Here is a study that suggests 1)Regarding the mechanism of onset of straight, kyphosis,and S-shape curvature, muscular restraint from pain and degeneration of the joints are not the cause of S curves or kyphosis because the authors showed that pain intensity was similar among the groups and excluded subjects with degeneration in the present study. This again shows that muscle spasms is NOT the reason for a loss of the curve. 2) The authors conclude this "The results suggest that alterations in the static alignment of the cervical curvature cause alterations in the dynamic . . .
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