What Is Toe Fusion Surgery and When Is It Needed?

Toe fusion surgery, known medically as arthrodesis, permanently joins two bones in a toe joint by removing the damaged cartilage and fixing the bones together so they heal into one solid unit. It is most often performed on the big toe joint at the base (the first metatarsophalangeal joint) to treat severe arthritis, or on the smaller toe joints to correct deformities like hammertoes and claw toes. The procedure eliminates motion at the joint, which sounds dramatic, but for people living with grinding bone-on-bone pain or a toe that has curled into a rigid, unusable position, trading that motion for a stable, pain-free toe is a significant upgrade.

Conditions That Lead to Toe Fusion

The most common reason for big toe fusion is hallux rigidus, a form of osteoarthritis that stiffens and damages the joint where the big toe meets the foot. Hallux rigidus is the most frequent type of arthritis in the foot, and it tends to worsen over time as cartilage wears away and bone spurs build up.¹ In earlier stages, surgeons can clean out bone spurs (a procedure called cheilectomy), but once the cartilage loss is extensive, fusion becomes the go-to option.²

For the smaller toes, fusion targets the proximal interphalangeal joint, the middle hinge of the toe. Hammertoe and claw toe deformities bend the toe into abnormal positions that start out flexible but gradually stiffen. Once the joint is rigid and cannot be straightened manually, fusion is typically the surgical correction. The surgeon straightens the toe and locks it in place with hardware so the bones grow together permanently.³

Fusion is also used to correct severe bunion deformities (hallux valgus), where the first metatarsal bone drifts inward and the big toe angles outward. In these cases, surgeons sometimes fuse the joint at the base of the first metatarsal (the tarsometatarsal joint) rather than the big toe joint itself. And in revision scenarios, when a prior surgery like an implant or joint replacement has failed, fusion serves as the salvage procedure to restore function.

Why Conservative Treatment Comes First

Surgeons do not jump straight to fusion. Standard first-line approaches include stiff-soled shoes or rocker-bottom soles that limit painful bending, custom foot orthoses, anti-inflammatory medications, and sometimes corticosteroid or hyaluronic acid injections. The evidence for these non-surgical treatments, however, is underwhelming. A Cochrane systematic review found moderate-certainty evidence that arch-contouring orthoses, shoe-stiffening inserts, and a single injection of hyaluronic acid did not produce clinically important benefits over placebo or sham treatments.⁴ That does not mean these measures are worthless for every person, but it does explain why many patients with advancing arthritis eventually find themselves discussing surgery.

Fusion enters the picture when conservative measures have failed and the joint damage is advanced. The threshold is not a single X-ray finding or a pain score on a questionnaire. It is a clinical judgment that combines how much cartilage remains, how much the joint hurts during everyday activities, and how much the problem limits what you want to do with your life.

Alternatives to Fusion

For big toe arthritis that has not reached the end stage, cheilectomy removes the bone spurs and a portion of the metatarsal head to restore some motion. If arthritis later progresses, a prior cheilectomy does not seem to compromise the results of a later fusion. One study found no significant differences in patient-reported outcomes between people who went straight to fusion and those who had tried cheilectomy first.⁵ That is reassuring if you are on the fence: trying a less aggressive procedure first does not burn bridges.

Synthetic cartilage implants have emerged as a motion-preserving alternative. One such implant, made of polyvinyl alcohol hydrogel, is designed to act as a cushion between the worn bone surfaces. A study comparing this implant with fusion found that the implant group had somewhat better physical function scores, while pain relief was similar between the two procedures.⁶ However, a matched cohort study comparing the same implant with cheilectomy and fusion found no significant differences in activity scores, overall function, or patient satisfaction, and the revision rate was comparable across groups.⁷ The implant preserves joint motion, which matters for certain activities, but it does not clearly outperform fusion in overall results, and it costs more.

How the Surgery Is Done

Toe fusion surgery involves removing whatever damaged cartilage remains on the joint surfaces, preparing the bone ends so they make good contact, positioning the toe at the desired angle, and holding everything together with hardware while the bones heal into one piece. The goal is bony union: two bones becoming one.

