Index to Chiropractic Literature
Index to Chiropractic Literature
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ID 23608
  Title Effect of changing lumbar stiffness by single facet joint dysfunction on the responsiveness of lumbar muscle spindles to vertebral movement
Journal J Can Chiropr Assoc. 2014 Jun;58(2):160–169
Peer Review Yes
Publication Type Article

OBJECTIVE: Individuals experiencing low back pain often present clinically with intervertebral joint dysfunction. The purpose of this study was to determine whether relative changes in stiffness at a single spinal joint alters neural responsiveness of lumbar muscle spindles to either vertebral movement or position.

METHODS: Muscle spindle discharge was recorded in response to 1mm L6 ramp and hold movements (0.5mm/s) in the same animal for lumbar laminectomy-only (n=23), laminectomy & L5/6 facet screw (n=19), laminectomy & L5/6 facetectomy (n=5) conditions. Mean instantaneous frequency (MIF) was calculated for the ramp-up, hold, ramp-down and post-ramp phases during each joint condition.

RESULTS: Mean MIFs were not significantly different between the laminectomy-only and the other two types of joint dysfunction for the ramp-up, hold, ramp-down, or post-ramp phases.

CONCLUSION: Stiffness changes caused by single facet joint dysfunction failed to alter spindle responses during slow 1mm ramp and hold movements of the L6 vertebra.

OBJECTIF: La lombalgie se manifeste souvent cliniquement sous forme de dysfonction articulaire intervertébrale. Cette étude a pour objet de déterminer si des changements relatifs dans la rigidité d’une seule articulation vertébrale modifieraient la réactivité des fuseaux musculaires lombaires envers le mouvement ou la position des vertèbres.

MÉTHODOLOGIE: Les décharges des fuseaux musculaires ont été notées en réponse à des mouvements de rampe et de maintien de 1 mm à L6 (0,5 mm/s) chez le même animal pour le groupe laminectomie lombaire seulement (n=23), laminectomie et vis translaminofacettaire L5/6 (n=19), laminectomie et facettectomie L5/6 (n=5). La fréquence instantanée moyenne (FIM) a été calculée pour les phases d’intensification, de maintien, d’atténuation et post-rampe pour chacun des groupes.

RÉSULTATS: Les FIM n’étaient pas significativement différentes entre le groupe laminectomie seule et les deux autres types de dysfonction articulaires pour les phases d’intensification, de maintien, d’atténuation et post-rampe.

CONCLUSION: Les changements de rigidité causés par une dysfonction articulaire à facette unique n’ont pas réussi à modifier la réponse des fuseaux au cours de mouvements lents de rampe et de maintien de 1 mm de la vertèbre L6.

This abstract is reproduced with the permission of the publisher. Click on the above link for free full text.


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