1. Introduction. A significant correlation between handedness and laterality of the curve in scoliotic children is reported in the literature. This correlation is implicating cortical function as an aetiologic factor for scoliosis, (Goldberg and Dowling 1990). The truncal asymmetry expressed as a hump, is the sign at the presence of which there is a suspicion of a scoliotic curve. The above issue stimulated the search of existence of a possible correlation between handedness and the increasing truncal asymmetry, the existence of which represents a risk factor for development of scoliosis. Thus the aim of this study is the appraisal of the correlation of the existence of a truncal asymmetry as it is checked by the use of a scoliometer during the forward bending test and the handedness in schoolmates who were screened at school for scoliosis.

2. Material and Method

2.1 The examined children. 4345 students (2183 girls and 2158 boys), 6 – 18 years of age were examined during the school-screening program for scoliosis.

2.2 The measurements. A protocol with a checklist is filled for each student in which handedness and truncal asymmetry is included. The probability of existence of scoliosis in the child and the recommendation for further clinical and radiological assessment at hospital is based on the amount of the recorded truncal asymmetry. The sitting and standing forward bending test is performed using the Pruijs scoliometer, on which reading ≥7° is a threshold for recommendation for reexamination. Truncal asymmetry was recorded for thoracic, thoracolumbar and lumbar region.

2.3 The statistical analysis. The techniques used for the study of the sample of children included cross tabulation and ÷2.

3. Results. The statistical analysis revealed that there is no statistical difference for handedness between boys and girls therefore the correlation between handedness and truncal asymmetry was performed for both sexes together. 91% children were right-handed (1932 boys and 1996 girls), while 9% left-handed (218 boys and 169 girls) respectively. A significant statistical correlation of truncal asymmetry and handedness was found both in boys and girls at thoracic (p < 0.022) and thoracolumbar (p< 0.027), but not at the lumbar region.

4. Discussion. These findings show that there is significant correlation of truncal asymmetry and the dominant brain hemisphere in terms of handedness, in children who are entitled at risk to develop scoliosis. Thus, the correlation of the handedness and the truncal asymmetry (the scoliosis convex) is present not only at scoliotic children but and at those being at risk that is before the development of the disease. These findings correlate cortical function and the truncal asymmetry, probably as a prodrome state of scoliosis and it is of aetiologic importance.