Accessory navicular bone

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Accessory navicular bone
Os tibiale externum - Roe Fuss.jpg
X-ray of the foot showing an accessory navicular bone
Details
Identifiers
Latin os tibiale, os tibiale externum or naviculare secundarium
MeSH C536002
Anatomical terms of bone

An accessory navicular bone is an accessory bone of the foot that occasionally develops abnormally in front of the ankle towards the inside of the foot. This bone may be present in approximately 2-21% of the general population and is usually asymptomatic. [1] [2] [3] When it is symptomatic, surgery may be necessary.

Contents

Accessory navicular bone may cause a continuous stretch and stress on the tibialis posterior tendon which can progress to chronic disabling pain and may cause tendon rupture or secondary flat foot deformity; when this occurs this condition is commonly known as accessory navicular syndrome. [4]

Other conditions which closely mimic the symptoms of an accessory navicular bone include plantar fasciitis, bunions and heel spurs.

Classification

The Geist classification divides the accessory navicular bones into three types. [3]

Diagnosis

To diagnose accessory navicular syndrome, the foot and ankle surgeon will ask about symptoms and examine the foot, looking for skin irritation or swelling. The doctor may press on the bony prominence to assess the area for discomfort. Foot structure, muscle strength, joint motion and the way the patient walks may also be evaluated. X-rays are usually ordered to confirm the diagnosis. If there is ongoing pain or inflammation, an MRI or other advanced imaging tests may be used to further evaluate the condition. [5] [ citation needed ]

Treatment

Aside from surgery, there are a few options for handling an accessory navicular bone that has become symptomatic. This includes immobilization, icing, medicating, physical therapy, and orthotic devices. Immobilizing involves placing the foot and ankle in a cast or removable walking boot. This alleviates stressors on the foot and can decrease inflammation. Icing will help reduce swelling and inflammation. Medication involves usage of nonsteroidal anti-inflammatory drugs, or steroids (taken orally or injected) to decrease inflammation. Physical therapy can be prescribed in order to strengthen the muscles and help decrease inflammation. Physical therapy can also help prevent the symptoms from returning. Orthotic devices (arch support devices that fit in a shoe) can help prevent future symptoms. [6] Occasionally, the orthotic device will dig into the edge of the accessory navicular and cause discomfort. For this reason, the orthotic devices made for the patient should be carefully constructed. [7]

Radiological images

Related Research Articles

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References

  1. "Wheeless' Textbook of Orthopaedics". 2 June 2020.
  2. "Macrorad Teleradyoloji Olgu Sunumları - SYMPTOMATIC ACCESSORY NAVICULAR BONE".
  3. 1 2 Miller TT, Staron RB, Feldman F, Parisien M, Glucksman WJ, Gandolfo LH (June 1995). "The symptomatic accessory tarsal navicular bone: assessment with MR imaging". Radiology. 195 (3): 849–853. doi:10.1148/radiology.195.3.7754020. PMID   7754020.
  4. Sahibzada N. Mansoora; Farooq A.Rathore (October 2007). "Symptomatic accessory navicular bone: A case series". The Egyptian Rheumatologist. 39 (4): 263–266. doi: 10.1016/j.ejr.2017.02.003 .
  5. "Diagnosis". GARD. U.S. Department of Health & Human Services. Retrieved 20 January 2021.
  6. "Accessory Navicular Syndrome - Foot Health Facts".
  7. "Accessory Navicular Diagnosed & Treated by Foot Surgeons - Mercy in Baltimore".