Surgical Technique and Results of Double-door Laminoplasty at the Cervical Spine (Kurokawa's Method)-Focusing on the Change of Sagittal Alignment : Figure 2

Figure 2: Formation of longitudinal groove (partially modified [13], permitted by MIWA-SHOTEN Ltd.)
A longitudinal groove of 3 mm in width is made bilaterally at the lamina-facet junction line by resecting the outer cortex and a part of cancellous bone.