"type I: the coccyx is curved slightly forward, with its apex pointing caudally (~70%)"
"type II: the coccyx is curved more markedly anteriorly, with its apex pointing straight forward (~15%)"
"type III: the coccyx is sharply angulated forward between the first and second or the second and third coccygeal segments (~5%), or less commonly due to angulation at the S5 segment"
"type IV: the coccyx is subluxed anteriorly at the level of the sacrococcygeal joint or at the level of the first or second intercoccygeal joints (~10%)"
"type V: the coccyx is retroverted or has a posterior spicule"
"type VI: the coccyx is scoliotic (lateral deviation)"
Expected headings
"Classification"