Subtalar Fusion: Procedure, Recovery, and Long-Term Outcomes
Updated: 2 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026
Quick Answer: What is subtalar fusion?
Subtalar fusion, also called subtalar arthrodesis, is a surgery that joins the ankle bone and heel bone into a single unit, mainly to treat severe subtalar arthritis when nonsurgical treatments fail. The surgeon removes damaged cartilage and secures the bones with screws over about two hours. It permanently reduces side-to-side foot movement but eliminates the friction causing chronic pain.
What the research says
Most fusions heal, and arthroscopic surgery may heal slightly faster. A meta-analysis of 12 studies of primary isolated subtalar fusion with bone grafts found a pooled union rate of 93% after open surgery and 100% after arthroscopic surgery, with time to union of 13.8 versus 12.2 weeks. Function scores and complication rates did not differ between the two approaches (Lalevee et al., EFORT Open Rev, 2026) [2].
The surgical approach did not change early complications in a randomized trial. Among 51 patients randomized to open (25) or arthroscopic (26) fusion, early complications occurred in 12% of each group, and function, pain, and satisfaction over 12 months did not differ significantly (Stegeman et al., Acta Orthop, 2024) [3].
A previous ankle fusion makes nonunion more likely. A meta-analysis of only 3 studies found a pooled nonunion rate of 38% (95% CI 18.2%–59.8%) when the subtalar joint was fused beneath an existing ankle fusion, compared with 4%–22.8% reported for isolated subtalar fusion (Meyer et al., J Foot Ankle Surg, 2026) [4].
What is subtalar fusion?
The subtalar joint sits just below the ankle joint. It connects the talus, often called the ankle bone, with the calcaneus, or heel bone. [1] This joint is essential for balance and for the side-to-side tilting of the foot that lets you walk on uneven surfaces. [1] When it is damaged, usually by severe arthritis or an injury, the resulting pain can limit mobility and daily activities.
Subtalar fusion is a definitive surgical treatment for this chronic pain. The surgeon permanently joins the two bones so they heal into one solid bone, a process known as arthrodesis. It is usually recommended only after conservative treatments, such as physical therapy, specialized footwear, or injections, have not provided enough relief. By removing motion from a diseased joint, the surgery takes away the source of painful friction and damage.
When is subtalar fusion needed, and how do you prepare?
The most common reason for subtalar fusion is severe foot arthritis. [1] When the cartilage that cushions the joint wears away, the bones rub directly against each other, causing inflammation, stiffness, and intense pain. Other reasons include congenital deformities, severe flatfoot, and changes after a fracture.
Preoperative Steps
Step | Purpose |
|---|---|
Physical examination | To assess overall health and readiness for surgery. |
Imaging tests | X-rays, MRI, or CT scans to show the extent of joint damage. |
Medication review | To identify supplements or drugs that must be paused. |
Fasting | Follow your surgical team's instructions on when to stop eating and drinking before surgery. |
Smoking | Stopping is usually advised, because smoking raises the risk of wound problems, blood clots, and a fusion that does not heal. [1] |
Preparation starts with a full consultation in which the surgeon looks at how your symptoms affect your quality of life. Be open about your pain levels and the activities you have started to avoid. Imaging is essential to map the damage and plan the operation.
What happens during subtalar fusion surgery?
Subtalar fusion is usually done as an outpatient procedure, so most patients go home the same day. The surgery typically lasts about two hours and is performed under general or regional anesthesia. Depending on your needs and the extent of the joint damage, the surgeon may choose an open approach or a minimally invasive arthroscopic technique.
The surgeon makes incisions to reach the subtalar joint and removes any remaining damaged cartilage and diseased bone to prepare the surfaces for fusion. [1] Surgical screws are then placed through the talus and calcaneus to hold them in precise alignment. [1] These screws, which are normally permanent, give the stability the bones need to grow together over the following months. Once the hardware is secure, the incisions are closed and the foot is placed in a protective brace or boot.
What are recovery and rehabilitation like after subtalar fusion?
Healing after subtalar fusion is gradual and takes patience. In the first weeks the goal is to protect the surgical site while the bones begin to fuse. Most patients must stay non-weight bearing for several weeks and use crutches or a walker to move safely. [1]
Recovery Milestone | Estimated Timeline |
|---|---|
Initial healing | 1–2 weeks (incision care and swelling management). |
Bone fusion | 8–12 weeks (the bones grow together into one unit). |
Physical therapy | Begins once your surgeon confirms it is safe, to restore strength. |
Full recovery | Several months for a complete return to activity. |
Physical therapy plays a vital role. Once the surgeon decides it is safe, a physical therapist guides you through exercises to regain strength and adapt to the new mechanics of your foot. Side-to-side motion will be permanently reduced, but most patients find that the large drop in pain makes walking and daily movement much more comfortable.
What are the outcomes and success rates of subtalar fusion?
Subtalar fusion is considered a highly effective procedure, with success rates of roughly 85% reported. A successful result means a significant, lasting reduction in pain and a return to routine physical activities. In pooled studies the bones themselves fuse in about nine out of ten cases. [2] The fusion does change how the foot moves, but for people with disabling arthritis the stability and comfort gained often outweigh the loss of side-to-side flexibility.
