Clinical Study
Is Sacralization Really a Cause of Low Back Pain?
Table 1
Castellvi radiographic classification system of sacralization.
| Type IA | A unilateral TP height greater than or equal to 19 mm | Type IB | Both processes height 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 |
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TP: lowest lumbar transverse process.
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