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2015.07.11
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カテゴリ:カテゴリ未分類

Overview
A Hammertoes is a toe that becomes permanently bent in the middle so that the end of the toe points downward. The portion of the toe before the joint where the bend occurs tends to arch upward. A hammer toe takes years to develop. Once the toe becomes permanently bent, corns or calluses may form. Treatment helps control symptoms in many people, but surgery is sometimes needed to straighten the toe.

Causes
Many people develop hammertoe because they wear shoes that are too tight. Shoes with narrow toe boxes squeeze the toes together, forcing some to bend. This causes the toe muscles to contract. If the toes are forced into this cramped position too often, the muscles may permanently tighten, preventing the toes from extending. Chronic hammertoe can also cause the long bones that connect the toes to the foot, called metatarsals, to move out of position. The misaligned metatarsal bones may pinch a nerve running between them, which can cause a type of nerve irritation called a neuroma.

Symptoms
At first, a hammertoe or mallet toe may maintain its flexibility and lie flat when you're not wearing crowded footwear. But eventually, the tendons of the toe may contract and tighten, causing your toe to become permanently stiff. Your shoes can rub against the raised portion of the toe or toes, causing painful corns or calluses.

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
Non-surgical methods for hammer toes (claw toes) are aimed at decreasing symptoms (i.e., pain and/or calluses) and/or limiting the progression into a larger problem. Simple treatments patients can do are wear supportive shoes. Use an arch support. Wear shoes with a wide toe box. Modify activities. Spot stretch shoes. Periodic callus care.

Surgical Treatment
If these treatments are not sufficient at correcting the hammer toe, an operation to straighten the toe may be necessary. This is often performed in conjunction with surgery for a bunion deformity. The surgical treatment of a hammer toe can consist of either cutting the tendons to relieve the pressure that causes the deformity, or fusing the toe so that it points straight permanently.






最終更新日  2015.07.11 10:51:28
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