Meralgia paresthetica, also called lateral femoral cutaneous nerve syndrome or Bernhardt-Roth syndrome is a condition in which one of the large sensory nerve that innervates the outer portion of the thigh gets compressed or entrapped.
This occurs when the lateral femoral cutaneous nerve gets "entrapped" as it passes through the inguinal ligament.
This abnormal pressure on the nerve results in tingling, numbness, and burning pain in the region where it supplies sensation – the outer and part of the front of the thigh.
The conditions that cause increased pressure on the groin area, usually enlarged bellies such as in obesity or pregnancy or wearing tight-fitted clothes are the common reason for the development of meralgia paresthetica.
Sometimes, meralgia paresthetica can also be a result of local trauma or a disease such as diabetes.
Most cases of meralgia paresthetica can be managed with conservative measures, such as wearing loose fitting clothing.
In severe conditions, the treatment that may include medications to relieve your discomfort or, rarely, surgery may be needed.
The pressure on the lateral femoral cutaneous nerve, which supplies sensation to your upper thigh, may cause these symptoms of meralgia paresthetica:
Burning pain on the outer part of your thigh, sometimes extending to the lateral side of your knee.
Tingling sensation or a feeling of numbness on the outer (lateral) part of your thigh.
Aching pain in the groin area or pain that spreads across the buttocks.
These symptoms usually are seen on only one side of your body and may aggravate after walking or standing for a long period.
Consult your doctor if you have pain or any other symptoms of meralgia paresthetica.
Meralgia paresthetica is caused by focal entrapment of the lateral femoral cutaneous nerve that supplies sensation to the surface of your outer thigh.
This nerve may become compressed, or "pinched". The lateral femoral cutaneous nerve is completely a sensory nerve and does not affect your movements or the ability to use your leg muscles.
Normally, this nerve passes through the groin area to the upper thigh without any trouble, but, in meralgia paresthetica, the lateral femoral cutaneous nerve gets trapped — often below the inguinal ligament that runs along your groin from your abdomen to your upper thigh.
The common causes of this compression include any conditions that exert increased pressure on the groin area, including:
Wearing tight fitting clothing such as belts, corsets, and tight pants.
If your pain bothers you much, over-the-counter (OTC) pain relievers such as acetaminophen (Tylenol, others), ibuprofen (Advil, Motrin IB, others) or aspirin may be taken. Also, avoid wearing tight fitting clothes.
Your doctor may touch the affected leg, ask you to describe your pain, and trace out the specific location of the numb or painful area on your leg.
To preclude other possible conditions, your doctor may recommend:
X-ray imaging: This diagnostic tool uses radiation to make images of your hip and pelvic area.
Electromyography: This test measures the electrical discharges produced in the muscles to evaluate and diagnose muscle and nerve disorders. During this test, a thin needle electrode, which records electrical activity is placed into the muscle. The results of this test will be normal in meralgia paresthetica, but the test may be done to exclude other disorders when the diagnosis is not clear.
Nerve conduction study: In this test, patch-style electrodes attached to your skin releases mild electrical impulses to stimulate the nerve. These electrical impulses help in diagnosis of damaged nerves.
Diagnostic nerve blockade: If pain relief is achieved from an injection of anesthesia into the region on your thigh where the lateral femoral cutaneous nerve enters, it can be confirmed that you have meralgia paresthetica. Ultrasound imaging is used to guide the needle.
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