后外侧或后路环形融合内固定治疗改善腰椎峡部裂性椎体滑脱患者下腰痛及功能活动障碍的效果

• Effect of posterolateral arthrodesis or posteriorly circumferential spinal fusion combined with posterior instrumentation in improving the low back pain and disorders of functional activity in patients with isthmic spondylolisthesis