Bunion surgery works by cutting and repositioning the metatarsal bone of the big toe, then holding it in its corrected alignment with screws, plates, or both. The exact technique depends on how severe the bunion is, but every approach shares the same goal: straighten the bone, remove the visible bump, and rebalance the soft tissues so the toe stays in place long term.
Why Surgery Involves More Than Shaving the Bump
A bunion isn’t just a bony lump that grew on the side of your foot. It forms when the long bone behind your big toe (the first metatarsal) gradually shifts outward, pushing the toe joint into a misaligned angle. The bump you see is the head of that displaced bone pressing against the inside of your shoe. Simply shaving it down wouldn’t fix the underlying misalignment, and the bump would eventually return.
That’s why nearly all modern bunion procedures involve an osteotomy, a controlled cut through the metatarsal bone that lets the surgeon reposition it. In many cases, the surgeon also tightens loose ligaments on one side of the toe and releases tight ones on the other to correct the soft tissue imbalance that helped cause the drift in the first place.
How Surgeons Choose the Right Procedure
Surgeons classify bunions by measuring two angles on an X-ray: the angle of the big toe itself (hallux valgus angle) and the angle between the first and second metatarsal bones (intermetatarsal angle). These numbers determine which technique will work best.
- Mild bunions (hallux valgus angle under 30°, intermetatarsal angle under 13°) are typically corrected with a distal osteotomy, where the bone is cut near the toe joint and shifted over.
- Moderate bunions (hallux valgus angle 30–40°, intermetatarsal angle 13–20°) often require a proximal osteotomy, cutting the bone farther back toward the midfoot for a larger correction.
- Severe bunions (hallux valgus angle above 40°, intermetatarsal angle above 20°) may need a double osteotomy, a Lapidus fusion, or a joint fusion at the base of the toe.
The Most Common Surgical Techniques
Distal Osteotomy
This is the workhorse procedure for mild to moderate bunions. The surgeon makes a cut through the metatarsal head (the rounded end near the toe joint), slides the top portion over to reduce the angle, and secures it with one or two small screws. The bump is trimmed off in the process. Because the cut is near the end of the bone, the correction is limited, but it’s effective for bunions that haven’t progressed too far.
Lapidus Procedure (Joint Fusion)
For more severe bunions, the problem often starts farther back in the foot, at the joint where the metatarsal meets the midfoot bones. When this joint is hypermobile (too loose), the entire metatarsal can drift and rotate out of position. The Lapidus procedure addresses this by removing the cartilage surfaces at that joint, rotating the metatarsal back into proper alignment, and then compressing the two bones together with a plate and screws. The joint fuses into a single solid structure over several weeks, permanently eliminating the instability that caused the bunion.
3D Correction
Traditional osteotomies shift the bone in one plane, essentially pushing it sideways on an X-ray. But bunions often involve rotation of the metatarsal in three dimensions. Newer procedures use specially designed instruments to rotate the bone back to its normal position in all three planes rather than just shifting it over. Titanium plates lock the correction in place. The idea is to address the root cause (the unstable, rotated joint) rather than just the visible bump.
Minimally Invasive Surgery
Instead of opening the foot with a longer incision, minimally invasive techniques use tiny incisions and a small rotating burr (about 2 millimeters in diameter) to cut the bone through the skin. The surgeon guides the procedure using a live X-ray monitor (fluoroscope) rather than direct visualization. This approach produces smaller scars, shorter operating times, and often a faster early recovery. One tradeoff: the fluoroscopy means more radiation exposure during the procedure, and the small burr can sometimes shorten the metatarsal slightly more than an open technique would.
A meta-analysis comparing minimally invasive and open approaches found that the minimally invasive group had better correction of the small bone position beneath the joint (the sesamoids), likely because of the real-time imaging guidance. Both approaches produce comparable alignment results overall.
What Happens on Surgery Day
Bunion surgery is almost always an outpatient procedure, meaning you go home the same day. You’ll typically receive regional anesthesia, nerve blocks around the ankle and foot that numb everything below. The surgeon targets specific nerves on the inner and outer sides of the ankle, injecting a small amount of local anesthetic around each one. You may also receive light sedation so you’re relaxed but not under full general anesthesia, though that varies by surgeon and patient preference.
The procedure itself usually takes between 45 minutes and two hours depending on the technique and complexity. Once the bone is cut and repositioned, the surgeon places hardware (screws, a plate, or both) to hold everything while it heals. The incision is closed with sutures, and your foot is wrapped in a bulky bandage to control swelling.
Recovery Timeline
Recovery is the part most people underestimate. The bone needs time to heal in its new position, and rushing it risks displacing the correction.
For the first few weeks, you’ll wear a protective surgical boot or shoe. Some procedures allow you to put partial weight on your foot right away in this boot, while others (especially the Lapidus fusion) require a period of staying completely off the foot using crutches or a knee scooter. Your surgeon will tell you which category you fall into based on what was done.
Between six and twelve weeks, most people start to regain normal foot function. Swelling decreases enough to transition into wider regular shoes, though your foot may continue to swell for several months, especially by the end of the day. You can generally return to full physical activity, including running and sports, around three months after surgery. Some residual stiffness in the big toe joint is normal during this period and gradually improves.
Success Rates and Recurrence
About 65 to 75 percent of patients report being very pleased with their surgical outcome. That also means roughly a quarter to a third of patients are less than fully satisfied, often because of lingering stiffness, a longer-than-expected recovery, or a result that didn’t meet cosmetic expectations. Pain relief tends to be more reliably achieved than a perfectly straight toe.
Recurrence is the most common long-term complication. Published recurrence rates range widely, from 8 to 73 percent depending on the study, the technique, and how recurrence is defined. In one long-term follow-up study using a distal osteotomy, the recurrence rate was 14 percent. The biggest risk factor for recurrence was having a more severe deformity to begin with. Patients whose preoperative angle was greater than 28° were roughly nine times more likely to see the bunion return compared to those with milder deformities. How well the initial correction holds at six weeks is also predictive: if the angle is already drifting back above 15° at that early check, recurrence becomes significantly more likely.
Procedures that address joint instability at the root, like the Lapidus fusion, are generally thought to have lower recurrence rates for severe bunions because they eliminate the hypermobile joint that allowed the bone to drift in the first place. Simpler osteotomies work well for mild cases but may not be enough to permanently correct a severely displaced metatarsal.