Ankle Replacement and Ankle Arthrodesis in the Treatment of Osteoarthritis

Osteoarthritis (OA) is a condition that affects joints and their cartilage, causing structural and functional deterioration. While it commonly affects joints like the knee and hip, ankle osteoarthritis is less discussed due to its lower occurrence. Two main treatments for ankle OA are total ankle replacement (TAR) and ankle arthrodesis (AAD).

How Common It Is and Who Gets It? (Epidemiology)

Ankle osteoarthritis is less common compared to OA in other joints, such as the knee or hip, but it still significantly impacts a portion of the population, especially older adults and those with a history of trauma, fractures, or other joint deformities. Ankle OA is also more common in individuals with conditions like rheumatoid arthritis, previous ankle surgeries, or those with chronic instability. While TAR is a growing treatment option, AAD remains widely used due to its long history of effectiveness.

Why It Happens – Causes (Etiology and Pathophysiology)

Ankle OA develops when the cartilage within the ankle joint deteriorates, leading to pain, stiffness, and loss of motion. This can occur due to:

  • Trauma or Injury: Previous fractures or sprains can lead to long-term damage to the joint.
  • Degeneration: The natural aging process leads to wear and tear on the cartilage.
  • Inflammatory conditions: Conditions like rheumatoid arthritis can also contribute to cartilage breakdown in the ankle joint.

How the Body Part Normally Works? (Relevant Anatomy)

The ankle joint is where the tibia and fibula meet the talus bone. Healthy cartilage covers these bones, allowing smooth movement when walking, running, or jumping. In OA, the cartilage deteriorates, causing bone-on-bone contact and pain. In both TAR and AAD, the goal is to address this degeneration and restore function: TAR replaces the joint with an artificial implant, while AAD fuses the bones to prevent movement and alleviate pain.

What You Might Feel – Symptoms (Clinical Presentation)

Ankle OA can cause:

  • Persistent pain, especially with weight-bearing activities
  • Stiffness in the ankle joint
  • Swelling and tenderness around the joint
  • A reduced range of motion, particularly in dorsiflexion and plantarflexion
  • Difficulty walking, running, or standing for extended periods

How Doctors Find the Problem? (Diagnosis and Imaging)

Ankle OA is typically diagnosed through:

  • Physical Examination: To assess the range of motion, pain levels, and joint stability.
  • X-rays: To check for joint space narrowing, bone spurs, or other signs of OA.
  • MRI: To assess soft tissue damage, such as cartilage wear, ligament injuries, or bone bruises.

Classification

Treatment options for ankle OA are generally based on the severity of the condition:

  • Mild OA: Often treated with conservative measures like bracing, physical therapy, or corticosteroid injections.
  • Moderate to Severe OA: Surgical options like TAR or AAD are considered for patients who do not respond to non-surgical treatments.

Other Problems That Can Feel Similar (Differential Diagnosis)

Conditions that may mimic ankle OA include:

  • Achilles Tendonitis: Inflammation in the Achilles tendon that can cause ankle pain.
  • Plantar Fasciitis: Pain in the bottom of the foot that may be confused with OA.
  • Tarsal Tunnel Syndrome: Nerve compression in the ankle leading to pain and discomfort.

Treatment Options

Non-Surgical Care

  • Physical therapy: Exercises to improve strength, flexibility, and range of motion.
  • Bracing and orthotics: To support the ankle and reduce pain during movement.
  • Medications: NSAIDs to reduce pain and inflammation.
  • Corticosteroid injections: To reduce inflammation and manage pain.

Surgical Care

  • Total Ankle Replacement (TAR): Involves replacing the damaged ankle joint with an artificial implant to restore motion and reduce pain.
  • Ankle Arthrodesis (AAD): Fusing the bones of the ankle joint to provide pain relief and joint stability.

Recovery and What to Expect After Surgery (Recovery Process)

Post-surgery, recovery will vary depending on the procedure:

  • TAR: Patients will typically wear a protective boot or cast and gradually begin partial weight-bearing. Physical therapy will be required to restore motion, strength, and function. Full recovery may take 6 months to a year.
  • AAD: Recovery also includes wearing a boot and gradually increasing weight-bearing, but it generally takes longer than TAR. Complete recovery may take up to 12 months, as fusion requires the bones to heal together.

