What is a OS Naviculare?

The accessory navicular (os navicularum or os tibiale externum) is an extra bone or piece of cartilage located on the inner side of the foot just above the arch. It is incorporated within the posterior tibial tendon, which attaches in this area. An accessory navicular is congenital (present at birth).

Why is my navicular bone sticking out?

This can result from any of the following: Trauma, as in a foot or ankle sprain. Chronic irritation from shoes or other footwear rubbing against the extra bone. Excessive activity or overuse.

How common is accessory navicular bone?

An accessory navicular is an extra bone that is on the inner center arch of the foot. Up to 2.5 percent of individuals are born with the accessory navicular.

How is accessory navicular bone treated?

For people with accessory navicular bone who experience severe symptoms, surgery may be considered to remove the bony growth. Other treatments may include medications such as nonsteroidal anti-inflammatories (NSAIDs), immobilizing the area with a cast or boot, and physical therapy .

What is Type 2 OS Naviculare?

Type II is a secondary ossification center of the navicular bone and is also referred to as “prehallux”, accounting for approximately 50-60% of accessory navicular bones. It is seen over the medial pole of the navicular bone at between nine and 11 years of age (3).

Is accessory navicular surgery painful?

Surgery. If conservative measures fail and the fragment continues to be painful, surgery may be recommended. The most common procedure used to treat the symptomatic accessory navicular is the Kidner procedure. To perform this procedure, a small incision is made in the instep of the foot over the accessory navicular.

How long does it take for a navicular bone to heal?

It will take about 6 weeks for most people to heal. The goals of treatment are to manage pain and support the bone as it heals. This may include: Medicine to ease pain and swelling.

How do you relieve navicular pain?

Ice may be applied intermittently to alleviate inflammation. Over-the-counter nonsteroidal anti-inflammatories can help ease pain and inflammation. In more severe cases, injected or oral steroids may be required. Physical therapy may help strengthen the affected muscles and reduce the risk of the symptoms recurring.

How painful is accessory navicular syndrome?

Accessory navicular syndrome (ANS) can cause significant pain in the mid-foot and arch, especially with activity. Redness and swelling may develop over this bony prominence, as well as extreme sensitivity to pressure. Sometimes people may be unable to wear shoes because the area is too sensitive.

Is accessory navicular a disability?

A separate compensable disability rating for left foot painful accessory navicular bone, plantar fasciitis, or tendinitis is denied. An increased disability rating in excess of 20 percent for the service-connected painful accessory navicular bone over the left foot with plantar fasciitis is denied.

Why does my accessory navicular hurt?

The accessory navicular bone is easily felt in the medial arch because it forms a bony prominence there. Pain may occur if the accessory bone is overly large causing this bump on the instep to rub against footwear. This painful condition is called accessory navicular syndrome.

What is a Type 3 navicular?

Type III, also known as cornuate or gorilliform navicular, is characterized by a very prominent navicular tuberosity resulting from bony fusion of the accessory ossification center with the tuberosity. Most cases are asymptomatic, but ANB may cause pain and tenderness in a small proportion (<1%).

What are the symptoms of Type II OS naviculare?

Type II os naviculare forming pseudoarticulation with the navicular bone. Marrow edema signal in the opposing articular surfcaes. Mild tibialis posterior and flexor hallucis tenosynovitis.

Where is the accessory navicularum located in the foot?

The accessory navicular (os navicularum or os tibiale externum) is an extra bone or piece of cartilage located on the inner side of the foot just above the arch. It is incorporated within the posterior tibial tendon, which attaches in this area.

How big is the gap between the sesamoid and the navicular?

There is a small gap of approximately 3mm or less between the sesamoid and the navicular. Type II: consists of an accessory bone, up to 1.2cm in diameter, where synchondrosis develops between it and the navicular. Type III: is the fused accessory navicular resulting in a large cornuate shaped navicular.

How is the excision of the accessory navicular done?

There are 2 surgeries that can be performed depending upon the condition and symptoms A simple surgical excision to remove the accessory navicular along with its prominence. In this procedure, the incision is made dorsally to the prominence of the accessory navicular. Symptoms are relieved in 90% of cases.