On the relationship between pain intensity and postural sway in patients with non-specific neck pain.
BACKGROUND
Increased center of pressure excursions are well documented in patients with non-specific neck pain. While a linear relationship between pain intensity and postural sway has been described in low back pain patients, no such investigation has been conducted in adults with non-specific neck pain.


METHODS
Seventy patients with non-specific neck pain and a matching number of healthy controls were enrolled. Center of pressure parameters were measured by three static bipedal standing tasks of 90 sec duration each with eyes closed on a force platform. The pain intensity was assessed by a numeric rating scale (NRS), an equal number of patients (n=10) was enrolled per pain score.


RESULTS
The results confirmed an increased postural sway in pain sufferers compared to healthy controls. In addition, a significant and linear increase in postural sway was observed with higher pain ratings. Statistically significant changes in sway were reached with an incremental change in NRS scores of two to three points.


CONCLUSIONS
Mean velocity and sway area are closely related to self-reported pain scores in neck pain patients. This relationship has implications for clinical applications such as an objective monitoring tool for patients under treatment or rehabilitation.
School of Health Professions, Murdoch University, Murdoch, Western Australia, Australia.
Alexander
A
Ruhe
René
R
Fejer
Bruce
B
Walker
D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D019547:Neck Pain / Q000175:diagnosis* / Q000503:physiopathology; D004856:Postural Balance / Q000502:physiology*; D011187:Posture / Q000502:physiology*; D015203:Reproducibility of Results; D012720:Severity of Illness Index
Postural sway; center of pressure; force-plate; neck pain; pain intensity