Clinical and Kinematic Assessment for Determination of Botox® Injection Parameters in Cervical Dystonia

This study investigates the use of a kinematic measurement device to quantify the abnormal head movements and postures in patients with cervical dystonia (CD) in order to individualize and optimize botulinum toxin type A (BoNT-A) injection therapy. A single sensor captures five degrees of freedom of the neck and head that distinguish which muscle(s) contribute to CD and the amount of BoNT-A to inject into these muscle(s). The efficacy, relief and improvements in social, occupation and function by injections will be investigated. The efficacy of BoNT-A therapy using either BoNT-A injection parameters from clinical-based assessments and kinematically-based assessments will be investigated in CD patients. Individuals clinically diagnosed with CD will be randomized for two treatment conditions: A) injection parameters from a kinematic assessment only, or B) injection parameters from a clinical assessment only.