The Influence of Pelvic Asymmetry on Trunk Symmetry Among Children.

Abstract

Background: Pelvic asymmetry and accompanying postural defects tend to become more common with age. The school period, which is associated with spending more time in a sitting position and daily activities performed with the dominant limb, may contribute to this.

Material and methods: We examined 22 children (12 girls, 10 boys) aged 7 years. The same group was re-examined two years later. Pelvic asymmetry was identified by assessing the position of the iliac spines. The indicator of trunk asymmetry was the trunk rotation angle (TRA) measured with a Bunnel scoliometer within the spinous processes on the upper thoracic vertebra, apex of thoracic kyphosis, thoracolumbar junction, lumbar spine, and (if present in patients) the greatest deformity (rib hump, hump in the lumbar region).

Results: Pelvic asymmetry was detected in 14 children at the age of 7 years compared to 16 in the same group of patients aged 9 years. During these two years, the prevalence of trunk asymmetry in children with an oblique/rotated pelvis had increased. The progression of trunk asymmetry with an oblique position of the pelvis was most marked in the lumbar region. In children with symmetrical pelvis, the most marked increase in TRA was recorded in the thoracic segment.

Conclusions: 1. The development of pelvic girdle asymmetry is influenced by the increasing number of asymmetrically performed movements and asymmetric body positions assumed, which increase in number with age. 2. The most marked increase in asymmetry of the spine in subjects with an oblique/rotated pelvis was seen in the lumbar spine, which proves an association of the former with tilting of the pelvic girdle. 3. Asymmetry is a dynamic process. When ignored, this postural defect progresses significantly and there may be compensatory changes in neighbouring systems.