RESUMEN
The authors reported 16 cases of first to third grade painful spondylolisthesis. The treatment was posterior reduction and stabilization in one stage operation by modified Vidal et al and Luque techniques. The operation consisted of stabilization of an above involved vertebra and another one below with a rectangular rod and sublaminar wirings. The pedicular screws were inserted through the Harrington hooks which levered upon the rectangular rod for reduction of the displaced vertebra. The posterolateral intertransverse arthrodesis of two spinal segments was also added. A 2-5-year follow-up study showed all patients were relieved from pain initially, and could ambulate early following the operation. The vertebral displacement did not increase postoperatively and solid posterolateral fusion was obtained.