40 Facts About Accessory Navicular Bone

What is an Accessory Navicular Bone?

An accessory navicular bone is an extra bone or piece of cartilage located on the inner side of the foot, just above the arch. This condition is congenital, meaning it is present at birth. Many people with this extra bone may not even realize they have it until it causes discomfort or pain.

1. The accessory navicular bone is also known as os naviculare accessorium or os tibiale externum.
2. It is found in approximately 2-12% of the general population.
3. This extra bone is usually located within the posterior tibial tendon, which helps support the arch of the foot.
4. The condition is more common in females than males.
5. It can be present in one foot or both feet.

Types of Accessory Navicular Bone

There are three main types of accessory navicular bones, each varying in size and shape. Understanding these types can help in diagnosing and treating the condition.

6. Type I is a small, round bone embedded within the posterior tibial tendon.
7. Type II is a larger, triangular-shaped bone connected to the navicular bone by cartilage.
8. Type III is a fused accessory navicular bone, forming an enlarged navicular bone.
9. Type II is the most common type, accounting for about 60% of cases.
10. Type III is the least common, making up around 30% of cases.

Symptoms of Accessory Navicular Syndrome

When the accessory navicular bone becomes symptomatic, it is referred to as accessory navicular syndrome. Symptoms can vary but often include pain and swelling.

11. Pain is usually felt on the inner side of the foot, just above the arch.
12. Swelling and redness may occur over the bony prominence.
13. Symptoms often worsen with physical activity, especially activities that involve running or jumping.
14. Wearing tight or ill-fitting shoes can exacerbate the pain.
15. Some people may experience a visible bony bump on the inner side of the foot.

Causes of Accessory Navicular Syndrome

Several factors can contribute to the development of accessory navicular syndrome. These factors can cause the extra bone to become irritated or inflamed.

16. Trauma or injury to the foot can trigger symptoms.
17. Overuse or repetitive stress on the foot can lead to inflammation.
18. Flat feet or fallen arches can increase the risk of developing symptoms.
19. Tight or poorly fitting shoes can put pressure on the accessory navicular bone.
20. Genetic factors may play a role, as the condition can run in families.

Diagnosing Accessory Navicular Syndrome

Diagnosing accessory navicular syndrome typically involves a combination of physical examination and imaging studies. Accurate diagnosis is essential for effective treatment.

21. A physical examination will assess the location of pain and swelling.
22. X-rays can reveal the presence and type of accessory navicular bone.
23. MRI or CT scans may be used to evaluate the soft tissues and bone structure in more detail.
24. The doctor may perform specific tests to rule out other foot conditions.
25. A thorough medical history will help identify any contributing factors.

Treatment Options for Accessory Navicular Syndrome

Treatment for accessory navicular syndrome aims to relieve pain and reduce inflammation. Both non-surgical and surgical options are available, depending on the severity of symptoms.

26. Rest and avoiding activities that aggravate symptoms can help reduce pain.
27. Ice packs applied to the affected area can decrease swelling and inflammation.
28. Over-the-counter pain relievers, such as ibuprofen, can provide relief.
29. Physical therapy may help strengthen the muscles and improve foot mechanics.
30. Custom orthotics or arch supports can alleviate pressure on the accessory navicular bone.

Surgical Treatment for Accessory Navicular Syndrome

In cases where non-surgical treatments are ineffective, surgery may be necessary. Surgical options aim to remove the accessory navicular bone or correct any associated deformities.

31. The Kidner procedure involves removing the accessory navicular bone and reshaping the posterior tibial tendon.
32. In some cases, the surgeon may fuse the accessory navicular bone to the navicular bone.
33. Recovery from surgery typically involves a period of immobilization in a cast or boot.
34. Physical therapy is often recommended after surgery to restore strength and flexibility.
35. Most patients experience significant pain relief and improved foot function after surgery.

Living with an Accessory Navicular Bone

Living with an accessory navicular bone can be manageable with the right strategies. Understanding how to care for your feet and prevent symptoms can improve your quality of life.

36. Wearing supportive shoes with a wide toe box can help reduce pressure on the accessory navicular bone.
37. Avoiding high-impact activities, such as running or jumping, can prevent symptom flare-ups.
38. Regular stretching and strengthening exercises can improve foot mechanics and reduce strain.
39. Maintaining a healthy weight can decrease stress on the feet and lower the risk of symptoms.
40. Monitoring your feet for any changes or new symptoms can help catch issues early and prevent complications.

Final Thoughts on Accessory Navicular Bone

Understanding the accessory navicular bone helps in recognizing foot pain causes. This extra bone, found in some people, can lead to discomfort and complications. Knowing its symptoms and treatment options is crucial. Treatments range from rest and ice to surgery in severe cases. Early diagnosis and proper care can prevent long-term issues.

Awareness of this condition empowers individuals to seek medical advice when experiencing unexplained foot pain. Don't ignore persistent discomfort; consult a healthcare professional. Proper footwear and supportive measures can also alleviate symptoms.

Remember, not everyone with an accessory navicular bone will experience problems. However, staying informed ensures you're prepared if issues arise. Knowledge is key to maintaining foot health and overall well-being. Stay proactive about your health, and take steps to address any concerns promptly.