Fig. 2

Schematic diagram of the surgical operation through the Wiltse approach. (A) Incision of thoracolumbar fascia is made from the side of the multifidus and longissimus. (B) Placement of retractor between multifidus and longissimus muscle. (C) Facet joints and laminae are removed to reveal the intervertebral disc. (D) Fixation of the rod and screws