Definition

A coccyx fracture is a broken tailbone. The coccyx is the lowest part of the backbone or spine. It is small and shaped like a triangle. The bone curves gently from the end of the spine into the pelvis.

The Coccyx

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Causes

Causes of coccyx fracture include:

• Falling on the buttocks—Skating and other activities that lead to falls in a seated position
• During birth—Newborns can break their coccyx going through the birth canal

Risk Factors

Risk factors that increase your chance of a coccyx fracture include:

• Sex: female—A woman's broader pelvis leaves the coccyx more exposed to injury
• Increased age
• Reduced muscle mass, which may lead to poor balance and increased risk of falls
• Osteoporosis
• Poor nutrition, especially low in calcium and vitamin D
• Certain congenital bone conditions
• Participating in certain activities, such as skating
• Violence

Symptoms

Symptoms may include:

• Pain that increases with sitting or getting up from a chair
• Pain that increases during a bowel movement
• Tenderness over the tailbone

Diagnosis

The doctor will ask about your symptoms and how the injury occurred. A physical exam will be done. The exam may include a rectal exam. During a rectal exam, the doctor places a lubricated, gloved finger into the rectum and feels for any abnormalities. If the coccyx is fractured, your doctor may feel abnormal movement of the coccyx. You will experience pain. X-rays may or may not be needed.

Treatment

The goal is to manage pain until the bone can heal. Strong muscles in the area can pull the coccyx back out of position. The location of the coccyx and the number of muscles attached to it makes it difficult to prevent it from moving while it is healing.

The area may remain painful for a long period of time, even after the fracture has healed. You may be advised to stay in bed for a day or two, or move only as comfort allows. Steroid injections or surgery may be considered if severe pain persists. Surgery for a painful coccyx fracture is rare and not very successful. Usually, pain slowly disappears.

If you are diagnosed with a coccyx fracture, follow your doctor's instructions.

Prevention

To help prevent a coccyx fracture:

• Eat a diet rich in calcium and vitamin D.
• Do weight-bearing exercises to build strong bones.
• Build strong muscles to prevent falls.