Spondylolisthesis refers to the displacement of vertebral body, in relation to its inferior vertebra.
- Retrolisthesis: Posterior displacement of vertebral body relative to the one below.
- Anterolisthesis: Anterior displacement of vertebral body relative to the one below.
Grading
- grade I: < 25% displacement of the vertebral body.
- grade II: 25-50% displacement of the vertebral body.
- grade III: 50-75% displacement of the vertebral body.
- grade IV: 75-100% displacement of the vertebral body.
- grade V: spondyloptosis
Case courtesy of Dr Jose R Zuniga.