxResult');
resultDiv.className = 'calculator-result'; // Reset class
// Input validation
if (isNaN(age) || age 90) {
resultDiv.innerHTML = 'Please enter a valid age between 40 and 90 years.';
resultDiv.classList.add('error');
return;
}
if (isNaN(weight) || weight 200) {
resultDiv.innerHTML = 'Please enter a valid weight between 30 and 200 kg.';
resultDiv.classList.add('error');
return;
}
if (isNaN(height) || height 220) {
resultDiv.innerHTML = 'Please enter a valid height between 100 and 220 cm.';
resultDiv.classList.add('error');
return;
}
var totalPoints = 0;
// Age points
if (age >= 80) {
totalPoints += 6;
} else if (age >= 70) {
totalPoints += 4;
} else if (age >= 60) {
totalPoints += 2;
}
// Sex points
if (sex === 'female') {
totalPoints += 2;
}
// BMI points
var heightM = height / 100; // Convert cm to meters
var bmi = weight / (heightM * heightM);
if (bmi = 25 && bmi = 30) {
totalPoints -= 2;
}
// Risk factor points
if (prevFracture === 'yes') {
totalPoints += 3;
}
if (parentHipFracture === 'yes') {
totalPoints += 2;
}
if (smoker === 'yes') {
totalPoints += 2;
}
if (glucocorticoids === 'yes') {
totalPoints += 3;
}
if (ra === 'yes') {
totalPoints += 3;
}
if (secondaryOsteo === 'yes') {
totalPoints += 3;
}
if (alcohol === 'yes') {
totalPoints += 1;
}
// Define min and max possible points for normalization
var minPossiblePoints = -2; // (age 30, all 'no' for risk factors)
var maxPossiblePoints = 28; // (age 80+, female, BMI < 18.5, all 'yes' for risk factors)
// Map points to a 10-year probability percentage (e.g., 1% to 35%)
var normalizedPoints = totalPoints – minPossiblePoints;
var totalRange = maxPossiblePoints – minPossiblePoints;
var maxRiskPercentage = 35;
var minRiskPercentage = 1;
var fraxPercentage = ((normalizedPoints / totalRange) * (maxRiskPercentage – minRiskPercentage)) + minRiskPercentage;
// Ensure percentage is within defined bounds
fraxPercentage = Math.max(minRiskPercentage, Math.min(maxRiskPercentage, fraxPercentage));
fraxPercentage = fraxPercentage.toFixed(1); // One decimal place
var interpretation = '';
if (fraxPercentage = 5 && fraxPercentage < 15) {
interpretation = 'Your estimated risk is moderate. Discuss these factors with your doctor.';
} else {
interpretation = 'Your estimated risk is elevated. It is highly recommended to consult your doctor for a comprehensive bone health assessment.';
}
resultDiv.innerHTML = 'Estimated 10-Year Major Osteoporotic Fracture Risk: ' + fraxPercentage + '%' + interpretation;
}
Understanding the FRAX Score
The FRAX (Fracture Risk Assessment Tool) score is a widely used clinical tool developed by the World Health Organization (WHO) to estimate an individual's 10-year probability of hip fracture and major osteoporotic fracture (clinical spine, forearm, hip, or shoulder fracture).
Why is FRAX Important?
Osteoporosis is a condition characterized by weakened bones, making them more susceptible to fractures. These fractures, particularly hip fractures, can lead to significant pain, disability, and even reduced life expectancy. The FRAX score helps healthcare professionals identify individuals at high risk of fracture who might benefit from preventive measures or treatment for osteoporosis, even before a fracture occurs.
Factors Considered by FRAX
The official FRAX tool considers several clinical risk factors, including:
Age: Risk increases with age.
Sex: Women generally have a higher risk than men.
Weight and Height: Low Body Mass Index (BMI) is associated with increased risk.
Previous Fracture: A prior fracture significantly increases the risk of future fractures.
Parental History of Hip Fracture: A family history of hip fracture indicates a genetic predisposition.
Current Smoking: Smoking is detrimental to bone health.
Glucocorticoid Use: Long-term use of oral glucocorticoids (steroids) can weaken bones.
Rheumatoid Arthritis: This autoimmune disease can increase fracture risk.
Secondary Osteoporosis: Conditions like Type 1 diabetes, hyperthyroidism, or chronic liver disease can contribute to bone loss.
Alcohol Consumption: Excessive alcohol intake (3 or more units daily) is a risk factor.
Femoral Neck Bone Mineral Density (BMD): While not included in this simplified calculator, the official FRAX tool can incorporate BMD T-scores for a more precise assessment.
How to Use This Simplified Calculator
To use this calculator, simply input your personal data into the fields provided. Select 'Yes' or 'No' for each risk factor that applies to you. Once all relevant information is entered, click the 'Calculate FRAX Score' button to get an estimated 10-year major osteoporotic fracture risk percentage.
Interpreting Your Results (Simplified Model)
The percentage displayed represents your estimated 10-year probability of experiencing a major osteoporotic fracture. Keep in mind that this is a simplified model and not the official WHO FRAX tool. The actual FRAX algorithm is more complex and incorporates country-specific epidemiological data.
Low Risk (e.g., below 5%): A lower percentage suggests a lower probability of fracture.
Moderate Risk (e.g., 5% to 15%): A moderate percentage indicates that you should discuss your bone health with your doctor.
Elevated Risk (e.g., above 15%): A higher percentage suggests a significant risk, and a comprehensive medical evaluation for osteoporosis prevention and treatment is strongly recommended.
Important Disclaimer: This calculator is for informational purposes only and provides a simplified estimate. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult with a qualified healthcare provider for any health concerns or before making any decisions related to your health or treatment.