Living with foot pain can significantly impact your daily activities, from walking around to participating in sports you love.
For the estimated up to 21% of the population born with an accessory navicular bone, this extra piece of anatomy can become a source of considerable discomfort and functional limitation.
At Superfeet, our goal is to get you back on your feet.
Whether you're experiencing your first symptoms or seeking better management strategies for chronic pain, we’ll cover everything you need to know about accessory navicular syndrome, from its underlying causes to effective treatment options that can help you reclaim an active, pain-free lifestyle.
Understanding Accessory Navicular Syndrome
Accessory Navicular Syndrome (ANS) occurs when an extra bone or cartilage piece, called an accessory navicular, becomes irritated and inflamed. This additional ossicle is located on the inner side of your foot, just above the arch, adjacent to the main navicular bone.
The navicular bone plays a critical role in supporting your foot's arch structure. While the accessory navicular bone is present from birth (congenital), it doesn't always cause problems.
The syndrome develops when this extra bone, or the posterior tibial tendon that often attaches to it, becomes aggravated through various triggers including overuse, trauma, or biomechanical stress.
Recognizing the Symptoms
The symptoms of ANS can range from mild discomfort to severe, activity-limiting pain. Key indicators include:
Primary Symptoms:
- Pain and swelling in the arch, particularly on the inner side of the foot
- Tenderness when touching the bony prominence above the arch
- Visible bump or elevated area on the inner midfoot
- Redness and warmth around the affected area during flare-ups
Functional Impact:
- Difficulty wearing certain types of shoes, especially those lacking proper arch support
- Pain that worsens during or after physical activity
- Altered walking pattern (limping) to compensate for discomfort
- Challenges with weight-bearing activities like running or prolonged standing
Accessory navicular syndrome commonly emerges during adolescence (ages 8-15) when bones are maturing, and cartilage transforms into more rigid bone structure. However, symptoms can develop at any age when triggered by specific factors.
Primary Causes of ANS Development
While the accessory navicular bone itself is inherited, several factors can trigger the development of painful symptoms:
Anatomical Factors:
- Bone maturation and calcification during growth periods
- Associated flat feet (pes planus) condition
- Genetic predisposition running in families
Activity-Related Triggers:
- Overuse and repetitive stress from sports (running, jumping, dancing)
- Prolonged standing or physically demanding occupations
- Sudden increase in activity levels without proper conditioning
External Factors:
- Acute trauma or injury to the foot
- Chronic irritation from ill-fitting footwear
- Lack of proper arch support in daily footwear
The connection between flat feet and accessory navicular syndrome is particularly significant, as the differing arch structure can place increased strain on the posterior tibial tendon, leading to inflammation and irritation of the accessory bone.
The Critical Role of Supportive Insoles
For individuals with accessory navicular syndrome, especially those with concurrent flat feet, the right insoles are fundamental to both immediate relief and long-term management.
Key Benefits of Quality Insoles
Arch Support: Premium insoles like Superfeet provide structural support to the medial longitudinal arch, preventing excessive pronation and reducing strain on the posterior tibial tendon and accessory navicular.
Pressure Distribution: Superfeet insoles help redistribute pressure evenly across the foot, directing stress away from the painful bony prominence and irritated tendon insertion site.
Stability and Foot Function: Superfeet insoles stabilize the foot within the shoe, promoting proper biomechanical function as you move that reduces abnormal forces contributing to inflammation.
Shock Absorption: Appropriate cushioning absorbs impact forces during daily activities, protecting irritated areas while enhancing overall comfort.
How Superfeet Insoles Make the Difference
At Superfeet, we have spent decades perfecting insole technology specifically designed to address the biomechanical issues underlying conditions like accessory navicular syndrome.
Our approach goes beyond basic cushioning to provide therapeutic support that makes a real difference.
Biomechanical Shape:
Unlike flat sockliners found in most shoes, Superfeet insoles feature a unique, contoured shape engineered to fit your foot's natural three-dimensional structure.
This precision fit fills the gap between your foot and the flat sole of your footwear, providing unmatched arch support and comfort that can address the stability needs crucial for ANS management.
Written in consultation with and reviewed by Superfeet Biomechanics and Education experts, including Justin Wager, PhD