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2015.07.02
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カテゴリ:カテゴリ未分類

Overview
A Hammertoes is a deformity of the second, third or fourth toe in which the toe becomes bent at the middle joint; hence, it resembles a hammer. Claw toe and mallet toe are related conditions. While a hammer toe is contracted at the first toe joint, a mallet toe is contracted at the second toe joint, and a claw toe is contracted at both joints. According to the 2012 National Foot Health Assessment conducted by the NPD Group for the Institute for Preventive Foot Health, 3 percent of U.S. adults age 21 and older (about 7 million people) have experienced hammer toe or claw toe. The condition is significantly more prevalent in females than in males.

Causes
But what causes the imbalance of the tendons and muscles in the first place so that they begin to pull and bend the joint? A bad fitting shoe could be the cause but it usually isn?t the primary cause. Many people are genetically predisposed to hammertoe, and the condition begins to progress more quickly when they wear shoes that fit poorly, for example pointy toes, high heels, or shoes that are too short. Hammertoe may also be caused by damage to the joint as a result of trauma.

Symptoms
Common symptoms of hammertoes include pain or irritation of the affected toe when wearing shoes. corns and calluses (a buildup of skin) on the toe, between two toes, or on the ball of the foot. Corns are caused by constant friction against the shoe. They may be soft or hard, depending upon their location. Inflammation, redness, or a burning sensation. Contracture of the toe. In more severe cases of hammertoe, open sores may form.

Diagnosis
The exam may reveal a toe in which the near bone of the toe (proximal phalanx) is angled upward and the middle bone of the toe points in the opposite direction (plantar flexed). Toes may appear crooked or rotated. The involved joint may be painful when moved, or stiff. There may be areas of thickened skin (corns or calluses) on top of or between the toes, a callus may also be observed at the tip of the affected toe beneath the toenail. An attempt to passively correct the deformity will help elucidate the best treatment option as the examiner determines whether the toe is still flexible or not. It is advisable to assess palpable pulses, since their presence is associated with a good prognosis for healing after surgery. X-rays will demonstrate the contractures of the involved joints, as well as possible arthritic changes and bone enlargements (exostoses, spurs). X-rays of the involved foot are usually performed in a weight-bearing position.

Non Surgical Treatment
There are many non-surgical treatments to help relieve symptoms of hammertoe. The first step for many people is wearing the right size and type of shoe. Low-heeled shoes with a boxy or roomy toe area are helpful. Cushioned insoles, customized orthopedic inserts, and pads can provided relief as well. Splints or straps may be used to help correct toe position. Your doctor may show you toe stretches and exercises to perform. Your doctor can safely remove corns and calluses. You should not try to remove them at home.

Surgical Treatment
Probably the most frequent procedure performed is one called a Post or an Arthroplasty. In this case a small piece of bone is removed from the joint to straighten the toe. The toe is shortened somewhat, but there is still motion within the toe post-operatively. In other cases, an Arthrodesis is performed. This involves fusing the abnormally-contracted joint. The Taylor procedure fuses only the first joint in the toe, whereas the Lambrinudi procedure fuses both joints within the toe. Toes which have had these procedures are usually perfectly straight, but they take longer to heal and don't bend afterwards. A Hibbs procedure is a transfer of the toe's long extensor tendon to the top of the metatarsal bone. The idea of this procedure is to remove the deforming cause of the hammertoes (in this case, extensor substitution), but to preserve the tendon's function in dorsifexing the foot by reattaching it to the metatarsals. Fortunately, the Gotch (or Gotch and Kreuz) procedure--the removal of the base of the toe where it attaches to the foot, is done less frequently than in years past. The problem with this procedure is that it doesn't address the problem at the level of the deformity, and it causes the toe to become destabilized, often resulting in a toe that has contracted up and back onto the top of the foot. You can even have an Implant Arthroplasty procedure, where a small, false joint is inserted into place. There are several other procedures, as well.






最終更新日  2015.07.03 00:34:15
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