Postural balance, visual verticality perception, and its association in individuals with and without neck pain.

Objective: To compare postural balance and visual verticality perception between neck pain and asymptomatic subjects; to determine its association within groups.

Material And Method: Fourteen neck pain and 14 asymptomatic subjects participated in the study. Subjects stood on a force platform to measure the displacement of the center of pressure in the medial-lateral and anterior-posterior directions, total path length, and sway velocity.