Direct pediculo-body fixation in cases of spondylolisthesis with advanced intervertebral disc degeneration

Abstract

In inveterate cases of grade 2-3 spondylolisthesis (degenerative or spondylolytic), segmental mobility may be reduced by radiologically confirmed disc resorption. Fusion may be indicated in patients with persistent pain. A simple technique for fusion without reduction of the spondylolisthesis is presented. Fixation of the segment is achieved by two cancellous bone screws inserted bilaterally through the pedicles of the lower vertebra into the body of the upper slipped, vertebra. The cases of 16 patients with an average follow-up of 31 months (range 24-27 months) treated with this direct pediculo-body fixation are presented. Clinical evaluation showed significant decrease in pain and, in patients with concomitant spinal stenosis, walking distance without pain improved from between 500 and 1000 m to more than 3000 m. Radiologically, fusion was observed in all cases. The presented technique of internal fixation of a slipped segment in the degenerative lumbar spine represents a simple minimally traumatic procedure with successful clinical and radiological outcome. Additional procedures, such as decompression of the spinal canal, may be performed.