1. What is the Oswestry Neck Disability Index?

The Oswestry Neck Disability Index (NDI) is a validated questionnaire used to measure neck pain and disability. It assesses how neck pain affects daily activities and provides a percentage score indicating the level of disability.

2. How Does the Calculator Work?

The calculator uses the NDI formula:

Where:

• \( \text{Score} \) — Total score from NDI questionnaire (0-50)
• \( \text{NDI %} \) — Neck disability percentage (0-100%)

Explanation: The formula converts the raw score from the 10-item questionnaire into a percentage that represents the level of neck-related disability.

3. Importance of NDI Calculation

Details: The NDI is widely used in clinical practice and research to assess treatment outcomes, monitor progress, and determine the impact of neck pain on functional abilities.

4. Using the Calculator

Tips: Enter the total score obtained from the NDI questionnaire (range 0-50). The score should be the sum of all 10 sections, with each section scored from 0 to 5.

5. Frequently Asked Questions (FAQ)

Q1: What do the NDI percentage scores mean?
A: 0-20% = minimal disability, 21-40% = moderate disability, 41-60% = severe disability, 61-80% = crippled, 81-100% = bed-bound or exaggerating symptoms.

Q2: How is the NDI questionnaire structured?
A: The NDI consists of 10 sections: pain intensity, personal care, lifting, reading, headaches, concentration, work, driving, sleeping, and recreation.

Q3: What is a clinically significant change in NDI score?
A: A change of 10 percentage points or 5 raw score points is generally considered clinically significant.

Q4: Can NDI be used for all neck conditions?
A: Yes, NDI is validated for various neck conditions including cervical radiculopathy, whiplash, degenerative disc disease, and post-surgical evaluation.

Q5: How often should NDI be administered?
A: Typically at initial assessment and then at regular intervals (e.g., 4-6 weeks) to monitor treatment progress and outcomes.