Minimally invasive bunion surgery — what it is, who it suits, and honest answers

If you are researching bunion surgery in Hampshire, you will have come across the phrase "minimally invasive" or "keyhole" bunion surgery. It is a genuine advance in foot surgery. It is also heavily marketed, and not every claim you read online is supported by evidence. This page explains what the operation involves, who it suits, what recovery really looks like, and the risks — so you can make an informed decision, whoever you choose to treat you.

I am Mr Togay Koç, a consultant orthopaedic foot and ankle surgeon at University Hospital Southampton, an Honorary Senior Clinical Lecturer at the University of Southampton, and a committee member of the British Orthopaedic Foot and Ankle Society (BOFAS). I see private patients in Southampton.

First, what is a bunion?

A bunion (the medical term is hallux valgus) is a deformity of the big toe joint. The big toe drifts towards the smaller toes and a bony bump forms on the inside of the foot. Bunions tend to run in families. Footwear can aggravate them but does not usually cause them on its own.

Not every bunion needs surgery. If your bunion does not hurt, surgery is rarely justified — operating on a painless bunion purely for appearance carries real risks with limited benefit. Wider shoes, pads and insoles help many people manage symptoms without an operation. Surgery is worth discussing when pain limits your walking, work or daily life despite these measures.

What is minimally invasive bunion surgery?

Minimally invasive surgery (often shortened to MIS, and sometimes called keyhole or percutaneous surgery) corrects the same deformity as traditional open surgery, but through several very small incisions — each typically a few millimetres long — instead of one larger cut.

Through these small openings, the surgeon uses a specialised burr to cut and realign the bones, guided throughout by live X-ray imaging in the operating theatre. The realigned bones are then usually fixed with small screws while they heal. A common modern technique combines a cut in the first metatarsal with a cut in the big toe bone itself; your surgeon may refer to this as a minimally invasive chevron and Akin osteotomy.

The operation is usually done as a day case. Depending on your health and preference, it can be performed under general anaesthetic or with an anaesthetic block that numbs the foot.

How does it differ from open surgery?

The correction achieved is intended to be the same. The main differences are the route in and the soft-tissue handling:

• Incisions. Several small cuts rather than one longer one, so scars are smaller.
• Soft tissue. Less surgical dissection around the joint, which may mean less early swelling and pain for some patients.
• Imaging. The surgeon relies on X-ray guidance during the operation rather than direct sight of the bone.

What the evidence shows is worth stating carefully. Published studies, including randomised trials comparing minimally invasive and open techniques, suggest that correction of the deformity and patient-reported outcomes at one to two years are broadly similar. Some studies suggest less pain in the early weeks after keyhole surgery. No high-quality evidence shows that one approach produces better long-term results than the other. In other words: MIS is a different route to a similar destination, not a shortcut to a better outcome.

The technique also has a learning curve. Results reported in the literature come from surgeons trained and experienced in the method. It is reasonable — and expected — for you to ask any surgeon about their training and experience with it.

Who does it suit — and who does it not?

Minimally invasive techniques can now be used for mild, moderate and many severe bunions. But they are not right for everyone. Situations where MIS may not be suitable include:

• Significant arthritis in the big toe joint. If the joint itself is worn out, realigning the bones will not fix the pain. A different operation, such as a joint fusion, may be more appropriate.
• Very severe or complex deformities, or bunions associated with instability elsewhere in the foot, which may need a different or additional procedure.
• Poor bone quality, poor circulation or certain medical conditions that affect healing.
• Revision surgery after a previous bunion operation, which often needs an individualised plan.

The honest answer to "am I suitable?" requires an examination and weight-bearing X-rays. No surgeon can tell you which operation you need from a photograph.

What does recovery really look like?

Recovery from bunion surgery — keyhole or open — is measured in weeks and months, not days. A realistic outline:

• Weeks 0–2: You can usually walk from day one in a stiff-soled post-operative shoe, keeping the foot elevated as much as possible to control swelling.
• Weeks 2–6: Gradually more time on your feet, still in the surgical shoe. Many people with desk-based jobs return to work in this period; jobs involving standing or manual work take longer.
• Around 6 weeks: Most patients move into a comfortable, roomy ordinary shoe, guided by X-ray checks of bone healing.
• 3 months: Return to impact exercise such as running is typically considered from around this point, if healing allows.
• Up to 12 months: Swelling can take this long to settle fully. This surprises many patients, so it is worth knowing in advance.

These are typical timelines, not promises. Healing varies from person to person.

The risks, stated honestly

All surgery carries risk, and bunion surgery is no exception. Possible complications include:

• Infection (usually minor, occasionally deeper and needing further treatment)
• Numbness or nerve irritation around the scars or toe, which can be permanent
• Delayed healing or non-union of the bone cuts
• Recurrence of the bunion over time
• Over-correction of the toe
• Stiffness of the big toe joint
• Prominent or irritating screws, sometimes needing removal in a further procedure
• Transfer pain under the ball of the foot
• Blood clots (deep vein thrombosis or pulmonary embolism) — uncommon but serious
• Complex regional pain syndrome — a rare, persistent pain condition
• Ongoing pain or dissatisfaction despite a technically successful operation

Most patients do well, but a minority have complications, and a small number are left worse off. No honest consultation should leave you believing surgery is risk-free. Part of a good consultation is deciding together whether the likely benefit justifies these risks for you — and sometimes the right advice is not to operate.

Questions to ask any surgeon (including me)

• Is surgery actually necessary for my bunion, or are there non-surgical options left to try?
• Which operation are you recommending for my foot, and why that one?
• What is your training and experience in minimally invasive techniques?
• What are the specific risks in my case, and how are complications handled if they occur?
• What will my recovery look like given my job, home situation and activities?
• What happens if I choose to do nothing?

You should expect clear answers. If anything feels rushed or over-sold, seek a second opinion — from anyone.

Next steps

If bunion pain is limiting your life and you would like an honest assessment of whether surgery — minimally invasive or otherwise — is right for you, you can book a consultation at my clinic in Southampton. A consultation, examination and weight-bearing X-rays are the only reliable way to find out which options genuinely suit your foot. Self-pay and insured patients are welcome.