Thus, Grade I anterolisthesis is
Grade 1 anterolisthesis of L5 on S1.
that I have L5-S1 Spondylolisthesis, L5 Spondylolysis and grade 1 anterolisthesis with radicular pain.15 of posts and discussions on Pain Management for Anterolisthesis.
If you have Grade 4 anterolisthesis it means 100% slippage.
Degenerative spondylolisthesis usually occurs in older women, most often at L4/5, but can occur at other levels. This type of slip is due to degeneration of the pair of facet joints between the two affected vertebrae. It is virtually never worse than grade 1.