Possible Risks or Side Effects (Complications)

Risks associated with both TAR and AAD include:

  • Infection: A risk with any surgery.
  • Implant failure (TAR): The artificial joint may loosen, fracture, or shift.
  • Nonunion (AAD): The ankle bones may fail to fuse properly.
  • Adjunct joint arthritis: In cases of AAD, adjacent joints may develop arthritis due to altered biomechanics.
  • Wound healing issues: Incisions may become infected or fail to heal properly.

Prognosis (Long-Term Outlook)

The prognosis for both TAR and AAD is generally good, with most patients experiencing pain relief and improved function. However, TAR is considered a more flexible option, offering a more natural range of motion. AAD, while effective in alleviating pain, restricts ankle motion, potentially leading to stress on adjacent joints.

Out-of-Pocket Costs

Medicare

CPT Code 27702 – Total Ankle Replacement (TAR): $226.36

CPT Code 27870 – Ankle Arthrodesis (Fusion): $236.43

Medicare Part B covers 80% of the approved cost for these procedures once your annual deductible has been met, leaving you responsible for the remaining 20%. Supplemental Insurance plans such as Medigap, AARP, or Blue Cross Blue Shield typically cover this remaining 20%, ensuring minimal or no out-of-pocket expenses for Medicare-approved surgeries. These plans are structured to coordinate with Medicare, reducing the patient’s financial responsibility.

If you have Secondary Insurance such as TRICARE, an Employer-Based Plan, or Veterans Health Administration coverage, it will act as a secondary payer after Medicare. These plans usually cover any remaining balance, including coinsurance or small deductibles, which typically range from $100 to $300 depending on your plan and provider network.

Workers’ Compensation

If your Total Ankle Replacement (TAR) or ankle fusion is required due to a work-related injury, Workers’ Compensation will cover all associated medical expenses, including surgery, rehabilitation, and follow-up care. You will have no out-of-pocket expenses, as the employer’s insurance carrier directly covers all approved treatments.

No-Fault Insurance

If your ankle injury or need for fusion or replacement surgery resulted from an automobile accident, No-Fault Insurance will typically cover the entire cost of treatment, including surgery and postoperative care. The only potential out-of-pocket cost may be a small deductible or co-payment based on your policy terms.

Example

John Smith underwent Total Ankle Replacement (CPT 27702) due to severe arthritis in his ankle, with an estimated Medicare out-of-pocket cost of $226.36. Later, he needed an ankle arthrodesis (CPT 27870) due to failure of the TAR. Since John had supplemental insurance through Blue Cross Blue Shield, his remaining balance was fully covered, leaving him with no out-of-pocket expenses for either procedure.

Frequently Asked Questions (FAQ)

What is Total Ankle Replacement (TAR)?
Total Ankle Replacement is a surgical procedure where the damaged ankle joint is replaced with an artificial implant to restore motion and reduce pain from arthritis or injury.

What is Ankle Arthrodesis (AAD)?
Ankle Arthrodesis (AAD) is a procedure where the ankle joint is surgically fused to relieve pain and improve stability in cases of severe arthritis or deformity.

What are the main differences between TAR and AAD?
TAR preserves ankle motion by replacing the joint with an artificial implant, while AAD fuses the bones together, providing pain relief but limiting joint movement.

How do I prepare for TAR or AAD surgery?
Preparation includes a physical exam, imaging studies, discussing medical history, avoiding smoking, and maintaining a healthy weight to reduce stress on the ankle during recovery.

What is the recovery time for TAR and AAD?
Recovery time varies: TAR typically requires 6 months to a year for full recovery, while AAD may take up to 12 months due to the bone fusion process.

What are the risks of TAR and AAD?
Risks include infection, implant failure (TAR), nonunion (AAD), and adjacent joint arthritis.

How effective is TAR and AAD for ankle arthritis?
Both procedures are effective, with TAR offering better motion and function in the short term. AAD provides long-term pain relief but limits ankle mobility.

