title: Patterns of lumbar region movement during trunk lateral bending in 2 subgroups of people with low back pain.
abstract: OBJECTIVE
  The movement system impairment (MSI) system is one proposed system for classifying low back pain (LBP) problems. Prior clinical data and observations for the MSI system suggest that different LBP subgroups demonstrate different patterns of movement during clinical tests, such as trunk lateral bending (TLB). The purpose of this study, therefore, was to examine the validity of the observation that lumbar region (LR) movement patterns during TLB are different between 2 subgroups of people with LBP: lumbar rotation with extension (Rotation With Extension) and lumbar rotation (Rotation).
  
  
  METHODS
  Participants were 44 people (28 men and 16 women; age [X+/-SD], 28.5+/-8.4 years) with chronic or recurrent LBP.
  
  
  METHODS
  Each participant's LBP problem was classified with the MSI system. Kinematic variables were measured, and LBP symptoms were recorded during the TLB test.
  
  
  RESULTS
  People in the 2 LBP subgroups demonstrated different patterns of LR movement during TLB. People in the Rotation With Extension subgroup displayed an asymmetric (right versus left) pattern of LR movement across the TLB movement, whereas people in the Rotation subgroup displayed a symmetric pattern of LR movement. Equal proportions of people in the 2 subgroups reported an increase in symptoms with the TLB test.
  
  
  CONCLUSIONS
  The patterns of LR movement across the TLB movement were different in 2 subgroups of people with LBP. The difference in the LR movement patterns between subgroups may be an important factor to consider in specifying the details of the interventions for these 2 LBP problems.
authors: Washington University School of Medicine, Campus Box #8502, 4444 Forest Park Blvd, St Louis, MO 63110, USA. spgombat@artsci.wustl.edu
authors: Sara P
authors: SP
authors: Gombatto
authors: David R
authors: DR
authors: Collins
authors: Shirley A
authors: SA
authors: Sahrmann
authors: Jack R
authors: JR
authors: Engsberg
authors: Linda R
authors: LR
authors: Van Dillen
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D005260:Female; D006801:Humans; D017116:Low Back Pain / Q000145:classification*; D008297:Male; D014102:Torsion Abnormality