Blog > Understanding and Treating Os Trigonum Syndrome

Understanding and Treating Os Trigonum Syndrome

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What is Os Trigonum Syndrome?

An os trigonum is an extra bone located behind the talus (ankle bone) that can develop at birth. Only a small number of people have this extra bone.

Os trigonum syndrome is the inflammation of the area in the back of the ankle, typically triggered by an injury, such as a fall or an ankle sprain. Os trigonum syndrome can also be caused by the repetitive downward pointing of the toes, which is common among dancers, soccer players, and other athletes.

Identifying Os Trigonum Syndrome Pain

Patients with os trigonum syndrome typically complain of pain in the back of the ankle, occurring mostly when pointing toes downwards or walking. They will also often have tenderness and/or swelling in the back of the ankle.

Diagnosing Os Trigonum Syndrome

Diagnosis begins with questions from the doctor about the development of symptoms. After the foot and ankle are examined, x-rays and other imaging tests, such as an MRI, are often ordered to assist in making the diagnosis. Os trigonum syndrome can mimic other conditions, such as an Achilles tendon injury, ankle sprain, or talus fracture.

Surgical Treatments

Surgery is only performed if symptoms do not resolve with conservative treatment. Surgery involves removing the os trigonum, as this extra bone is unnecessary for normal foot/ankle function.

Non-Surgical Treatments

Nonsurgical treatment of os trigonum syndrome is usually attempted first. It is important to stay off the injured foot to let the inflammation subside. A walking boot is often used to restrict ankle motion and to allow the injured tissue to heal.

Medicating To Reduce Pain

Nonsteroidal anti-inflammatory drugs (NSAIDs), such as ibuprofen, may help reduce pain and inflammation. Placing an ice pack on the affected area may also help reduce swelling. In patients who do not improve with these methods, treatment may include cortisone injections, local anesthetics, or other agents.

When To See The Pediatric Orthopedic Center

If you feel your child is experiencing symptoms or signs related to this condition, it may be time to visit us. The Pediatric Orthopedic Center is the premier NJ hub for pediatric orthopedics, with three offices throughout northern NJ. Having been the leader in pediatric orthopedics in this area for 30 years, we are the largest and most award-winning pediatric orthopedic practice in the tri-state area.

Schedule an Appointment with a Specialist Today

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Know Before Your First Visit

Verify the date and time of your appointment. You may be required to complete new patient paperwork or provide personal information prior to being seen by your doctor. Please arrive approximately 30 minutes prior to your appointment time.

Confirm the address and location of your appointment. The Pediatric Orthopedic Center has four convenient locations in New Jersey. Confirm with the front desk staff the office location for your visit.

Be aware of travel issues and delays. Be mindful of any driving conditions, road construction detours and parking requirements to ensure you arrive for your appointment on time.

Urgent Care for Acute Injuries (Cedar Knolls)

Walk-In Hours Update

*Urgent and Acute Injuries Only during Urgent Care/Walk-in Clinic hours. To find out if your child’s injury qualifies for a walk-in visit, click here. (Walk-in fees may apply.)


Regular Hours: 9am-5pm
Walk-in Hours* (Cedar Knolls): 5pm-8pm


Regular Hours: 9am-5pm
Walk-in Hours* (Cedar Knolls): 5pm-8pm


Regular Hours: 9am-5pm
Walk-in Hours* (Cedar Knolls): 5pm-8pm


Regular Hours: 9am-5pm
Walk-in Hours* (Cedar Knolls): 5pm-8pm


Regular Hours: 8am-5pm
NO walk-in hours.


Walk-in Hours* (Cedar Knolls): 10am-2pm

Sunday: Closed

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