"Localization of the facet joint." Localization of the facet joint is as follows. The spinous process of the thoracic spine usually lies at the level of the caudal facet joint. Thus, a T6 spinous process is approximately at the level of the T7-T8 facet joint. This helps in localization of the thoracic facet. Also, notice the overhang which allows for easy dissection of the facet joint above, and the facet joint below.
Sarwahi et al. Scoliosis 2011 6:16 doi:10.1186/1748-7161-6-16