• Niko Paalanne, Raija Korpelainen, Simo Taimela, Jouko Remes, Pertti Mutanen, and Jaro Karppinen.
• Department of Sports Medicine, Deaconess Institute of Oulu, Oulu, Finland. nikopaal@mail.student.oulu.fi
• Spine. 2008 Jun 1; 33 (13): E435-41.

Study DesignA cross-sectional study on young adults.ObjectiveTo evaluate the relationships between low back pain (LBP), maximal isometric trunk muscle strength, and body sway among young adults.Summary Of Background DataThe results of previous studies evaluating the association between trunk muscle strength and LBP are conflicting and heterogeneous. Furthermore, there are only few studies on the association between body sway and LBP.MethodsThe subjects (n = 874) belonged to a subcohort of the Northern Finland Birth Cohort 1986 (mean age 19 years). Trunk muscle strength and body sway were measured from all subjects. LBP symptoms were inquired with a questionnaire, which was completed concurrently with the examinations. Latent Class Analysis (LCA) was used to cluster the subjects according to their LBP symptoms.ResultsLCA analysis produced 6 clusters differing with respect to LBP symptoms. There were no statistically significant differences between the clusters in trunk muscle strength or body sway.ConclusionLBP does not seem to be associated with maximal isometric trunk muscle strength or body sway in young adults.

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