Hallux valgus, often referred to as "a bunion," is a deformity of the big toe. The toe tilts over towards the smaller toes and a bony lump appears on the inside of the foot. (A bony lump on the top of the big toe joint is usually due to a different condition, called hallux rigidus.) Sometimes a soft fluid swelling develops over the bony lump. The bony lump is the end of the "knuckle-bone" of the big toe (the first metatarsal bone) which becomes exposed as the toe tilts out of place. Causes
Bunions occur with greater regularity in women than men, and they may sometimes run in families. You may also have an increased likelihood of bunions if you are born with certain bone abnormalities in your feet. Factors that may increase your chances of developing a bunion include long-term use of narrow-toed and/or high-heeled footwear. Arthritis. Toe trauma. Laxity of your connective tissues (ligament laxity). Limb length inequalities. Genetics. Certain foot problems (e.g. flatfoot, over-pronation, etc.).
Symptoms
Many people do not experience symptoms in the early stages of bunion formation. Symptoms are often most noticeable when the bunion gets worse and with certain types of footwear. These include shoes that crowd the toes and/or high-heeled shoes. When symptoms do occur, they may include physical discomfort or pain. A burning feeling. Redness and swelling. Possible numbness. Difficulty walking.
Diagnosis
Your family doctor or chiropodist /podiatrist can identify a bunion simply by examining your foot. During the exam, your big toe will be moved up and down to determine if your range of motion is limited. You will be examined for signs of redness or swelling and be questioned about your history of pain. A foot x-ray can show an abnormal angle between the big toe and the foot. In some cases, arthritis may also be seen. A X-ray of your foot may help identify the cause of the bunion and rate its severity.
Non Surgical Treatment
Separating the big toe and the next one with a 1 cm thick piece of foam can relieve painful symptoms. This can be fixed in place with some zinc oxide plaster tape and has the effect of straightening the great toe and relieving pressure on the bunion. A taping technique will support the joint and relieve the pressure on the inside of the foot. Off the shelf orthotic insoles can be worn to help correct any biomechanical problems in the foot which may be causing the problem. If the foot rolls in or over pronates then this causes the arch of the foot to flatten and more pressure is placed on the base of the big toe where the bunion forms. A podiatrist is a therapist who specializes in feet. They can do a full gait analysis and make orthotic inserts to correct biomechanical foot problems. Severe cases may require surgery to realign the joint but this is a last resort if conservative treatment has failed.
Surgical Treatment
If the above simple measures do not make you comfortable, an operation may improve the situation. An operation will not give you an entirely normal foot, but it will correct the deformity of the big toe and narrow your foot back towards a more desirable shape. There are a lot of different operations for bunions, depending on the severity of the deformity, the shape of your foot and whether arthritis has developed in the big toe joint. An orthopaedic surgeon who specialises in foot & ankle surgery can advise you on the best operation for your foot. However, an operation may not make your foot narrow enough to wear tight shoes, nor can it fully restore the strength of the big toe.
Prevention
To minimize the chance of developing bunions, never force your feet into shoes that don?t fit. Choose a shoe that conforms to the shape of your foot. Opt for shoes with wider insteps, broad toes, and soft soles. Shoes that are short, tight, or sharply pointed should be avoided.