Cervical spine range-of-motion has been well quantified for active voluntary efforts in primarily single degrees-of-freedom (e.g., flexion-extension, lateral bending, and axial rotation) [1], but not for combined movements that are possibly morerepresentative of the activities of daily living (e.g., flexion-extension in presence of axial rotation). The purpose of this study was to test the hypothesis that axial rotation limits the flexion-extension range-of-motion of the cervical spine.
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