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2015.06.17
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カテゴリ:カテゴリ未分類

Overview

A hallux abducto valgus deformity, commonly called a bunion, is a deformity characterized by medial deviation of the great toe, often erroneously described as an enlargement of bone or tissue around the joint at the head of the big toe. There is disagreement among medical professionals about the cause of bunions; some see them as primarily caused by the long-term use of shoes, particularly tight-fitting shoes with pointed toes, while others believe that the problem stems from genetic factors that are exacerbated by shoe use. Bunions occur when pressure is applied to the side of the big toe (hallux) forcing it inwards towards, and sometimes under or over, the other toes (angulation). As pressure is applied, the tissues surrounding the joint may become swollen and tender. In a survey of people from cultures that do not wear shoes, no cases of bunions were found, lending credence to the hypothesis that bunions are caused by ill-fitting shoes. The bump itself is partly due to the swollen bursal sac or an osseous (bony) anomaly on the metatarsophalangeal joint. The larger part of the bump is a normal part of the head of the first metatarsal bone that has tilted sideways to stick out at its top.

Causes
Although they may develop on the fifth (little) toe, bunions usually occur at the base of the big toe. Bunions are often caused by incorrect foot mechanics. The foot may flatten too much, forcing the toe joint to move beyond normal range. In some cases, joint damage caused by arhritis or an injury produces a bunion. And some people are simply born ith extra bone near a toe joint. If you're at risk for developing a bunion, wearing high-heeled or poorly fitting shoes make the problem worse. As new bone grows, the joint enlarges. This stretches the joint's outer covering. Force created by the stretching pushes the big toe toward the smaller ones. Eventually, the inside tendons tighten, pulling the big toe farther out of alignment.
SymptomsBunions may cause no pain at first. But as the big toe begins to turn in towards the other toes, people with bunions usually experience redness, pain, swelling, and tenderness in the area around the joint. Pressure inside the joint or from footwear pressing against the bunion may also cause discomfort. As the affected toe curves closer to the other toes on the foot, these toes can become painful as well. Complications of bunions include corns, calluses, hammer toe, and ingrown toenails. Other complications include irritation of the nerves surrounding the bunion area. Excess rubbing of the bunion against the footwear may lead to changes in the skin, resulting in corns or calluses. Hammer toe is a deformity of the toe immediately next to the big toe. A hammer toe is slightly raised and points upwards from the base and downwards at the end of the toe. Ingrown toenails can result from increased pressure from the big toe on the other toes. There may also be a decrease in the amount a person can move the joint affected by the bunion. Irritation of the nerves will feel like burning or decreased sensation.

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
Patients who suffer from bunions are usually referred to a surgeon. Unfortunately, surgery often makes the problem worse. Surgeons will use x-ray technology as a diagnostic tool, which does not always properly diagnose the pain source. Another problem with this approach is that it does not do anything to strengthen the weakened ligament in the foot and, thus, does not alleviate the chronic pain that people with this condition experience. Another standard practice of modern medicine is to use steroids or to prescribe anti-inflammatory medications. However, in the long run, these treatments do more damage than good. Cortisone shots and anti-inflammatory drugs have been shown to produce short-term pain benefit, but both result in long-term loss of function and even more chronic pain by actually inhibiting the healing process of soft tissues and accelerating cartilage degeneration. Plus, long-term use of these drugs can lead to other sources of chronic pain, allergies and leaky gut syndrome.


Surgical Treatment
If your bunion has progressed to the point where you have difficulty walking, or experience pain despite accommodating shoes, you may need surgery. Bunion surgery realigns bone, ligaments, tendons and nerves so your big toe can be brought back to its correct position. Orthopedic surgeons have several techniques to ease your pain. Many bunion surgeries are done on a same-day basis, requiring no hospital stay, using an ankle-block anesthesia. A long recovery is common and may include persistent swelling and stiffness.






最終更新日  2015.06.17 20:44:41
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