Morton neuromas are focal areas of symptomatic perineural fibrosis around a plantar digital nerve of the foot. The abnormality is non-neoplastic and does not represent a true neuroma. It may more correctly be known as Morton?s metatarsalgia. The condition is thought to be due to chronic entrapment of the nerve by the intermetatarsal ligament. It most often occurs in middle-aged individuals and is many times more common in women than men. Approximately 30% of asymptomatic middle-aged persons have the radiological pathologic findings of a Morton?s neuroma.
Poorly fitted footwear can be a cause. Shoes that have a tight and narrow toe box can cause the never to become entrapped causing the pain. High heeled shoes abnormally place the metatarsals under extreme pressure which can cause Morton?s Neuroma. In cases of abnormal pronation, there can be significant motion between the 3rd and 4th metatarsals which can cause an irritation to the nerve that runs between them. This inflammation causes the pain.
The symptoms of Morton?s Neuroma tend to come and go over time. They are typically exacerbated by physical activity or by wearing certain shoes. Morton?s Neuroma symptoms include sharp pain in the ball of the foot, pain radiating to the tips of the toes, burning pain in the second, third, or fourth toes, numbness in the toes, sensation of a lump between the toes.
Your doctor will suspect that you have a Morton's neuroma based on the nature and location of your foot pain. He or she may ask questions about your shoes - what type of shoes you usually wear and whether these shoes have narrow toes or high heels. To rule out other causes of foot pain, your doctor may ask questions about your medical history, especially any history of arthritis, nerve and muscle problems or previous injury to your foot or leg.
Non Surgical Treatment
Most non-operative treatment is usually successful, although it can take a while to figure out what combination of non-operative treatment works best for each individual patient. Non-operative treatment may include the use of comfort shoe wear. The use of a metatarsal pad to decrease the load through the involved area of the plantar forefoot. A period of activity modification to decrease or eliminate activities, which may be exacerbating the patient?s symptoms. For example, avoiding long periods of standing or other activities that result in significant repetitive loading to the forefoot can be very helpful. Wearing high heels should be avoided. Local can help decrease inflammation associated with the nerve. However, this does not necessarily address the underlying loading forces that maybe causing the injury to the nerve in the first place. It has been proposed that an alcohol injection in and around the nerve will cause a controlled death to the nerve and subsequently eliminate symptoms. In theory, this may be helpful. In practice, adequate prospective studies have not demonstrated the benefit of this procedure above and beyond the other standard, non-operative treatments available. In addition there is the concern that the alcohol will cause excessive scarring and damage to other important structures in the area.
Should the problem have progressed beyond the point where these measures are sufficient, the podiatric professional may recommend surgery. This procedure involves excision of the involved nerve mass. This will relieve the pain. Many patients report permanent numbness in the spot formerly affected by the neuroma, but prefer it to the pain. Most surgeries are successful; unfortunately, there are cases where the patient suffers another neuroma, sometimes in or near the same spot as before. A podiatric professional can explain the statistics of recurrence in various cases. If you suspect a neuroma, don?t wait for it to get better on its own. The earlier the diagnosis, the higher the likelihood that it can be treated with conservative measures. Don?t think that foot pain of any kind is inevitable, either, even if it runs in your family.