Orthopaedics What constitutes a spinal motion segment? A A disc and the facet joints at that level. B A disc and the vertebrae above and below, including their interlocking facet joints. C A section of the spine involved in a physiological curve with the similar function (i.e. thoracic kyphosis). D A vertebral body and the disc above. 💡 Explanation What constitutes a spinal motion segment? ✓ Correct Answer: B. A disc and the vertebrae above and below, including their interlocking facet joints.