The Influence of Trunk Bracing on Time, Spatial Parameters, Symmetry of Ground Reaction Force and Loading Rate in Adolescent Idiopathic Scoliosis

Abstract

Background: Adolescent Idiopathic Scoliosis (AIS) leads to change between body segments, right-left trunk symmetry and produce pathological gait pattern. The influence of trunk bracing on symmetry of ground reaction force components and loading rate on idiopathic scoliosis has not been well documented. Therefore, the aim of this study was to examine the effect of trunk bracing on symmetry of forces in adolescent with idiopathic scoliosis. Method: A total of 10 patients with AIS and 10 healthy subjects with comparable age, height and weight were recruited in this study. The force applied on the right and left sides in both groups of subjects were recorded by use of a Kistler force plate while walking. The peak of the vertical force (the first and second peaks) and the force applied on the leg in anteroposterior direction (progression and breaking forces) and mediolateral force were collected in this study. Results: The results of this study showed that there was a significant difference between the asymmetry index of anteroposterior force of normal and scoliotic patients (p = 0.05). Moreover, trunk bracing decreased asymmetry index of loading rate of scoliotic patients significantly (p = 0.042). There was no significant difference between the other examined kinetic variables. Conclusion: There are some degrees of asymmetry between the forces applied on the leg in scoliotic subjects. Orthosis decreased the forces applied on the leg in patients with scoliosis. Clinicians are to be aware of these findings as orthotic devices may be of value to patients with idiopathic scoliosis.