The posterior lumbar ramus: CT-anatomic correlation and propositions of new sites of infiltration.

Background And Purpose: Lumbar zypapophyseal joints are innervated by the medial branch of the posterior lumbar ramus. The aim of this work was to describe the precise course of the medial ramus on axial CT scans and to define a precise location for its selective infiltration.

Methods: Lumbar spines of two cadavers were first dissected to assess the route of the L1-L5 posterior ramus.