Ankle Fusion vs Ankle Replacement

Ankle Fusion (Arthrodesis)

Ankle fusion permanently joins the tibia and talus bones, eliminating the ankle joint. The fused ankle is pain-free and stable but does not bend. Surrounding joints compensate for some lost motion. Ankle fusion has been the gold standard for end-stage ankle arthritis for over 60 years. Best for: Young active patients, heavy laborers, those with poor bone quality, failed ankle replacement, ankle with significant deformity or bone loss.

Total Ankle Replacement (TAR)

Ankle replacement inserts metal and polyethylene components to recreate the ankle joint surface. It preserves ankle motion — typically 60-80% of normal range. Best for: Patients over 55, low-to-moderate activity level, good bone quality, minimal deformity, bilateral ankle arthritis. Modern implants (STAR, Infinity, In-Bone II) have improved outcomes significantly over earlier designs.

Key Differences

Making the Decision

This is one of the most important decisions in foot and ankle surgery. Key considerations:

• Age and activity: Younger, active patients do better with fusion. Older, moderate-activity patients benefit from replacement.
• Bilateral disease: If both ankles are affected, replacement preserves crucial motion.
• Bone quality: Replacement requires adequate bone stock for implant fixation.
• Surgeon experience: Ankle replacement outcomes are highly volume-dependent. Choose a surgeon who performs 20+ per year.
• Get a second opinion — preferably from a surgeon experienced in both procedures.

Frequently Asked Questions