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Overview

A bunion is generally considered as an enlargement of the joint (a lump of bone) at the base and side of the big toe (specifically, the first metatarsophalangeal joint). Bunions form when the toe moves out of place. As the big toe bends towards the others this lump becomes larger and the bunion can become painful, arthritis and stiffness can eventually develop. Hallux valgus or hallux abducto valgus (HAV) is the name used for the deviated position of the big toe and a bunion refers to the enlargement of the joint, most of the time the two go together and can just be referred to as 'bunions'. The word bunion is from the Latin "bunion," meaning enlargement.

Causes
There are many factors which can contribute to the development of a bunion. The common causes are genetic factors, poor foot mechanics, high-heeled or narrow footwear and trauma to the toe. It is believed that constant stress on the joint of the big toe causes mild displacement of the bones and the joint, along with thickening of the tissues and a change in the pull of the muscles. This can result in a degree of arthritis of the joint, and over time, further displacement of the toe. This may lead to pain, difficultly with fitting shoes and corns/calloused lesions due to excess pressure on the smaller digits.
SymptomsPatients with bunions will often display pain over the prominent bump on the inside of their forefoot (the medial eminence?). However, they may also have pain under the ball of the foot (under the area near the base of the second toe). Symptoms can vary in severity from none at all to severe discomfort aggravated by standing and walking. There is no direct correlation between the size of the bunion and the patient?s symptoms. Some patients with severe bunion deformities have minimal symptoms, while patients with mild bunion deformities may have significant symptoms. Symptoms are often exacerbated by restrictive shoe wear, particularly shoes with a narrow toe box or an uncomfortable, stiff, restraining upper.

Diagnosis
The doctor considers a bunion as a possible diagnosis when noting the symptoms described above. The anatomy of the foot, including joint and foot function, is assessed during the examination. Radiographs (X-ray films) of the foot can be helpful to determine the integrity of the joints of the foot and to screen for underlying conditions, such as arthritis or gout. X-ray films are an excellent method of calculating the alignment of the toes when taken in a standing position.

Non Surgical Treatment
There are a number of treatment options for bunions. Non-surgical treatments are usually tried first, including painkillers, orthotics (insoles) and bunion pads. However, these can only help to reduce the symptoms of bunions, such as pain. They don't improve the appearance of your foot.


Surgical Treatment
In cases where joint pain and deformity are severe, joint replacement surgery may be recommended. This may particularly be recommended when arthritis is present in the joint. Surgery may be carried out under a local, regional or general anaesthetic. Most cases are performed as a day stay procedure. However, an overnight stay in hospital may be required if the surgery is more extensive. The type of surgery to be performed, the type of anaesthetic to be used and the expected hospital stay should be discussed with your surgeon prior to surgery.