Trunk and center of mass movements during gait in children with juvenile idiopathic arthritis

Authors: Broström, E.W., Örtqvist, M., Haglund-Åkerlind, Y., Hagelberg, S., Gutierrez-Farewik, E.M.
Document Type: Article
Pubstate: Published
Journal: Human Movement Science
Volume: 26   296-305
Year: 2007


Motion of the body center of mass (CoM) can often indicate the overall effect of the strategy of forward progression used. In the present study, focus is placed on trunk movements in sagittal, coronal, and transverse/rotation plane, as well as placement of the CoM, during gait in children with juvenile idiopathic arthritis (JIA). Seventeen children with JIA, all with polyarticular lower extremity involvement were examined before and approximately 2 weeks after treatment with intra-articular cortico-steroid injections. Movement was recorded with a 6-camera 3D motion analysis system in both the children with JIA and in 21 healthy controls. Trunk and center of mass movement were compared between JIA and controls, and effects of intra-articular cortico-steroid treatment were evaluated. Children with JIA are more posteriorly tilted in the trunk, contrary to the common clinical impression, and have their CoM placed more posterior and off-centred, which may be a result of pain. With such knowledge, it might be possible to understand better the effects of their pain and involvement, and ultimately to plan a treatment strategy for improving their gait patterns.