Potential Risks
Complications are uncommon, but it is important to understand the risks of any major surgery. The most common problem specific to this operation is nonunion, which happens when the bones do not fuse as intended. [1] A second operation may then be needed. Smoking and a previous ankle fusion both make nonunion more likely. [1] [4] Other general surgical risks include infection, bleeding, and reactions to anesthesia. [1] Watch your recovery closely and tell your healthcare provider right away about any sign of infection, such as fever or unusual discharge.
Conclusion
Subtalar fusion is a transformative option for people living with severe, long-lasting foot pain that has not responded to conservative care. By permanently joining the bones of the subtalar joint, the procedure removes painful friction and gives the foot a stable foundation. With a high success rate and a clear path to recovery, it gives patients a reliable way to regain mobility and improve their quality of life.
What are the next steps for subtalar fusion?
If persistent foot pain is getting in the way of your daily routine, the first step is to see an orthopaedic specialist or a podiatric surgeon. They can run the tests needed to find out whether your subtalar joint is the source of the problem. Talking through your goals and how your symptoms affect you will help you and your provider decide whether subtalar fusion is the right path for your long-term health and comfort.
Related reading on Rinnit: Physical Therapy: Enhancing Mobility, Strength, and Recovery
Frequently Asked Questions
Is subtalar fusion a major surgery?
Yes. It is a significant procedure that permanently joins two major bones in the foot to relieve chronic pain.
Will I be able to walk normally after surgery?
Most patients walk comfortably after recovery and rarely limp, although they have less side-to-side flexibility in the foot.
How long does the fusion process take?
It typically takes 8 to 12 weeks for the talus and calcaneus to grow together into a single bone, and full recovery takes several months.
Is the hardware permanent?
The surgical screws used to join the bones are usually permanent unless they later cause irritation or discomfort.
What is the success rate of the procedure?
Success rates of roughly 85% have been reported for relieving pain and improving function, and pooled studies show the bones fuse in about nine out of ten cases.
Can I drive after subtalar fusion?
Driving is restricted until you are off prescription pain medicine and have enough strength and control in your foot, usually after several weeks.
Will I need physical therapy?
Yes. Physical therapy is an important part of recovery and helps you regain strength and adapt to the changed mechanics of your foot.
What happens if the bones do not fuse?
Failure of the bones to fuse is called nonunion. If it happens, a follow-up surgery may be needed to help the bones join.
Is the surgery performed under general anesthesia?
Most procedures use general anesthesia, although regional anesthesia may also be used to numb the area.
Can I still exercise after recovery?
Most patients can return to their usual physical activities, including exercise, once they have fully healed.
What is the most common reason for this surgery?
Severe foot arthritis that has worn away the cartilage is the most common reason for subtalar fusion.
How long is the hospital stay?
Subtalar fusion is usually an outpatient procedure, so most patients go home the same day.
Will my foot feel stiff after surgery?
You will have a permanent loss of side-to-side motion, which may feel like stiffness, but the joint pain should be gone.
When should I call my doctor after surgery?
Call right away if you have a high fever, signs of infection at the incision, or worsening pain.
Are there alternatives to fusion?
Nonsurgical options include injections, bracing, specialized footwear, and physical therapy. These are usually tried before surgery is recommended.
How do I prepare for subtalar fusion?
Stop all nicotine use at least one month before surgery and until the fusion has healed, because smoking raises the risk of blood clots, wound-healing problems and fusion failure [1]. Skin problems at the surgical site, an active infection or poor overall health may lead your surgeon to delay the operation [1]. Plan ahead for a walking aid such as crutches, a walker or a knee scooter, since you will keep weight off the foot in a boot or cast for 8 to 12 weeks or longer and a cane is not acceptable until your surgeon clears it, and do not plan to drive until fully healed if your right foot is operated on [1].
Related Reading
References
Fellars T. Subtalar Fusion. FootCareMD, American Orthopaedic Foot & Ankle Society. Accessed October 11, 2026. https://www.footcaremd.org/conditions-treatments/ankle/subtalar-fusion
Lalevee M, Rodaix C, Van Rooij F, et al. Arthroscopic subtalar arthrodesis using grafts grants higher union rates and faster time to union: systematic review and meta-analysis. EFORT Open Rev. 2026;11(6):446-455. PMID 42227239. https://doi.org/10.1530/EOR-2025-0059
Stegeman M, Pruijn N, Susan S, et al. Open versus arthroscopic fusion of the subtalar joint: a randomized controlled trial. Acta Orthop. 2024;95:723-729. PMID 39656213. https://doi.org/10.2340/17453674.2024.42448
Meyer C, Cooperman S, Brandão R. Subtalar joint nonunions following isolated ipsilateral ankle arthrodesis a systematic review and meta analysis. J Foot Ankle Surg. 2026;65(2):71.e1-71.e5. PMID 41223930. https://doi.org/10.1053/j.jfas.2025.11.005
Medical Disclaimer
This article is for informational purposes only and does not constitute medical advice. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or treatment.
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