Morton's neuroma is the common name given to the nerve irritation that is found in the ball of the foot that may or may not be accompanied by an inter-metatarsal bursae (a bursa-neuromal complex). It is often associated with inflammation or degeneration and often occurs with constant pressure or irritation of the nerve from the surrounding bony structures or local bursas (fluid filled sacs). Morton's Neuroma can cause symptoms such as a sharp pain, burning even a lack of feeling in the ball of the foot and associated toes.
The exact cause of Morton's neuroma is not known. However, it is thought to develop as a result of long-standing (chronic) stress and irritation of a plantar digital nerve. There are a number of things that are thought to contribute to this. Some thickening (fibrosis) and swelling may then develop around a part of the nerve. This can look like a neuroma and can lead to compression of the nerve. Sometimes, other problems can contribute to the compression of the nerve. These include the growth of a fatty lump (called a lipoma) and also the formation of a fluid-filled sac that can form around a joint (a bursa). Also, inflammation in the joints in the foot next to one of the digital nerves can sometimes cause irritation of the nerve and lead to the symptoms of Morton's neuroma.
Neuroma pain is classically described as a burning pain in the forefoot. It can also be felt as an aching or shooting pain in the forefoot. Patients with this problem frequently say they feel like they want to take off their shoes and rub their foot. This pain may occur in the middle of a run or at the end of a long run. If your shoes are quite tight or the neuroma is very large, the pain may be present even when walking. Occasionally a sensation of numbness is felt in addition to the pain or even before the pain appears.
Podiatrists conduct a physical examination and may order imaging tests, such as x-ray or MRI scan to diagnose Morton's neuroma. Conservative treatment options include custom-fitted orthotics, medication, and/or alcohol injections designed to harden the nerve. However, most patients with Morton's neuroma need minor surgery.
Non Surgical Treatment
Treatment options vary with the severity of each neuroma, and identifying the neuroma early in its development is important to avoid surgical correction. For simple, undeveloped neuromas, a pair of thick-soled shoes with a wide toe box is often adequate treatment to relieve symptoms, allowing the condition to diminish on its own. For more severe conditions, however, additional treatment or surgery may be necessary to remove the tumor. The primary goal of most early treatment regimens is to relieve pressure on areas where a neuroma develops. Your podiatric physician will examine and likely X-ray the affected area and suggest a treatment plan that best suits your individual case. Padding and Taping. Special padding at the ball of the foot may change the abnormal foot function and relieve the symptoms caused by the neuroma. Medication. Anti-inflammatory drugs and cortisone injections can be prescribed to ease acute pain and inflammation caused by the neuroma. Orthotics. Custom shoe inserts made by your podiatrist may be useful in controlling foot function. Orthotics may reduce symptoms and prevent the worsening of the condition.
The ultimate success of a Morton?s neuroma treated surgically is somewhat unclear. This is likely due to the idea that in most instances a ?Morton?s neuroma? is actually more than just an isolated nerve problem but rather consitutes a metatarsalgia where other structures (such a as the MTP joints) are also problematic, not just the nerve. Therefore, addressing the nerve as well as the other components of a metatarsalgia may offer a better chance of surgical success. However, like many conditions in foot and ankle, it is ideal if this condition can be managed without surgery.