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.
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.
Authors: R E Thompson; M J Pearcy; K J Downing; B A Manthey; I H Parkinson; N L Fazzalari Journal: Spine (Phila Pa 1976) Date: 2000-12-01 Impact factor: 3.468
Authors: Dong-Yuan Cao; William R Reed; Cynthia R Long; Gregory N Kawchuk; Joel G Pickar Journal: J Manipulative Physiol Ther Date: 2013-02 Impact factor: 1.437
Authors: Carla R Lima; Randall S Sozio; AaMarryah C Law; Alicia J Nelson; Harshvardhan Singh; Christopher P Hurt; Peng Li; William R Reed Journal: J Manipulative Physiol Ther Date: 2021-06-05 Impact factor: 1.300