A triple arthrodesis is a surgical procedure that permanently fuses three joints in the back of the foot to eliminate pain and correct deformity. The three joints involved are the subtalar joint (where the ankle bone meets the heel bone), the talonavicular joint (where the ankle bone meets the navicular bone on the inner midfoot), and the calcaneocuboid joint (where the heel bone meets the cuboid bone on the outer midfoot). Together, these three joints control the side-to-side rocking and rotational movement of the hindfoot, so fusing them creates a stable, rigid platform for standing and walking.
What These Three Joints Do
Your hindfoot works like a complex hinge that lets your foot adapt to uneven ground, roll inward when you land a step, and push off when you walk. The subtalar joint is the main player, allowing the heel to tilt left and right beneath the ankle. The talonavicular and calcaneocuboid joints work alongside it, letting the midfoot twist and flex so the sole of your foot can flatten or arch as needed.
When arthritis, injury, or structural deformity damages these joints, every step can become painful. The cartilage that normally cushions the bones wears away, and the bones grind together. A triple arthrodesis eliminates that grinding by locking the bones in a corrected position and allowing them to grow together into solid bone.
Why This Surgery Is Performed
Triple arthrodesis is typically reserved for people who have exhausted nonsurgical options like bracing, orthotics, physical therapy, and anti-inflammatory medications. Common reasons for the procedure include:
- Severe flatfoot deformity that causes pain and instability, particularly when tendons supporting the arch have failed
- Post-traumatic arthritis following fractures of the heel bone (calcaneus) or other hindfoot injuries
- Rheumatoid arthritis or other inflammatory joint diseases that destroy cartilage across multiple hindfoot joints
- Neuromuscular conditions such as cerebral palsy, Charcot-Marie-Tooth disease, or polio that cause progressive foot deformity and muscle imbalance
- Tarsal coalition, a condition where bones in the hindfoot are abnormally connected, leading to stiffness and pain
The unifying theme is a hindfoot that is both painful and structurally unstable or severely misaligned. When only one of the three joints is affected, surgeons may fuse just that joint. Triple arthrodesis is chosen when the problem spans all three.
What Happens During Surgery
The surgeon makes one or two incisions on the outside and sometimes the inside of the foot to access all three joints. The remaining cartilage is removed from each joint surface, exposing raw bone underneath. This is essential because raw bone surfaces can heal together, while cartilage-covered surfaces cannot. In cases of significant deformity, the surgeon reshapes the bone to reposition the foot into proper alignment before locking everything in place.
Metal screws, staples, or plates hold the bones together while they fuse. In some cases, especially when bone quality is poor or a large gap needs to be filled, bone graft is packed into the joint spaces to encourage healing. The graft may come from the patient’s own body (often the shin or pelvis) or from a donor bone bank. The procedure is performed under general or regional anesthesia and typically takes one to two hours.
Recovery Timeline
Recovery from a triple arthrodesis is slow and demands patience. The bones need time to grow together, and putting weight on the foot too early can disrupt the fusion.
Immediately after surgery, the foot is placed in a splint or cast. For the first six weeks, you cannot put any weight on the operated foot. Getting around requires crutches, a walker, or a knee scooter. At the six-week mark, if X-rays show early healing, the cast is typically removed and replaced with a fracture boot, a padded walking boot that protects the foot while allowing some controlled movement.
Around three months after surgery, many patients begin putting weight on the foot gradually, increasing the load over several weeks until they can walk normally. Full recovery, meaning a return to comfortable daily activity with minimal swelling and stiffness, generally takes six months to a year. Physical therapy during this period focuses on restoring a smooth walking pattern, rebuilding calf and foot strength, and improving balance.
Life After a Triple Arthrodesis
Because the three fused joints no longer move, you will permanently lose the side-to-side motion in your hindfoot. In practical terms, this means walking on uneven terrain like gravel, grass, or hiking trails feels different and requires more attention. Running and high-impact sports are generally not recommended. Most people, however, find that the trade-off is worthwhile: the pain that dominated their daily life before surgery is gone or dramatically reduced.
Flat, supportive shoes with cushioned soles work best after fusion. Many people return to desk jobs, light physical work, and recreational walking without difficulty. The ankle joint above and the midfoot joints in front of the fusion still provide some motion, so the foot is not completely rigid. Your gait may look slightly different to a trained eye, but most patients walk without a noticeable limp once fully healed.
Risks and Complications
The most significant risk specific to this surgery is nonunion, where one or more of the three joints fails to fuse. When this happens, pain persists and a second surgery may be needed to re-prepare the joint surfaces and add bone graft. Smoking is one of the strongest risk factors for nonunion because nicotine constricts blood vessels and starves healing bone of oxygen and nutrients.
Malunion is another concern. This means the bones fuse successfully but in a less-than-ideal position, which can cause abnormal pressure on other parts of the foot. Nerve damage near the incision sites can cause numbness or tingling on the top or outer edge of the foot. Wound healing problems, infection, and blood clots are general surgical risks that apply here as well, particularly in patients with diabetes or poor circulation.
Over the long term, the joints above and below the fusion, especially the ankle, absorb extra stress because the fused joints can no longer share the load. This can accelerate wear on the ankle joint over a period of years or decades, potentially leading to ankle arthritis later in life. The risk is real but not inevitable, and for most patients, the immediate relief from hindfoot pain outweighs this long-term consideration.