What is sacralization and lumbarization?
- Sacralization is when the fifth lumbar vertebra takes the form of the first sacral vertebra. In complete sacralization (in adults), there is one sacrum and four lumbar vertebrae.
- Lumbarization is when the first sacral vertebra takes the form of the sixth lumbar vertebra. Complete lumbarization results (in adults) in the presence of one sacral vertebra and six lumbar vertebrae.