Abnormal Instantaneous Axes of Rotation in Patients with Neck PainAmevo, Barra, MB BS*; Aprill, Charles, MD†; Bogduk, Nikolai, MB BS, PhD‡Spine: July 1992 - Volume 17 - Issue 7 - p 748–756 Articles: PDF Only Buy Abstract Author InformationAuthors Instantaneous axes of rotation for cervical motion segments C2–3 to C6–7 were determined in 109 patients with uncomplicated neck pain. Their location in each patient was compared to normal ranges determined in a previous study of 46 asymptomatic individuals. Unequivocally abnormal instantaneous axes of rotation were found in 46% of patients, and marginally abnormal instantanaous axes of rotation were found in a further 26% of patients. Abnormal instantaneous axes of rotation significantly correlated with the presence of neck pain, but the location of an abnormal axis did not correlate with the segmental source of pain as determined by provocation discography or zygapophyseal joint blocks. * Department of Basic Medical Sciences, Faculty of Medicine, University of Papua New Guinea, Port Moresby, Papua New Guinea. † Diagnostic Conservative Management, New Orleans, Louisiana. ‡ Faculty of Medicine, University of Newcastle, Australia. © Lippincott-Raven Publishers.