How does asymmetry of shoulder height affect cervical rotation?

Abstract

[Purpose] It was said that cervical rotation is very important for deskwork. In this study, we investigated cervical rotation to see if there were differences between L-R heights of acromions. [Subjects] Subjects were 13 healthy adult males. [Methods] The distance between the spinous process and scapula were measured in a neutral position, 20 degrees right rotation and 20 degrees left rotation. L-R height differences of acromions and distances between the spinous process and scapula were analyzed using correlation coefficients. [Results] The lower the right acromion was relative to the left one, the greater the distance between the cervical spinous process and the scapula moved to the left at 20 degrees right rotation. Similarly, the higher the right acromion was relative to the left one, the greater the spinous process of the thoracic spine moved to the right at 20 degrees left rotation. [Conclusion] The greater the L-R height difference of the acromions, the more the cervical and thoracic spine moved to the lower side.