Neck Disability Index (NDI) score calculator
About the score:
Originally published in 1991 in the Journal of Manipulative and Physiological Therapeutics, the Neck Disability Index (NDI) is an instrument to measure patient-reported disability secondary to neck pain. It was developed utilizing the Oswestry Low Back Pain Index as a model and therefore, at the time of its creation, was distinguished from other simpler pain assessments by examining patient function with respect to activities of daily living.
The instrument has 10 items and patients rate their pain from 0 (no pain) to 5 (worst imaginable pain). Individual item responses are summed to a total score, where 0 points indicate no activity limitations and 50 points indicate complete activity limitation. This instrument may be useful in patients with chronic or acute onset neck pain and in patients with musculoskeletal complaints or with cervical radiculopathy.
Vernon, Howard, and Silvano Mior. “The Neck Disability Index: a study of reliability and validity.” Journal of manipulative and physiological therapeutics 14.7 (1991): 409-415.
Young, Brian A., et al. “Responsiveness of the Neck Disability Index in patients with mechanical neck disorders.” The Spine Journal 9.10 (2009): 802-808.
Young, Ian A., et al. “Reliability, construct validity, and responsiveness of the neck disability index, patient-specific functional scale, and numeric pain rating scale in patients with cervical radiculopathy.” American journal of physical medicine & rehabilitation 89.10 (2010): 831-839.
Vernon, Howard. “The Neck Disability Index: state-of-the-art, 1991-2008.” Journal of manipulative and physiological therapeutics 31.7 (2008): 491-502.
About the score developer:
Dr. Howard Vernon is a Professor at the Canadian Memorial Chiropractic College in Toronto, Ontario, Canada and is a clinical consultant to the NIH-funded Center of Excellence in Chiropractic Appropriateness at the RAND Corporation.
To view his publications, please visit PubMed.