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Overview

Hallux abductovalgus (HAV) or bunion, is a commonly seen deformity of the first metatarsophalangeal joint (MPJ) in which the hallux is abducted and everted, frequently overriding the second toe. Although the terms HAV and bunion are often used synonymously (as is done in this paper), it should be noted that a bunion actually refers to the callus and inflamed adventitious bursa overlying the HAV deformity. Even though bunions have been described in the medical literature for several hundred years (the word bunion is believed to be derived from the Latin, bunio, meaning turnip), there continues to be much controversy concerning its etiology. This is most likely because the development of HAV is multifactorial, stemming from a variety of structural and functional aberrancies.

Causes
Bunions are most widely considered to be due to an imbalance in the forces that is exerted across the joint during walking. The resulting abnormal motion and pressure over the joint, over many years (combined with poor fitting footwear) leads to instability in the joint causing hallux valgus and bunions. Bunions are really only a symptom of faulty foot mechanics and are usually caused by a combination of the way we walk, the foot we inherit and inappropriate footwear use.
SymptomsJust because you have a bunion does not mean you will necessarily have pain. There are some people with very severe bunions and no pain and people with mild bunions and a lot of pain. Symptoms for a bunion may include pain on the inside of your foot at the big toe joint, swelling on the inside of your foot at the big toe joint, appearance of a "bump" on the inside edge of your foot. The big toe rolling over to one side. Redness on the inside of your foot at the big toe joint. Numbness or burning in the big toe (hallux). Decreased motion at the big toe joint. Painful bursa (fluid-filled sac) on the inside of your foot at the big toe joint. Pain while wearing shoes - especially shoes too narrow or with high heels. Joint pain during activities. Other conditions which may appear with bunions include Corns in between the big toe and second toe. Callous formation on the side or bottom of the big toe or big toe joint. Callous under the second toe joint. Pain in the second toe joint.

Diagnosis
Generally, observation is adequate to diagnose a bunion, as the bump is obvious on the side of the foot or base of the big toe. However, your physician may order X-rays that will show the extent of the deformity of the foot.

Non Surgical Treatment
Follow the advice given by a Podiatrist. Use felt pads to help keep pressure off the painful area of the bunions. Wear shoes that are wide and deep to accomodate the bunions. Fitting of footwear is very important. Avoid the use of high heel shoes. Use exercises to keep the joint mobile. Night splints may help with the bunion symptoms. The aim of these are to hold the toe in a more correct position. Padding or foam between the big toe and the second toe is sometimes recommended, it should, generally, not be recommended as the big toe is usually so strong it just further 'squeezes' the lesser toes and can lead to problems between these toes. The padding between the two toes will not straighten the big toe. However, sometimes the padding may be needed to help with symptoms that originate inside the joint if the bunion is painful.


Surgical Treatment
Bunion surgery involves realigning the joint into a better position. The procedure is usually performed under a general anaesthetic so the patient is not awake during the operation. A bunion causes a prominent bone over the inside of the joint between the foot and the big toe known as the 1st metatarso-phalangeal joint. It gives the appearance of the big toe pointing in towards the others. Surgery is a last resort treatment option in severe cases where walking or wearing shoes is painful.