The purpose of this study was to quantify mechanical strain in the vertebral artery while simultaneously capturing motion analysis data during passive movements of the head and neck relative to the trunk during spinal manipulation and cardinal planes of motion on cadavers. This study found that manipulation was less stressful on the VA than cervical passive end ranges of motion, and strain from both ROM and cervical manipulation was well below published VA failure rates.
In OPSMC26, cervical manipulation techniques are performed with as little at 15 degrees of rotation while in an open packed position. This technique drastically reduces any complications that can normally be associated with cervical manipulation making it a preferred technique for safety and patient comfort.
Piper SL,Howarth SJ, Triano J, Herzog W. Quantifying strain in the vertebral artery with simultaneous motion analysis of the head and neck: A preliminary investigation. Clinical Biomechanics 2014;29:1099-1107.