Anteriorly angulated coccyx
18 female presenting for coccygeal pain.
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Lateral view of the pelvis demonstrates an acute/sharp anterior angulation deformity between the first and second coccygeal segments. This is consistent with a type III anteriorly angulated coccyx.
Anterior view of the pelvis demonstrates non-visualization of the coccyx, which is consistent with angular deformity on the AP projection.
Anterior angulation of the coccyx is considered a normal variant, which is unrelated to trauma. Postacchini and Massobrio described 4 types of anteriorly angulated coccyges (types I - IV).
The above case contains a good teaching point in that if the coccyx is non-visualized on an AP view of the pelvis, a lateral view can be obtained to discern the angulation of the coccyx.
This case was submitted with supervision and input from:
Soni C. Chawla, M.D.
Department of Radiological Sciences
David Geffen School of Medicine at UCLA
Olive View - UCLA Medical Center
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- Balain B, Eisenstein SM, Alo GO, et al. Coccygectomy for coccydynia: case series and review of literature. Spine (Phila Pa 1976) 2006; 31:E414.
- Postacchini F, Massobrio M. Idiopathic coccygodynia. Analysis of fifty-one operative cases and a radiographic study of the normal coccyx. J Bone Joint Surg Am. 1983 Oct;65(8):1116-24.