Spontaneous reduction of spondylolisthesis during growth: a case report.

Isthmic spondylolisthesis is a common cause of low back pain in children. It is associated with a defect in the pars interarticularis of the vertebra. The treatment depends on the clinical course and degree of spondylolisthesis. Low-grade isthmic spondylolisthesis usually shows a benign course without significant progression and therefore, conservative treatment is advised. Although isthmic pars defect can heal, initial existing degree of slippage persists. A complete reversion of deformity was never described yet. We present the case of a 7½-year-old girl with symptomatic grade 2 isthmic spondylolisthesis according to the Meyerding classification. Without any specific therapy, there was a radiologically documented near total reversion of slippage and total relief of clinical symptoms during 8 years of follow-up. Computed tomography scan after this period showed persisting pars interarticularis defect without signs of healing. This case report indicates that during growth, spontaneous reversion of vertebral slip in isthmic spondylolisthesis can occur, even without healing of the pars defect.