Abstract
Introduction: High-dysplastic developmental spondylolisthesis (HDDs) is extremely rare, comprising 5% of the total cases of spondylolisthesis. It can remain asymptomatic for a long time and can progress to a more severe grade of olisthesis and spondyloptosis. Opinions regarding the surgical management of highgrade dysplastic spondylolisthesis in children and adolescents still remain conflicting and controversial. case report: this case describes a 12-year-old girl with high-grade dysplastic L5-s1 spondylolisthesis with instability pain, managed with uninstrumented in situ circumferential fusion. the patient showed excellent clinical, functional and radiological outcomes at follow-up of 48th month. since, plain radiographs and conventional computed tomography (ct) scan failed to show convincing anterior intercorporal fusion, we did fusion analysis with a multi-slice helical tomography scan with multiplanar reconstruction. the reconstructed multiplanar images defined a good posterolateral and anterior intercorporal
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