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Sacroiliac joint manipulation decreases the H-reflex

B A Murphy1, N J Dawson, J R Slack

  • 1Department of Physiology, School of Medicine, University of Auckland, New Zealand.

Electromyography and Clinical Neurophysiology
|March 1, 1995
PubMed
Summary

Sacroiliac joint manipulation significantly decreases Hoffman reflex amplitude in the ipsilateral leg, indicating physiological effects on the central nervous system. These changes likely involve joint and muscle afferents, not skin receptors.

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Area of Science:

  • Neuroscience
  • Physiology
  • Musculoskeletal Medicine

Background:

  • Joint manipulation is a common clinical practice for pain relief and improving joint mobility.
  • The underlying physiological mechanisms of joint manipulation, particularly on the nervous system, require further elucidation.

Purpose of the Study:

  • To investigate the effect of sacroiliac joint manipulation on the Hoffman (H) reflex amplitude.
  • To explore the afferent pathways involved in the reflex changes induced by sacroiliac joint manipulation.

Main Methods:

  • Surface electromyography (EMG) was used to record H-reflexes from the soleus muscle in response to tibial nerve stimulation.
  • H-reflex amplitudes were compared before and after sacroiliac joint manipulation or a sham procedure.
  • Experiments were repeated with local anesthetic applied to the sacroiliac joint area to assess the role of cutaneous afferents.

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Main Results:

  • Sacroiliac joint manipulation significantly decreased ipsilateral H-reflex amplitude by 12.9% (p < 0.001).
  • No significant changes in H-reflex amplitude were observed after the sham procedure or in the contralateral leg.
  • The decrease in H-reflex amplitude persisted (10.6%) even when cutaneous afferents were anesthetized, suggesting non-cutaneous mediation.

Conclusions:

  • Joint manipulation induces physiological effects on the central nervous system, likely at the segmental level.
  • The findings suggest that joint and/or muscle afferents, rather than cutaneous afferents, mediate the observed reflex changes.
  • This study provides evidence for the neurophysiological impact of sacroiliac joint manipulation.