For big toe fusion, the traditional approach uses an open incision along the top of the foot. The surgeon typically fixes the bones with a combination of screws and a dorsal plate (a small metal plate placed on the top surface of the joint). Newer minimally invasive techniques use smaller incisions and specialized instruments to achieve the same fixation with less soft-tissue disruption.⁸

For hammertoe fusion of the smaller joints, the historical workhorse has been the Kirschner wire (K-wire), a thin metal pin that sticks out of the toe tip and gets removed in the office a few weeks later. K-wires are simple and inexpensive, but they come with downsides: the exposed pin can catch on bedding, it carries an infection risk, and recurrent deformity is not rare. In one comparative study, roughly a quarter of toes treated with K-wires remained symptomatic, with about one in ten developing recurrent deformity and about 5% needing revision surgery. An intramedullary fusion device buried entirely inside the bone had lower complication and recurrence rates, and no patients in that group needed a second operation.⁹ A separate study of intramedullary implants found higher fusion rates and patient satisfaction compared to K-wires, though one specific implant design had a breakage rate of about 11% within the first year.¹⁰ The trend in hammertoe surgery is moving toward these internal devices, but your surgeon’s familiarity with a given implant matters as much as the device itself.

Pain Management During and After Surgery

Toe fusion can be performed under general anesthesia, spinal anesthesia, or regional nerve blocks that numb just the foot and ankle. Regional blocks using ultrasound guidance have become the preferred approach for many foot and ankle procedures because they provide targeted pain relief while avoiding the systemic effects of general anesthesia.¹¹ A peripheral nerve block can delay the onset of postoperative pain by many hours compared to spinal anesthesia, giving patients a more comfortable early recovery.¹² Modern protocols combine these blocks with non-opioid medications to minimize the need for narcotic painkillers after surgery.

Recovery Timeline

The traditional protocol after big toe fusion called for six weeks of non-weight-bearing in a cast or boot, followed by gradual protected weight-bearing. That prolonged period off your feet carries its own risks, including muscle wasting, bone thinning, and blood clot formation. More recent evidence suggests that immediate weight-bearing is feasible when strong fixation (like a locking plate plus compression screw) is used. In one retrospective study, patients who bore weight immediately after surgery achieved clinical healing at an average of about six weeks and showed solid fusion on X-rays at roughly seven weeks, without increased complication rates.¹³

In practical terms, most people wear a stiff-soled postoperative shoe or walking boot for the first several weeks. Swelling can linger for months. Return to driving depends on which foot was operated on and how quickly you regain comfort pressing pedals. Most surgeons clear patients for regular shoes somewhere between eight and twelve weeks, though some people transition sooner with an early weight-bearing protocol.

What Can Go Wrong

The most-discussed complication is nonunion, meaning the bones fail to fuse. A large ten-year retrospective study found a nonunion rate of about 6% after big toe fusion.¹⁴ Wound complications occurred in roughly 8-9% of cases. Several factors raised the risk of nonunion:

Peripheral neuropathy: Patients with nerve damage in the feet had substantially higher nonunion risk, with an adjusted odds ratio near seven for idiopathic peripheral neuropathy.
Obesity: A BMI above 30 roughly doubled the odds of nonunion.
Diabetes: A separate analysis of similar data found that diabetes approximately tripled the relative risk of nonunion.¹⁵
Bilateral fusions done separately: Having the other foot fused at a different time also increased nonunion risk.

Interestingly, smoking history and osteoporosis did not show a statistically significant association with nonunion in these data, which runs counter to what many patients expect to hear. That said, smoking is still broadly harmful to bone healing across many surgical contexts, so it would be premature to treat this as a green light.

Other potential complications include infection, hardware irritation requiring removal, nerve injury causing numbness near the incision, and malposition (the toe heals at an angle that causes problems with shoe fit or gait).

How Walking Changes After Fusion

When the big toe joint is fused, the toe can no longer bend upward during the push-off phase of walking. Your foot compensates. Gait studies show that after big toe fusion, pressure shifts away from the big toe and toward the lesser metatarsals. The hindfoot and forefoot adjust their rotation patterns to work around the stiff joint.¹⁶ A prospective study tracking patients before and after surgery confirmed that big toe dorsiflexion at toe-off dropped from about 20 degrees preoperatively to about 8 degrees postoperatively, while compensatory motion occurred at neighboring joints in the foot. Despite these mechanical changes, patients in that study showed improved stride length, walking speed, and self-reported function scores, suggesting the overall effect on walking was positive even though the joint itself no longer moved.¹⁷