Is physical therapy required after TAR or AAD surgery?
Yes, physical therapy is essential to restore strength, range of motion, and balance after surgery.

Summary and Takeaway

Total ankle replacement and ankle arthrodesis are both effective surgical options for severe ankle arthritis. TAR offers the benefit of preserved ankle motion, while AAD provides stability but restricts movement. The choice of surgery depends on the patient’s specific needs, goals, and health condition.

Clinical Insight & Recent Findings

A recent large German study compared long-term outcomes of ankle fusion (arthrodesis) and total ankle replacement (TAR) in patients with severe ankle osteoarthritis. The analysis found that reoperation rates were initially higher with TAR but improved significantly over time as surgical techniques and implant designs advanced. 

By the later years studied, both TAR and fusion showed similar rates of unplanned reoperations, suggesting TAR has become a safe and effective alternative to fusion for many patients. Risk factors such as osteoporosis, diabetes, and younger age increased the likelihood of additional surgery, underscoring the need for individualized treatment planning. 

Overall, the study supports the growing role of ankle replacement alongside fusion in treating advanced ankle arthritis. (“Study comparing ankle fusion and replacement – see PubMed”)

Who Performs This Surgery? (Specialists and Team Involved)

Total ankle replacement and ankle arthrodesis are typically performed by orthopedic surgeons specializing in foot and ankle surgery. The surgical team includes anesthesiologists, nurses, and physical therapists to assist in preoperative, intraoperative, and postoperative care.

When to See a Specialist?

You should see a foot and ankle specialist if you experience significant pain, swelling, or limited mobility due to arthritis in the ankle joint. If conservative treatments have not provided relief, surgery may be considered.

When to Go to the Emergency Room?

Seek emergency care if you experience sudden severe pain, swelling, or instability in the ankle after surgery. This could indicate a complication such as infection or implant failure.

What Recovery Really Looks Like?

Recovery varies, but most patients can return to light activities within 6 months. Full recovery, including return to high-impact activities, typically occurs within 12 months.

What Happens If You Delay Surgery?

Delaying surgery can lead to worsening arthritis, increased pain, and limited mobility. Early intervention helps improve outcomes and reduce the risk of complications.

How to Prevent Recurrence or Failure?

To prevent complications, follow all post-surgical instructions, wear the recommended footwear, and engage in physical therapy to support healing and mobility.

Nutrition and Bone or Joint Health

A diet rich in protein, calcium, vitamin D, and omega-3 fatty acids supports bone and joint healing after surgery. Maintaining overall health is key to a successful recovery.

Activity and Lifestyle Modifications

Engage in low-impact activities such as swimming or cycling during recovery. Avoid high-impact activities until cleared by your surgeon. Regular stretching and strengthening exercises will help maintain joint health.

Do you have more questions?

Call Us

(631) 981-2663

Fax: (212) 203-9223

foot-and-ankle Treatments

Dr Mo Athar md

A seasoned orthopedic surgeon and foot and ankle specialist, Dr. Mohammad Athar welcomes patients at the offices of Complete Orthopedics in Queens / Long Island. Fellowship trained in both hip and knee reconstruction, Dr. Athar has extensive expertise in both total hip replacements and total knee replacements for arthritis of the hip and knee, respectively. As an orthopedic surgeon, he also performs surgery to treat meniscal tears, cartilage injuries, and fractures. He is certified for robotics assisted hip and knee replacements, and well versed in cutting-edge cartilage replacement techniques.

 

In addition, Dr. Athar is a fellowship-trained foot and ankle specialist, which has allowed him to accrue a vast experience in foot and ankle surgery, including ankle replacement, new cartilage replacement techniques, and minimally invasive foot surgery. In this role, he performs surgery to treat ankle arthritis, foot deformity, bunions, diabetic foot complications, toe deformity, and fractures of the lower extremities. Dr. Athar is adept at non-surgical treatment of musculoskeletal conditions in the upper and lower extremities such as braces, medication, orthotics, or injections to treat the above-mentioned conditions.
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