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2015.06.12
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カテゴリ:カテゴリ未分類

Overview

A bunion is a bone deformity caused by an enlargement of the joint at the base and side of the big toe ( metatarsophalangeal joint ). Bunions form when the toe moves out of place. The enlargement and its protuberance cause friction and pressure as they rub against footwear. The growing enlargement or protuberance then causes more irritation or inflammation. In some cases, the big toe moves toward the second toe and rotates or twists, which is known as Hallux Abducto Valgus. Bunions can also lead to other toe deformities, such as hammertoe.

Causes
Bunions, Corns, and Calluses are all related in that they can each be caused by tight and/or poor fitting footwear. Each can also be caused by the following, footwear that is too narrow and/or too small. Constrictive toe boxes (toe area). Tapered toe boxes can cause bunions and cause them to worsen to the point of needing surgery.
SymptomsIf you have a bunion, you may have pain or stiffness of your big toe joint, swelling of your big toe joint, difficulty walking, difficulty finding shoes that fit. These symptoms may be caused by conditions other than bunions, but if you have any of these symptoms, see your doctor.

Diagnosis
A thorough medical history and physical exam by a physician is necessary for the proper diagnosis of bunions and other foot conditions. X-rays can help confirm the diagnosis by showing the bone displacement, joint swelling, and, in some cases, the overgrowth of bone that characterizes bunions. Doctors also will consider the possibility that the joint pain is caused by or complicated by Arthritis, which causes destruction of the cartilage of the joint. Gout, which causes the accumulation of uric acid crystals in the joint. Tiny fractures of a bone in the foot or stress fractures. Infection. Your doctor may order additional tests to rule out these possibilities.

Non Surgical Treatment
You can buy orthotics over the counter from pharmacies, or they can be custom-made by a podiatrist to fit your feet. Whether you need to buy an over-the-counter orthotic or have one specially made will depend on your individual circumstances and the severity of your bunion. You can also use special bunion splints, worn over the top of your foot and your big toe to help straighten its alignment. Splints are available for both daytime and night-time use. However, there's little evidence that splints are effective. Toe spacers are also available, which can help reduce the pain caused by bunions. However, toe spacers or orthotics may be of limited use because they often compete with the bunion for the already limited space in the shoe. If your toe joint is painful and swollen, applying an ice pack to the affected area several times a day can help to relieve the pain and inflammation. Never apply ice directly to your skin. Wrap it in a cloth or tea towel. A bag of frozen vegetables makes a good ice pack. It's recommended that you wear flat or low-heeled, wide-fitting shoes if you have a bunion. Shoes made from soft leather are ideal because they'll relieve any pressure on the bunion. Avoid narrow or slip-on shoes. High heels can also make your bunion worse by putting excessive pressure on your toes.


Surgical Treatment
Surgery is a last option for those with advanced and painful bunions that do not respond to any other treatment. The surgical operation to correct the deformity from a bunion is called a bunionectomy, which typically involves removing bony growth of the bunion, re-positioning ligaments and tendons, and realigning the bones of the toe joint. Surgery is usually a day procedure performed with a local anaesthetic. The bones may be stabilised in their new position with screws or pins. Hardware may even include absorbable pins that are broken down by the body after a few months. You can expect a 6 - 8 week recovery period during which crutches are usually required. Surgery is often successful but sometimes the big toe moves back to its previous deviated position. Proper footwear and orthotics reduces the chances of surgical failure.

Prevention
The best protection against developing bunions is to protect and care for your feet every day. Avoid tight and narrow-fitting shoes. Limit your use of high heels. Wear comfortable shoes with adequate space between your longest toe and the end of the shoe. Getting treatment for very flat or very high-arched feet (if you are experiencing symptoms) will give your feet the proper support and help maintain stability and balance.






最終更新日  2015.06.12 11:14:15
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