Abstract
Three cases previously treated with intrasacral fixation (Jackson technique) were reviewed. Two cases were L5 isthmic spondylolisthesis, 1 case was L4 and L5 degenerative spondylolisthesis, and their degrees of slip rate were over 25 degrees. Both PLIF and PLF, one had only PLF. Liberty spinal system was applied for intrasacral fixation. All of them had obtained bony fusion. Their low back pain and leg pain disappeared. The surgical technique of contouring of stiff rods and attaching to the spine with screws was too difficult to reduce their slip.