Exercises To Help Accessory Navicular Syndrome

Overview
The bones of the foot occasionally develop abnormally in a child and an extra bone called an accessory navicular is present towards the inside of the foot, in front of the ankle. This bone is present in approximately 10% of the general population but not large enough to cause symptoms in the majority of these individuals. The extra bone lump present in childhood can be quite uncomfortable because it rubs on shoes. In addition, the feet associated with the accessory navicular are invariably flat. If the child is active and involved in various athletic activities, this will aggravate the inflammation of the tendon that attaches to the accessory navicular. This tendon is called the posterior tibial tendon and is responsible for maintaining the strength of the arch of the foot. The flat-footedness associated with the accessory navicular usually brings the child for treatment.



Causes
An accessory navicular develops as a result of a congenital anomaly and is found more often in women. If the bone is large, it may rub against a shoe, causing pain. Because of its location, the posterior tibial tendon may pull on the bone during walking or running, causing the fibrous tissue that connects the accessory navicular to the navicular to tear and become inflamed.

Symptoms
What are the signs/symptoms of Accessory Navicular Syndrome? Pain in the foot following trauma (such as after an ankle sprain) Chronic irritation from shoes or other footwear rubbing against the bone. A visible bony prominence on the inner side of the foot just above the arch. Redness and swelling of that area. Vague pain or throbbing in the arch mostly occuring during or after periods of physical activity. Symptoms appear most often during adolescence, but some may not occur until adulthood.

Diagnosis
To diagnose accessory navicular syndrome, medical staff ask about the patient?s activities and symptoms. They will examine the foot for irritation or swelling. Medical staff evaluate the bone structure, muscle, joint motion, and the patient?s gait. X-rays can usually confirm the diagnosis. MRI or other imaging tests may be used to determine any irritation or damage to soft-tissue structures such as tendons or ligaments. Because navicular accessory bone irritation can lead to bunions, heel spurs and plantar fasciitis, it?s important to seek treatment.

Non Surgical Treatment
Treatment options for a painful accessory navicular can include anti-inflammatory medications, rest, arch support structures in the shoe, or use of a cast or splint. Severe cases may require surgery.



Surgical Treatment
If non-surgical treatment fails to relieve the symptoms of accessory navicular syndrome, surgery may be appropriate. Surgery may involve removing the accessory bone, reshaping the area, and repairing the posterior tibial tendon to improve its function. This extra bone is not needed for normal foot function.