Clinical Study
Retrospective Cohort Study of the Prevalence of Lumbosacral Transitional Vertebra in a Wide and Well-Represented Population
Table 1
Castellvi radiographic classification system of sacralization [
7].
| Type Ia | A unilateral TP height greater than or equal to 19 mm | Type Ib | Both processes heights greater than or equal to 19 mm | Type IIa | Presence of unilateral articulation between the TP and the sacrum | Type IIb | Presence of bilateral articulation between the TP and the sacrum | Type IIIa | Unilateral fusion of the TP and the sacrum | Type IIIb | Bilateral fusion of the TP and the sacrum | Type IV | Unilateral type II transition (articulation) with a type III (fusion) on the contralateral side |
|
|
TP: lowest lumbar transverse process.
|