How Orthotic Care Can Help Adult-Acquired Flatfoot?

Adult-acquired flatfoot (AAF) is a complex condition that affects many people, often causing significant discomfort and disability. It can be challenging to treat effectively, and understanding its different stages is crucial for providing the right care. This blog will simplify the condition, explain its progression, and offer practical advice on managing it with appropriate orthotic therapy.

What is Adult-Acquired Flatfoot?

Adult-acquired flatfoot is a condition where the arch of the foot collapses over time. This can lead to pain, deformity, and difficulty walking. Unlike flatfoot, which is present from childhood, AAF develops in adults, often due to the weakening of the tibialis posterior tendon. This tendon helps support the arch, and the foot can flatten out when it weakens or becomes damaged.

Why is AAF Difficult to Treat?

Treating AAF is complicated due to the various factors involved. The condition affects not just the tendon but also the ligaments and bones of the foot. The severity of AAF can vary widely, making it essential to identify the stage of the condition to determine the most effective treatment.

Stages of Adult-Acquired Flatfoot and How Can Adult Orthotic Care Help?

Stage I: Early Tendinitis

In Stage I, the primary issue is tendinitis of the tibialis posterior tendon. This stage is characterized by pain and swelling along the tendon. The foot’s arch might start to flatten, but the foot remains flexible. People in this stage can still perform a heel raise, though it might be uncomfortable.

Treatment for Stage I:

• Rest and Immobilization: A rigid walking boot with a high midsole rocker can help rest the tendon and reduce inflammation. The rocker allows for natural foot movement while resting the tendon.
• Orthotics: Custom foot orthoses, like those made from rigid polypropylene, help maintain the arch and provide support. These devices should have a deep heel cup and a medial heel skive to correct alignment and improve comfort.

Stage II: Tendinosis and Ligament Damage

Stage II involves more significant changes. The tendinitis progresses to tendinosis, where the tendon becomes damaged. The foot arch lowers further, and the forefoot may turn outward. The ability to perform a heel raise is diminished, and the foot shows signs of deformation.

Treatment for Stage II:

• More Supportive Orthotics: At this stage, more advanced orthotics, like the Richie Brace, are needed. These braces support the foot, stabilize the lower leg, and control movement above the ankle.
• Footwear: To manage symptoms and support the foot structure, it is essential to choose rigid athletic shoes with motion control or stiff shank construction.

Stage III: Rigid Deformity

In Stage III, the foot becomes rigid, and the rear foot cannot be easily repositioned. There is significant arthritis in the joints, and pain persists. Standard orthotics may not be effective, and the goal shifts to symptom relief and preventing further deformity.

Treatment for Stage III:

• Gauntlet Braces: These braces provide comprehensive support by restricting movement in all three planes—sagittal, frontal, and transverse—without sacrificing mobility. They are custom-made from a semi-weight-bearing cast and are designed to accommodate the foot’s current state, including any equinus deformity.
• Rockers in Footwear: Adding a rocker sole to shoes can help compensate for the lack of ankle movement and reduce strain on the foot.

How to Approach Orthotic Therapy

Orthotic therapy is tailored to each stage of AAF. Here are some guidelines:

Stage I: Use a negative cast to create a custom orthosis. The device should have a deep heel cup, medial flange, and a high midsole rocker.

Stage II: A podiatric AFO with leg uprights helps stabilize the rearfoot and control motion. Use a negative cast to ensure proper fit and functionality.

Stage III: A gauntlet brace with a deep foam cast and a high brace height provides the necessary support. Adjustments may be required for patients with ankle joint degeneration.

Conclusion

Managing adult-acquired flatfoot effectively requires a clear understanding of its progression and the right treatment for each stage. From early tendinitis to severe deformity, each stage presents unique challenges and requires specific interventions. Orthotic therapy supports the foot and slows the condition’s progression.

If you’re experiencing symptoms of AAF, consult a healthcare professional to determine the appropriate stage and treatment plan. Proper staging and targeted therapy can help restore mobility, reduce pain, and improve quality of life.