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  Foot 

Tarsal Tunnel syndrome

The tarsal tunnel is a narrow space that lies on the inside of the ankle next to the ankle bones. The tunnel is covered with a thick ligament (the flexor retinaculum) that protects and maintains the structures contained within the tunnel—arteries, veins, tendons, and nerves. One of these structures is the posterior tibial nerve, which is the focus of tarsal tunnel syndrome.

Tarsal tunnel syndrome is a compression, or squeezing, on the posterior tibial nerve that produces symptoms anywhere along the path of the nerve. The posterior tibial nerve runs along the inside of the ankle into the foot.

Tarsal tunnel syndrome is similar to carpal tunnel syndrome, which occurs in the wrist. Both disorders arise from the compression of a nerve in a confined space.Although tarsal tunnel syndrome may not be as well known as carpal tunnel syndrome, it is nevertheless a cause of foot and ankle pain in adults.

  Symptoms

Patients with tarsal tunnel syndrome experience one or more of the
following symptoms:

  • Tingling, burning, or a sensation
    similar to an electrical shock
  • Numbness
  • Pain, including shooting pain

The symptoms are typically felt on the inside of the ankle and/or on the bottom of the foot. In some people, a symptom may be isolated and occur in just one spot. In others, it may extend to the heel, arch, toes, and even the calf.

Sometimes the symptoms of the syndrome appear suddenly. Often they are brought on or aggravated by overuse of the foot—such as in prolonged standing, walking, exercising, or beginning a new exercise program.

It is very important to seek early treatment if any of the symptoms of tarsal tunnel syndrome occur. If left untreated, the condition progresses and may result in permanent nerve damage. In addition, because the symptoms of tarsal tunnel syndrome can be confused with other conditions, proper evaluation is essential so that correct diagnosis can be made.

Tarsal tunnel syndrome is caused by anything that produces compression on the posterior tibial nerve, such as:

  • A person with flat feet is at risk for developing tarsal tunnel
    syndrome, because the outward tilting of the heel that occurs with “fallen arches" can produce strain and compression on the nerve.

  • An enlarged or abnormal structure that occupies space within the tunnel can compress the nerve. Some examples include a varicose
    vein, ganglion cyst, swollen tendon, and arthritic bone spur.

  • An injury, such as an ankle sprain, may produce inflammation and
    swelling in or near the tunnel, resulting in compression of the nerve.

  • A person who is overweight may be prone to experiencing pressure
    on the posterior tibial nerve.

  • Systemic diseases such as diabetes or arthritis can cause swelling, thus compressing the nerve.

The doctor at A+ clinic foot will examine the foot to arrive at a diagnosis and determine if there is any loss of feeling. During this examination, the surgeon will position the foot and tap on the nerve to see if the symptoms can be reproduced. He or she will also press on the area to help determine if a small mass is present.

Sometimes an MRI is ordered, usually if a mass is suspected or in cases where initial treatment does not reduce the symptoms. In addition, special studies used to evaluate nerve problems—electromyography and nerve conduction velocity (EMG/NCV)—may be ordered if the condition shows no improvement with non-surgical treatment.

Treatment

A variety of treatment options, often used in combination, are available to treat tarsal tunnel syndrome.

These include:

  • Rest. Staying off the foot prevents further injury and encourages healing.

  • Ice. To reduce swelling in the tarsal tunnel, apply a bag of ice over a thin towel to the affected area for 20 minutes of each waking hour. Do not put ice directly against the skin.

  • Oral medications. Nonsteroidal anti-inflammatory drugs (NSAIDs),such as ibuprofen, help reduce the pain and inflammation.

  • Immobilization. Restricting movement of the foot by wearing a cast is sometimes necessary to enable the nerve and surrounding tissue to heal.

  • Physical therapy. Ultrasound therapy, exercises, and other forms of physical therapy may be prescribed to reduce symptoms.

  • Injection therapy. Injections of a local anesthetic provide pain relief, and an injected corticosteroid may be useful in treating
    the inflammation.

  • Orthotic devices. Custom shoe inserts may be prescribed to help maintain the arch and limit excessive motion that can cause compression on the nerve.

  • Shoes. Supportive shoes, as recommended by your foot and ankle surgeon, may prove helpful.

  • Bracing. Patients with flatfoot or those with severe symptoms and nerve damage may be fitted with a brace to reduce the amount of
    pressure on the foot.

  • Surgery. Sometimes surgery is the best option for treating tarsal tunnel syndrome. The doctor at A+ clinic will determine if surgery is necessary and will select the appropriate procedure or procedures based on the cause of the condition.

      
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