Spondylolisthesis Dyplastic Isthmic
Definition
Forward slip of one vertebra relative to inferior one
Classification
Wiltse "DID TIP"
Dysplastic
Isthmic
Degenerate
Traumatic
Iatrogenic
Pathological
1. Dysplastic 20 %
Congenital Dysplasia of Upper Sacrum
- occurs at L5-S1