OBJECTIVE: To compare a tape-based tool for measuring cervical mobility in patients with ankylosing spondylitis (AS) with the widely practiced goniometer-based approach. METHODS: We developed a novel tape-based approach to measurement of lateral cervical rotation of the neck that is minimally affected by flexion/extension movements of the neck. This requires measurement of the difference between a mark at the suprasternal notch and the tragus of the ear. Rotation score is measured in centimeters and constitutes the