Overview
A neuroma is a painful condition, also referred to as a ?pinched nerve? or a nerve tumor. It is a benign growth of nerve tissue frequently found between the third and fourth toes. It brings on pain, a burning sensation, tingling, or numbness between the toes and in the ball of the foot. The principal symptom associated with a neuroma is pain between the toes while walking. Those suffering from the condition often find relief by stopping their walk, taking off their shoe, and rubbing the affected area. At times, the patient will describe the pain as similar to having a stone in his or her shoe. The vast majority of people who develop neuromas are women.
Causes
A Morton?s Neuroma are a result of complex biomechanical changes that occur in your feet. There are a number of theories as to the exact cause of the scarring and thickening, but it basically boils down to overload of the tissue structure. The body lays down scar tissue to try to protect the overloaded structure. Tight-fitting shoes may exacerbate a Morton?s Neuroma. Shoes such as high heels and shoes with tight toe boxes (eg womens fashion shoes and cowboy boots) are particularly damaging to the toes. These shoes have a sloping foot bed and a narrow toe box. The slope causes the front of the foot to bear your weight. The angle of the toe box then squeezes your toes together. Footwear is not the only cause of a Morton?s Neuroma. Injuries to the foot can also be a factor in developing the condition by changing your foot biomechanics. Poor foot arch control leading to flat feet or foot overpronation does make you biomechanically susceptible to a neuroma.
Symptoms
It usually occurs in between the 3rd and 4th toes (about 65% of cases) as is pictured to the right. It is less commonly found in the 2nd webspace, and rarely at all in the 1st or 4th webspaces. You can also experience pins and needles and/or numbness as a result of the nerve being affected. The condition tends to occur predominantly in middle aged females.
Diagnosis
The diagnosis of a Morton’s neuroma can usually be made by the doctor when the history of pain suggests it and the examination elicits the symptoms. The foot is generally tender when the involved area is compressed and symptoms of pain and sometimes tingling can be elicited when the sides of the foot are squeezed. Magnetic resonance imaging (MRI) or ultrasound testing can be used to confirm the diagnosis if necessary.
Non Surgical Treatment
Symptoms of a Morton’s neuroma can completely resolve with simple treatments, such as resting the foot, better-fitting shoes, anti-inflammation medications, and ice packs. More rapid relief of symptoms can follow a local cortisone injection. Symptoms can progressively worsen with time. For those with persistent symptoms, the swollen nerve tissue is removed with a surgical operation.
Surgical Treatment
Operative treatment of Morton?s neuroma should be entertained only after failure of nonoperative management. Standard operative treatment involves identifying the nerve and cutting (resecting) it proximal to the point where it is irritate/injured. This is usually done through an incision on the top (dorsal) aspect of the foot, although in rare instances, an incision on the sole (plantar) aspect of the foot maybe used. An incision on the sole of the foot works very well, unless an excessive scar forms in which case it can be problematic. Some physicians will attempt to treat Morton?s neuroma by releasing the intermetatarsal ligament and freeing the nerve of local scar tissue. This may also be beneficial.
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