Background and Aim: Changes in the normal posture of different parts of the spine can negatively influence the balance control. Because of deformities such as scoliosis, lordosis and kyphosis in spine alignment, line of gravity does not pass from predetermined points, and the body will oscillate. The purpose of the current study was to compare the postural control ability in 10-12 years old boys with spinal sagittal plane deformities.

Material and Methods: In this descriptive-analytical study, after the primary screening and spine kyphosis and lordosis measurement in 417 students, a sample of students with deformity (n=88, mean age: 11.257 years, mean weight: 49.147 kg, and mean height: 155.58 cm) were randomly selected and equally distributed in 4 groups of hyperkyphosis, hypokyphosis, hyperlordosis and hypolordosis. Amount of spine curvatures were measured by flexicurve, and static and dynamic balance were measured by single leg balance test and star excursion balance tests respectively. Using SPSS version 16, data analysis was performed by ANOVA and Bonferronii tests.

Results: Results showed lower static and dynamic postural control in hyperkyphosis group compared to hypokyphosis and hyperlordosis groups. Also, we found a significantly higher static and dynamic postural control in hyperkyphosis group in comparison to hypolordosis group, but there was no significant difference between hyperlordosis and hypolordosis groups (P>0.05).

Conclusion: Based on the results of this study, the effect of hyperkyphosis was more than that of hyperlordosis. But the effect of hypokyphosis on postural control was less, compared to hypolordosis.

Keywords: Postural control, Deformity, Sagittal plane, Kyphosis, Lordosis

Received: Oct 26, 2015      Accepted: Jan 10, 2016