The pressure shift toward the smaller toes is real and measurable, but it was typically already present before surgery because the arthritic joint was already limiting big toe function. Different postoperative shoe inserts and orthoses can help distribute pressure more evenly. One study comparing four orthosis types found that a wedge-style device produced the lowest peak pressure under the foot, though patients ranked it as the least comfortable option, a classic tradeoff.¹⁸

Getting Back to Sports, Shoes, and Everyday Life

One of the biggest questions people have before toe fusion is whether they will be able to stay active afterward. The data here are genuinely encouraging. A retrospective study of young, active patients found that they returned to 84% of their pre-surgery activities within 12 months, and 42% got back to activities within six months. Compared to before surgery, patients rated about a quarter of their activities as less difficult, about half as unchanged, and roughly a fifth as more difficult.¹⁹

A more recent study looking specifically at alpine sports found that 96% of patients returned to sport by 12 months. Skiers and snowboarders all returned to the same or a higher level. The catch: about 40% of skiers needed boot modifications, and 42% of the overall group required some type of shoe modification for their sport.²⁰ If you are an athlete considering this surgery, the fusion itself is unlikely to end your sport, but you should plan on experimenting with footwear to find what works.

Heeled footwear is another common concern. Among patients who wore heels before surgery, about 62% continued wearing them afterward. Of those who kept wearing heels, the vast majority could wear the same height as before, and most tolerated heel heights of 1.5 inches or more. The average comfortable wear time was about three hours continuously.²¹ So heels are not automatically off the table, but roughly a third of former heel-wearers gave them up after surgery.

Patient Satisfaction

The satisfaction numbers for big toe fusion are high by orthopedic standards. A large survey of over 200 patients found that about 88% reported little to no pain after surgery, 82% were happy with the cosmetic appearance of their toe, and 76% could wear any type of shoe most or all of the time. Over 90% said they would have the surgery again, and 86% would recommend it to family or friends.²² Those numbers reflect the reality that fusion trades motion you have already largely lost for pain relief you desperately want. By the time most people reach the operating table, the arthritic joint was barely moving anyway.

When Fusion Fails and Revision Is Needed

The roughly 6% of patients who develop nonunion may remain asymptomatic (a fibrous union that does not hurt) or may need revision surgery. Revision is more complex than the original procedure because bone stock has often been lost from the first attempt. One approach uses bone graft harvested from the pelvis (the iliac crest) to bridge the gap. A study of 72 revision patients treated this way achieved radiographic union in about 93% initially, rising to 97% after secondary grafting in a few cases. The trade-off was a high complication rate: roughly 44% experienced at least one complication, and about 7% needed further surgery.²³ Outcomes were less favorable in patients with significant medical comorbidities or larger bone defects.

Custom 3D-printed titanium implants are an emerging option for salvage cases where the bone loss is too extensive for standard grafting. These implants are manufactured from CT scans of the patient’s foot, allowing precise replacement of the missing bone structure. The porous surface is designed to encourage bone ingrowth.²⁴ This technology is still relatively new and used primarily for complex reconstruction, but it illustrates how the field is evolving to handle the most difficult cases.

Does Fusing One Joint Damage the Neighbors

A reasonable worry is that locking one joint will overload the joints next to it and accelerate arthritis there. Preliminary data from a large registry study offer some reassurance, at least for a related procedure (first tarsometatarsal fusion for bunion correction). Among 154 patients with radiographic follow-up, about 7% had developed adjacent joint arthritis, suggesting that a successful fusion does not appear to rapidly accelerate wear in nearby joints.²⁵ Longer-term data from larger groups will sharpen this picture, and it is worth noting that a 7% rate is not zero. But it is far lower than many patients fear.

Cost-Effectiveness

Big toe fusion performs well in economic analyses. A UK-based lifetime cost-effectiveness model using national registry data found that the procedure produced meaningful quality-of-life gains at a cost well below the thresholds that health systems consider acceptable. In the most favorable cost scenario, the surgery actually became cost-saving by about 18 years after the procedure, meaning the health gains outweighed the costs entirely.²⁶

Compared to synthetic cartilage implants, fusion is also the more cost-effective choice. One US-based analysis calculated total direct costs of about $3,600 for fusion versus about $4,600 for the implant (factoring in revision rates for each). Fusion remained more cost-effective even in scenarios that assumed a higher failure rate for fusion and zero failures for the implant.²⁷ The implant would have to drop in price by roughly 28% just to reach cost parity with fusion. For health systems and insurers making coverage decisions, these numbers help explain why fusion remains the gold standard despite the appeal of newer motion-preserving options.