The long-term results of spinal arthrodesis were evaluated in fourteen
children and adolescents who had severe spondylolisthesis. Twelve patients
had an in situ posterior arthrodesis and the other two had, in addition,
open reduction. The two patients who had open reduction lost correction
when the rods were removed. At long-term follow-up, which averaged 11.9
years, all patients had a solid fusion and their activities were
unrestricted. Two patients were dissatisfied with the cosmetic result. No
intraoperative or postoperative complications occurred in association with
the in situ arthrodeses that were performed alone. Posterior in situ
arthrodesis proved to be an effective, reliable, and safe treatment for
severe spondylolisthesis.