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Radiographic Postacchini and Massobrio Classification of the coccyx
| Radiographic Postacchini and Massobrio Classification of the coccyx | Total number (n=22) | Improvement on conservative treatment | Needs coccygectomy |
|---|---|---|---|
| Type I: Curved slightly forward | 10 | 10 | 0 |
| Type II: More marked curve, straight forward | 7 | 4 | 3 |
| Type III: Sharply angled anteriorly | 3 | 0 | 3 |
| Type IV: Subluxation of the sacrococcygeal or intercoccygeal joints | 2 | 0 | 2 |
