The coccyx, or tailbone, consists of three to five fused rudimentary vertebrae at the base of the sacrum, providing attachment for muscles of the pelvic floor and gluteus maximus and serving as a weight-bearing surface during sitting.
The coccyx is the vestigial tail consisting of 3 to 5 fused coccygeal vertebrae. Coccydynia (tailbone pain) from a fall or childbirth injury is a common and often underappreciated source of significant disability. The anococcygeal ligament attaches here and the levator ani and coccygeus muscles form the pelvic floor around it. Coccygeal fractures are managed conservatively with padded seating and coccygeal steroid injections, with coccygectomy reserved for truly refractory cases.
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