Interobserver Reliability of Neck-Mobility Measurement by Means of the Flock-of-Birds Electromagnetic Tracking System

Despite the use of a standardized protocol and a sophisticated measurement system, the interobserver reliability of neck mobility was variable in quality, with reliability being good in rotation in neutral position, flexion-extension, and lateral bending. (J Manipulative Physiol Ther 2005;28:408-413)