Morton neuroma is painful thickening of the tissue around one of the nerves in the foot. It can affect any of the toes in the foot. However, it most often affects the nerves that run between the third and fourth or between the second and third toes.
The thickening of the nerve caused by inflammation and the build-up of fibrous tissue on the nerve's outer coating. This fibrous build-up is a reaction to the irritation resulting from nearby bones and ligaments rubbing against the nerves.
Irritation can be caused by:
Wearing shoes that are too tight
Wearing shoes that place the foot in an awkward position, such as with high heels
A foot that is mechanically unstable
Repetitive trauma to the foot such as from sports activities like tennis, basketball, and running
Trauma to the foot caused by an injury such as a sprain or fracture
It is unusual for more than one Morton neuroma to occur on one foot at the same time. It is rare for Morton neuroma to occur on both feet at the same time.
Morton neuroma is more common in women. Other factors that may increase your chance of Morton neuroma include:
Activities that cause repetitive trauma to the foot such as sports-related activities
Morton neuroma may cause:
Burning, pain, tingling, and numbness often shooting into the toes
Discomfort that is worse while walking
Feeling of a lump between the toes
Symptoms are usually temporarily relieved when:
Taking off the shoes
Flexing the toes
Rubbing the feet
The doctor will ask about your symptoms and medical history. A physical exam will be done. Initial diagnosis of Morton neuroma is based on your description of the type and location of pain and discomfort in the foot. The diagnosis will be confirmed by:
Physical exam of the foot, including:
Checking for mechanical abnormalities in the foot
Squeezing the side of the foot, which will usually cause pain when Morton neuroma is present
Examination of your shoes to:
Check for excess wear in parts of the shoe
Check to see whether the shoes are too tight
Imaging tests evaluate the foot and surrounding structures. This may be done with:
Injections of local anesthetic can also be used for diagnosis
Treatments may include:
Rehabilitation Measures to Reduce Nerve Irritation
Switching to low-heeled, wide-toed shoes with good arch support
Wearing padding in the shoes and/or between the toes
Wearing shoe inserts to correct a mechanical abnormality of the foot
Having ultrasound, electrical stimulation, whirlpool, and massage done on the foot
Injection of Medication
The foot may be injected with corticosteroids mixed with a local anesthetic in order to reduce pain. Relief may be only temporary, however, if the mechanical irritation is not corrected. Injections with other types of medications such as alcohol, phenol, or vitamin B12 are sometimes used.
Surgery to remove the neuroma may be recommended if more conservative treatment does not solve the problem. While surgery usually relieves or completely removes the symptoms, it often leaves a permanent numb feeling at the site of the neuroma.
To help reduce your chance of Morton neuroma:
Avoid wearing tight and/or high-heeled shoes.
Maintain or achieve ideal body weight.
If you play sports, wear roomy, properly fitting athletic footwear.
Morton's neuroma (intermetatarsal neuroma). Foot Health Facts—American College of Foot and Ankle Surgeons website. Available at: http://www.foothealthfacts.org/footankleinfo/mortons-neuroma.htm?terms=morton%27s%20neuroma. Accessed September 5, 2017.
Thomson CE, Gibson JN, Martin D. Interventions for the treatment of Morton's neuroma. Cochrane Database of Sys Rev. 2004;(3):CD003118.
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