In Vivo Human Facet Joint Gapping During Cervical Spine Manipulation

1William Anderst PhD,
1Tom Gale MS, 2Kris Gongaware DC and 2Michael Schneider DC, PhD
1Department of Orthopaedic Surgery and 2Department of Physical Therapy
University of Pittsburgh, Pittsburgh, PA, USA (bdl.pitt.edu)

  • This study demonstrates our ability to characterize facet gapping, believed to be one of the key mechanical events of spinal manipulation.
  • Cervical manipulation induces supraphysiologic facet joint gapping, evidenced by a peak
    facet gap during manipulation that is more than double the peak facet gap during full
    range of motion flexion/extension.
  • Future work will investigate the relationship between mechanical events, such as facet
    gapping and applied forces, and the mechanical and/or neurologic responses that lead to
    positive clinical outcome

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