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
While there isn?t really one exact cause of bunions, podiatric physicians tend to agree that a bunion is formed when the normal mechanics of the foot are disrupted. This can happen in any number of ways. Abnormality in foot function or foot mechanics. In general, this means a pronated foot (one with an excessive rolling to the outside when the patient is walking, running or doing any kind of activity), a flat foot or low-arched foot. This is probably the most common cause, and it?s where the idea of heredity comes into play. Foot mechanics, and problems with them, tend to run in families. The good news is that there are orthoses and corrective shoes that can effectively alleviate these and other disturbances to foot mechanics, before they contribute to bunions. A podiatric physician can prescribe the best corrective footwear and shoe inserts for all activities, work, exercise, play, walking, shopping and more, based on an analysis of the patient?s foot and his or her lifestyle.
SymptomsThe signs and symptoms of a bunion include a bulging bump on the outside of the base of your big toe, swelling, redness or soreness around your big toe joint, Thickening of the skin at the base of your big toe, Corns or calluses, these often develop where the first and second toes overlap, persistent or intermittent pain, restricted movement of your big toe. Although bunions often require no medical treatment, see your doctor or a doctor who specializes in treating foot disorders (podiatrist or orthopedic foot specialist) if you have persistent big toe or foot pain, a visible bump on your big toe joint, decreased movement of your big toe or foot, difficulty finding shoes that fit properly because of a bunion.
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
Many people with bunions are quite comfortable if they wear wide, well fitting shoes and give them time to adapt to the shape of their feet. A small pad over the bony prominence, which can be bought from a chemist or chiropodist, can take the pressure of the shoe off the bunion. High heels tend to squeeze the foot into the front of the shoe and should be avoided. It is often worthwhile seeing a chiropodist if these simple measures are not quite enough.
Surgical Treatment
The primary goal of bunion surgery is to relieve the pain associated with the deformity. This is accomplished by correcting the underlying abnormal metatarsal position by realigning it toward the second toe. Removing excessive bone formation on the bunion "bump", releasing the soft tissue tightness which is pulling the big toe towards the second toe. Tightening the soft tissues which are overly stretched on the bump side of the joint. Re-establish the correct alignment of the cartilage surfaces. Move the sesamoid bones into correct alignment. Realign the great toe. Bunion surgery procedures are based on many factors, including health, age and lifestyle of the patient. However, a critical factor in procedure choice is the grading of the bunion deformity.