What Causes Mortons Neuroma

Overview

Morton’s neuroma is named after Dr Morton who first described this condition in 1876. It is sometimes called Morton’s metatarsalgia or interdigital neuroma. It is a condition that affects one of the common plantar digital nerves that run between the long bones (metatarsals) in the foot. It most commonly affects the nerve between the third and fourth metatarsal bones, causing pain and numbness in the third and fourth toes. It can also affect the nerve between the second and third metatarsal bones, causing symptoms in the second and third toes. Morton’s neuroma rarely affects the nerve between the first and second, or between the fourth and fifth, metatarsal bones. It tends to affect only one foot. It is rare to get two neuromas at the same time in the same foot.

Causes

The exact cause is as yet unclear. However there are a number of theories. Some expert s believe problems with the design of the foot makes some people more prone to Morton?s neuroma. Having flat feet or a high arch for example encourages the foot to slide forwards which can put excess pressure on the metatarsals. Bunions and hammer toes also increase the likelihood of developing Morton?s. However simply wearing high heels or any form of tight shoes that put pressure on the bones in the feet can also lead to a Morton?s . Typically the condition comes on between the age of 40 and 50. It is far more common in women than men – three out of four sufferers are women.

Symptoms

Patients with neuroma may develop pain on the bottom of the forefoot, most commonly under the 3rd and 4th toes, though any toe may be affected. The pain may be dull and mild or severe and sharp. The toes may feel ?numb? as times, especially the area between the 3rd and 4th toes. A classic complaint is that patients feel as if they are ?walking on a stone or pebble? and/or ?feel as if the sock is rolled up in the shoe.? Pain is often worse when walking barefoot.

Diagnosis

Patients with classic Morton?s neuroma symptoms will have pain with pressure at the base of the involved toes (either between the 2nd and 3rd toes, or between the 3rd and 4th toes). In addition, squeezing the front of the foot together can exacerbate symptoms. As well, they may have numbness on the sides of one toe and the adjacent toe, as this corresponds with the distribution of the involved nerve.

Non Surgical Treatment

Pain is the main reason that you seek treatment for a neuroma. Analgesics may help. Inflammation it best eased via ice therapy and techniques or exercises that deload the inflammed structures. Anti-inflammatory medications may help. Your physiotherapist will use an array of treatment tools to reduce your pain and inflammation. These include: ice, electrotherapy, acupuncture, deloading taping techniques, soft tissue massage and orthotics to offload the irritated nerve. One of the biggest factors in relieving pain may be changing or modifying your footwear. This may mean adding felt, foam or gel products to your shoe to help offload the area, or looking at avoiding tight fitting heels or shoes.

Surgical Treatment

Surgery to excise the neuroma is usually performed under general anaesthetic in a day surgery facility. After surgery you will have to keep your foot dry for two weeks. Generally neuroma surgery allows for early weight bearing and protection in some type of post op shoe gear. Some neuromas may reoccur, but this is rare. Most studies on patient satisfaction after neuroma surgery show approximately 90% reduction of pain and about 85% of all patients rated the overall satisfaction with the results as excellent or good.