In the foot, there is an extra bone called the accessory navicular bone, also known as the os naviculare accessorium or os tibiale externum. This blog post discusses the causes, symptoms, diagnosis, treatment, and prevention of accessory navicular bone.
Causes
It is generally considered a congenital abnormality if an accessory navicular bone exists from birth, as it occurs as a result of incomplete bone fusion during fetal development. The exact cause of this condition is unclear, but genetic factors and developmental abnormalities are believed to be contributing factors.
Symptoms
There are some individuals with an accessory navicular bone who do not experience any symptoms, while others may experience symptoms such as:
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Physical activity or prolonged standing can cause pain and tenderness over the accessory navicular bone in the midfoot area.
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After physical activity, swelling and inflammation may occur around the accessory navicular bone.
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There may be redness or irritation of the skin overlying the accessory navicular bone.
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Walking difficulties: Some individuals may have difficulty walking or performing activities that require weight-bearing on the affected foot.
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An accessory navicular bone may contribute to flat feet (pes planus), a condition in which the foot loses its arch.
Diagnosis
The diagnosis of an accessory navicular bone involves a physical examination and imaging studies that may include X-rays or MRI scans to visualize the foot structure and confirm the existence of the extra bone. To determine the appropriate treatment course, the healthcare provider will also assess the individual's symptoms and medical history.
Treatment
Symptoms of an accessory navicular bone can be alleviated by the following treatments:
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Resting the affected foot and avoiding activities that aggravate symptoms can help reduce pain and inflammation. A brace or walking boot may be recommended to support the foot and promote healing.
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In order to treat pain and discomfort, over-the-counter pain medications such as ibuprofen or acetaminophen may be used.
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Individuals with flat feet may benefit from custom orthotic devices or shoe inserts that provide support and cushioning.
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Exercises in physical therapy can strengthen muscles and improve flexibility in the foot, reducing strain on the accessory navicular bone.
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Surgical removal of the accessory navicular bone, also known as accessory navicular excision, may be considered when conservative treatments fail to relieve symptoms.
Prevention
Accessories navicular bones are usually congenital anomalies and cannot be prevented. The condition can, however, be managed effectively by wearing supportive footwear and avoiding activities that exacerbate pain in order to alleviate symptoms and prevent complications.
