Coccyx fracture
Fracture of the coccyx, often from falls or childbirth.
A coccyx fracture, also known as a broken tailbone or puzzle fracture, involves a break in the coccyx. This small bone sits at the very bottom of the spine, just below the sacrum, and represents the final segment of the vertebral column found in apes. In humans, it typically consists of three to five vertebrae that are fused together (though they can occasionally remain separate), measuring between 4 and 10 cm in length. The coccyx connects to the sacrum through a fibrocartilaginous joint called the sacrococcygeal symphysis, which permits only slight movement.
The most common causes of a coccyx fracture are falls directly onto the buttocks or the stress of childbirth. Several factors increase the risk, including low muscle mass, advanced age, osteoporosis, being female (due to the typically wider pelvis), and experiencing violence.
Symptoms include pain that worsens when sitting down, standing up from a chair, or during a bowel movement. There is often tenderness directly over the tailbone, along with possible nausea, bruising, or swelling in that area.
Diagnosis relies on a patient’s medical history and a physical exam that includes a rectal examination. X-rays, particularly dynamic (sitting and standing) views, are commonly used to help confirm the diagnosis and assess fracture displacement, though their role is sometimes debated in specific clinical contexts.
For most cases, treatment involves self-care at home rather than hospitalization, which is rarely needed. Patients are advised to sit on soft surfaces to reduce pressure on the coccyx. A donut or wedge cushion—essentially a cushion with a hole—can keep weight off the injured area. Pain relievers like ibuprofen are recommended, along with a high-fiber diet to soften stools and prevent constipation. Doctors typically do not attempt to realign a badly positioned fracture, as the surrounding muscles are strong enough to pull the bone back into place on their own. The bone is also difficult to immobilize due to the many muscles attached to it and its location.
Surgery is usually unnecessary. However, if pain persists after the fracture has healed and is severe enough to cause significant disability, a coccygectomy—surgical removal of the coccyx—may be considered.
See also: Sacral fracture (rarer).
- type
- Medical condition
- common_name
- Broken tailbone
- location
- Base of spine, under sacrum
- typical_length
- 4 to 10 cm
- typical_vertebrae_count
- 3 to 5 fused or separate
- common_causes
- Falls into seated position, childbirth
Lore & Background
Causes of coccyx fracture can vary greatly, but are most commonly confined to falls into the seated position, or childbirth. Risk factors include lack of or reduced muscle mass, advanced age, osteoporosis, being of the female sex (due to the wider pelvis typically found in females), and violence. Symptoms include pain that increases in severity when sitting or getting up from a chair, or when experiencing bowel movement; provoked pain over the tailbone; nausea; and bruising or swelling in the tailbone area.
Reader's Guide
The standard workup of a suspected coccyx fracture includes medical history and a physical examination including a rectal examination. X-ray has no quantifiable clinical impact, and is regarded as a waste of resources and unnecessary exposure to ionizing radiation. Treatment typically involves self-care at home: sitting on soft surfaces, using a 'donut' or 'wedge' cushion, taking painkillers such as ibuprofen, and following a high-fiber diet to soften stools. Doctors will not usually attempt to correct a bad alignment, as muscles in the area are powerful and can pull the bone back into the 'original' position; the bone is also very difficult to immobilise due to the number of muscles attached and its position. Surgery is not usually required, but if pain continues after healing and causes serious disability, surgical removal of the coccyx (coccygectomy) may be performed. Short-term hospitalisation is extremely rare.
Did You Know?
- The coccyx is the last section of the ape vertebral column.
- Dynamic X-rays (taken while sitting and standing) are commonly used to diagnose coccyx fractures and assess instability, though their routine use is sometimes debated.
- A 'donut' or 'wedge' cushion is simply a cushion with a hole to avoid weight on the injured tailbone.
- Surgical removal of the coccyx (coccygectomy) may be required if pain continues despite conservative treatment.
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