Many activities of daily living (ADL) require dorsiflexion of the neck. We assessed the impact of changes in neck dorsi-flexion on dietary activitiy. We measured the angles of neck dorsiflexion produced by various postures and containers used during drinking. The dorsiflexion angle is defined as the angle made between the 2nd and 7th cervical vertebrae and is expressed as the difference between the respective angle measurement and that of matural upright posture. Concerning the effect of posture, sitting on a chair is most suitable for patients with neck spondylosis, and, in case of the Japanese life style, it is preferable to sit on a folding chair. Sitting cross-legged is a parhcularly bad posture in this regard. As to the type of containes, cups which we developed were the best, followed by cone shaped glasses. The worst container tested was a car. Therefore, cervical spondylosis patients should avoid drinking beverages directly from a can.
