An accessory navicular is defined as an extra bone in the foot, and oftentimes it causes moderate to severe discomfort. Depending on the severity, your doctor may recommend a non-surgical treatment to alleviate the pain, or surgery if treatment doesn?t decrease symptoms.
Just having an accessory navicular bone is not necessarily a bad thing. Not all people with these accessory bones have symptoms. Symptoms arise when the accessory navicular is overly large or when an injury disrupts the fibrous tissue between the navicular and the accessory navicular. A very large accessory navicular can cause a bump on the instep that rubs on your shoe causing pain.
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.
It is important to examine the posterior tibial tendon and measure the extent of pain to this tendon proximal to the navicular bone. You can clinically determine the amount of posterior tibial tendon involvement by assessing the degree of swelling, pain on palpation and strength. To evaluate the patient?s strength, have the patient stand and balance on one foot along with rising up on his or her toes.
Non Surgical Treatment
Treating accessory navicular syndrome is focused on relieving symptoms. Some treatment methods are Icing to reduce swelling. Immobilization with a cast or walking boot to reduce inflammation and promote healing. Medications to reduce pain and inflammation. Physical therapy to strengthen muscles. Orthotics to support the arch. Surgery may be needed to remove the accessory bone and reshape the area if other methods are not successful.
Fusion of the accessory navicular to the navicular with screws is required when there is a large accessory navicular bone and removal of this bone would reduce the articular surface of the Navicular to the talus (coxa pedis). Fusion will relieve pain without disrupting the tibialis posterior tendon insertion nor narrowing talar head support. In most instances, a patient’s recovery will be as follows. 0-6 weeks: Immobilization (in case or cast boot) non-weight-bearing or touch weight-bearing. 6-10 weeks: Increasing activity in a cast boot. Physical therapy to work on strength and balance. Full recovery after 9 weeks-2 months. In some patients (where the posterior tibial tendon Why is my Achilles tendon burning? still intact and functioning) the treating surgeon may allow weight-bearing as tolerated in a cast boot immediately after surgery.
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