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Mnemonics, Simplified Concepts & Thoughts

Coccyx Types

Epomedicine, May 23, 2025May 23, 2025

Last updated on May 23, 2025

Postacchini and Massobrio Classification (Nathan Modification)

Can be classified into 6 types:

coccyx types
https://wikism.org/w/index.php?curid=4367

Type I (slight curve): Curved slightly forward with apex pointing caudally (>50% incidence)

Type II (forward curve): More prominent ventral curvature with coccyx apex pointing anteriorly (8-32% incidence)

Type III (sharp angle): Acute anterior angulation of coccyx but no subluxation (4-16% incidence)

Type IV (subluxation): Focal anterior angulation with anterior subluxation (1-9% incidence)

Type V (retroverted): Posteriorly angulated coccyx (1-11% incidence)

Type VI (scoliotic): Scoliotic deformity or lateral angulation of coccyx (1-6% incidence)

Clinical implication

Patients with a type II-IV coccyx are more prone to develop idiopathic coccygodynia

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Epomedicine. Coccyx Types [Internet]. Epomedicine; 2025 May 23 [cited 2025 Jun 16]. Available from: https://epomedicine.com/medical-students/coccyx-types/.

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