1. A long-term follow-up of thirty-three patients with symptomatic spondylolisthesis treated by posterior-element resection and nerve-root decompression is presented.
2. Significant progression of slipping did not occur in the postoperative period.
3. The procedure would seem to be of most benefit to the adult patient with symptomatic spondylolisthesis whose preoperative pain pattern reflects nerve-root compression.
4. The simplicity of performance, the minimum postoperative morbidity, and the patients' rapid return to functional status are attractive features.
5. Satisfactory results in symptomatic spondylolisthesis can be achieved by the Gill procedure in selected patients.