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Bunions (hallux valgus): keyhole foot surgery

When a bunion hurts and limits you, the bone is corrected. Today, through incisions of a few millimetres, walking the same day.

Normal foot Bunion Bunion

What a bunion is

A bunion, or hallux valgus, is not a bone that grows: it is a progressive deviation. The first metatarsal drifts inwards and the big toe leans towards the other toes, so the head of the metatarsal sticks out on the inner side of the foot. That is the "bump" that rubs against the shoe.

There is a clear hereditary tendency (foot shape runs in families), and narrow or high-heeled shoes, flat feet and joint laxity speed the deformity up. Over time the big toe stops pushing off when you walk, the load shifts to the neighbouring metatarsals and calluses and pain under the sole (metatarsalgia) and hammer toes appear, most often in the second toe.

Normal foot Hallux valgus (bunion) Bunion Metatarsal and big toe aligned Bone drifts in, toe drifts out Right foot seen from above; the inner side is on the left

Left, a normal forefoot. Right, hallux valgus: the first metatarsal drifts inwards, the big toe leans outwards and the head of the bone sticks out: that is the bunion.

When surgery is worth it

Bunions are not operated on for cosmetic reasons. Surgery aims to remove the pain, give the big toe its function back and stop the damage to the rest of the forefoot. It is considered when:

  • The bunion hurts and limits your footwear or activity despite wide shoes and insoles
  • There is rubbing, an inflamed bursa or repeated sores over the bump
  • The deformity is progressing and the second toe is starting to overlap or curl
  • Pain or calluses appear under the sole because the other metatarsals are overloaded

The decision is made in consultation with an examination of the foot and weight-bearing X-rays (taken standing), which show the true deformity and allow the correction to be planned.

Keyhole surgery: how it is done

Percutaneous or minimally invasive surgery (MIS) corrects the deformity through incisions of two to three millimetres, without opening the joint. Under X-ray guidance in the operating theatre, the first metatarsal is cut and shifted into its correct position (an osteotomy), the big toe's phalanx is corrected when needed, and the correction is held with percutaneous screws. It is performed under a regional anaesthetic block of the foot with sedation, and you go home the same day.

Before After Bone cut (osteotomy) Bunion Percutaneous screw Head repositioned Incisions of 2 to 3 mm

Before: the deviated bone and the cut line. After: the head is shifted outwards, under the toe, and held with a screw. All through 2 to 3 mm incisions.

The technique of choice in most cases

Keyhole surgery (MIS)

Osteotomies through 2 to 3 mm incisions, fixed with screws.

  • Walking the same day in a post-operative shoe
  • Less pain and less stiffness than open surgery
  • Scars that are barely visible
  • Corrects mild, moderate and many severe bunions

Open surgery

An incision of several centimetres with direct correction of the deformity.

  • Still indicated in some very severe deformities or when the joint is arthritic
  • Somewhat slower recovery and more wound care
  • The technique is chosen to suit the foot, not the other way round
Intra-operative X-ray of a bunion corrected with keyhole surgery, showing the screw that holds the head of the first metatarsal

Intra-operative X-ray at the end of the correction: the head of the first metatarsal repositioned and held with a percutaneous screw.

On video

Video: keyhole bunion surgery with Arthrex screw fixation

The keyhole bunion technique with screw fixation (Arthrex system). Plays here when you press it, in YouTube's cookie-free mode. Open on YouTube.

Recovery, step by step

These timings are a guide: every foot and every person has their own pace, and they are adjusted at the check-ups.

Post-operative shoe with a flat rigid sole, open toe and velcro straps

The post-operative shoe we use: a flat, rigid sole to bear weight from day one, an open toe and two velcro straps that adjust to the dressing. Worn for the first weeks.

Other forefoot problems treated with keyhole surgery

The same technique, with tiny incisions and early weight-bearing, is used for other common foot problems, often in the same operation as the bunion:

Frequently asked questions

Do insoles or toe spacers correct a bunion?

No. They ease the pain and reduce rubbing, but they do not move the bone back into place. When the bunion hurts and limits you despite those measures, surgery is the only way to correct it.

Is the operation painful?

It is done under a regional block of the foot with sedation, so the operation itself is painless. Afterwards, discomfort is managed with standard painkillers and is usually less than after open surgery because of the size of the incisions.

When can I walk?

The same day, in the post-operative shoe. For the first weeks, short distances and the foot elevated; normal footwear returns progressively, guided by the check-up and the control X-ray.

Can both feet be done at once?

In selected cases yes, because you bear weight from day one. It is decided in consultation; it is often more comfortable to operate on the more painful foot first and the other a few months later.

Can it come back?

There is a small risk of recurrence, higher if not every component of the deformity is corrected or if narrow shoes are resumed. A complete correction planned on weight-bearing X-rays reduces that risk.

Educational content written and reviewed by Dr. Joel Gambín Botella (registered physician no. 460311992). It does not replace a medical assessment: diagnosis and treatment decisions require an in-person consultation.

A bunion that now hurts in every shoe?

At the first visit the foot is examined, weight-bearing X-rays are taken and we decide whether surgery is worth it and with which technique.

Or by phone: +34 681 87 65 04

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