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Purpose Smartphone use reportedly changes posture. However, how neck posture is altered in smartphone users with neck pain is unknown. This study examined changes in the posture of young adults with and without mild neck pain (MNP) when using a smartphone. Subjects Thirteen control subjects and 14 subjects with MNP who used smartphones were recruited. Methods The upper cervical (UC) and lower cervical (LC) angles in the sagittal plane were measured using an ultrasound-based motion analysis system while the seated subjects used a smartphone for 5 min. Results During smartphone use, the MNP group exhibited greater UC and LC flexion angles than the control group. Conclusion These findings suggest that young adults with MNP are more careful and more frequently utilize a neutral neck posture than young adults without MNP when using a smartphone while sitting.
Man-Sig Kim (2015) studied this question.