[Altered hip muscle activation in patients with chronic non-specific low back pain]

Schmerz. 2011 Apr;25(2):199-204, 206. doi: 10.1007/s00482-010-1010-3.
[Article in German]


Background: The aim of this study was to examine postural control in patients with chronic non-specific low back pain (CNRS). Furthermore the influence of visual information (eyes open versus eyes closed) was analyzed.

Material and methods: A total of 8 patients with CNRS and 12 healthy control subjects were examined. Surface electromyography (SEMG) recordings were made from 5 trunk and 5 lower limb muscles as well as one hip muscle during application of distal lateral perturbation.

Results: Healthy controls (mean ± standard deviation: 96.42±64.77 µV) showed a significantly higher maximum amplitude of the gluteus medius muscle in comparison to patients with CNRS (56.29±39.63 µV). Furthermore activation of several lower limb muscles was found to be dependent on visual information.

Conclusion: Patients showed an altered reflex response of the gluteus medius muscle which could be associated with reduced hip stability.

Publication types

  • English Abstract

MeSH terms

  • Adult
  • Back Pain / physiopathology*
  • Buttocks
  • Electromyography
  • Female
  • Functional Laterality / physiology
  • Hip / physiopathology*
  • Humans
  • Middle Aged
  • Muscle, Skeletal / physiopathology*
  • Postural Balance / physiology*
  • Posture / physiology*
  • Quadriceps Muscle / physiopathology
  • Reference Values
  • Reflex, Stretch / physiology
  • Signal Processing, Computer-Assisted