What Causes Bunions

Overview

Bunions are the most common deformity that affects the big toe. A bunion is characterized by angling of the big toe towards the lesser toes, and a painful bump over the inside part of the base of the big toe. This prominence (an area called the medial eminence) is caused by angling inwards of the metatarsal bone, and is not an actual growth of bone.

Causes
Long periods of pressure from a tight-fitting shoe can cause the inflammation and the pain. This often happens when the big toe is forced into a position where it presses inward and overlaps the second toe. The base of the big toe then is pushed beyond normal alignment of the foot, resulting in the prominence typical of a bunion.
SymptomsNo matter what stage your bunion is in, you can be in pain. Though bunions take years to develop, you can experience pain at any stage. Some people don?t have bunion pain at all. Pain from a bunion can be severe enough to keep you from walking comfortably in normal shoes. The skin and deeper tissue around the bunion also may become swollen or inflamed.

Diagnosis
When an x-ray of a bunion is taken, there is usually angulation between the first metatarsal bone and the bones of the big toe. There may also be angulation between the first and second metatarsal bones. These angular irregularities are the essence of most bunions. In general, surgery for bunions aims to correct such angular deformities.

Non Surgical Treatment
Bunion pain can be successfully managed in the vast majority of cases by switching to shoes that fit properly and don't compress the toes. Your orthopaedic surgeon can give you more information about proper shoe fit and the types of shoes that would be best for you. Follow these general points of shoe fit. Do not select shoes by the size marked inside the shoe. Sizes vary among shoe brands and styles. Judge the shoe by how it fits on your foot. Select a shoe that conforms as nearly as possible to the shape of your foot. Have your feet measured regularly. The size of your feet change as you grow older. Have both feet measured. Most people have one foot larger than the other. Fit to the largest foot. Fit at the end of the day when your feet are the largest. Stand during the fitting process and check that there is adequate space (3/8" to 1/2") for your longest toe at the end of each shoe. Make sure the ball of your foot fits well into the widest part (ball pocket) of the shoe. Do not purchase shoes that feel too tight, expecting them to "stretch" to fit. Your heel should fit comfortably in the shoe with a minimum amount of slippage. Walk in the shoe to make sure it fits and feels right. (Fashionable shoes can be comfortable.) Some shoes can be modified by stretching the areas that put pressure on your toes. Splints to reposition the big toe and orthotics (special shoe inserts shaped to your feet) also may relieve pain. For bunions caused by arthritis, medications can be prescribed to reduce pain and swelling.


Surgical Treatment
For those whose bunions cause persisting pain, a surgical operation is considered for correction of the bunion. The surgical operation to correct a bunion is referred to as a bunionectomy. Surgical procedures can correct deformity and relieve pain, leading to improved foot function. These procedures typically involve removing bony growth of the bunion while realigning the big toe joint. Surgery is often, but not always, successful; failure to relieve pain can result from the big toe moving back to its previous deviated position even after surgery. However, proper footwear and orthotics can reduce the chances of surgical failure.