For Professionals

The primary goal of electrodiagnostic examination is to determine the site of the lesion. Such testing serves a variety of functions:

  • To establish the diagnosis
  • To evaluate for concomitant conditions
  • To argue for or against an alternative diagnosis
  • To quantify the severity of the condition

By establishing the correct diagnosis it can help select the best therapeutic option. Although clinical evaluation is irreplaceable, electromyography can help in providing in-depth information about the state of the peripheral myelin, axons or muscles. This site is not meant as a substitute to many available textbooks about the neuromuscular disorders, instead its goal is to provide practical information about variety of conditions in which contemporary electromyography can assist clinicians. To obtain additional information please click on the link below.

Disorders

Amyotrophic Lateral Sclerosis
Anterior Interosseous Syndrome
Arthrogryposis Multiplex
Axillary neuropathy
Botulism
Brachial plexopathy
Carpal Tunnel Syndrome
Cervical radiculopathy
Chronic Immune Demyelinating Polyneuropathy
Cubital Tunnel Syndrome
Dermatomyosits
Dorsal Scapular neuropathy
Entrapment syndromes
Facio-scapulo-peroneal SMA
Fazio-Lande SMA
Femoral neuropathy
GBS
Gluteal neuropathy
Guillain-Barre Syndrome
Guyon’s canal entrapment

Handcuff neuropathy
Inclusion Body Myositis
Infantile SMA
Juvenile bulbar SMA
Juvenile SMA
Kugelberg-Wellander SMA
Lambert-Eaton Syndrome
Lateral Femoral Cutaneous neuropathy
Median neuropathy
MGUS polyneuropathy
MMN
Mononeuropathy
Multifocal Motor Neuropathy with Conduction Blocks
Muscular Dystrophy
Musculocutaneous neuropathy
Myasthenia Gravis
Myopathy
Neuropathy
Obturator neuropathy
Pelvic girdle neuropathy

Peroneal neuropathy
Plantar neuropathy
Plexopathy
Polymyositis
Polyneuropathy
Posterior Interosseous Syndrome
Pronator Teres Syndrome
Radial neuropathy
Radiculopathy
Scapulo-peroneal SMA
Sciatic neuropathy
Shoulder girdle mononeuropathy
SMA
Spinal Muscular Atrophy
Stiff Person Syndrome
Suprascapular neuropathy
Tarsal Tunnel Syndrome
Tibial neuropathy
Ulnar neuropathy
Ulnar palmar branch neuropathy
Werding-Hoffman SMA

Amyotrophic Lateral Sclerosis
Anterior Interosseous Syndrome
Arthrogryposis Multiplex
Axillary neuropathy
Botulism
Brachial plexopathy
Carpal Tunnel
Syndrome
Cervical radiculopathy
Chronic Immune Demyelinating Polyneuropathy
Cubital Tunnel Syndrome

Dermatomyosits
Dorsal Scapular neuropathy
Entrapment syndromes
Facio-scapulo-peroneal SMA
Fazio-Lande SMA
Femoral neuropathy
GBS
Gluteal neuropathy
Guillain-Barre Syndrome
Guyon’s canal entrapment

Handcuff neuropathy
Inclusion Body Myositis
Infantile SMA
Juvenile bulbar SMA
Juvenile SMA
Kugelberg-Wellander SMA
Lambert-Eaton Syndrome
Lateral Femoral Cutaneous neuropathy
Median neuropathy
MGUS polyneuropathy

MMN
Mononeuropathy
Multifocal Motor Neuropathy with Conduction Blocks
Muscular Dystrophy
Musculocutaneous neuropathy
Myasthenia Gravis
Myopathy
Neuropathy
Obturator neuropathy
Pelvic girdle neuropathy

Peroneal neuropathy
Plantar neuropathy
Plexopathy
Polymyositis
Polyneuropathy
Posterior Interosseous Syndrome
Pronator Teres Syndrome
Radial neuropathy
Radiculopathy
Scapulo-peroneal SMA

Sciatic neuropathy
Shoulder girdle mononeuropathy
SMA
Spinal Muscular Atrophy
Stiff Person Syndrome
Suprascapular neuropathy
Tarsal Tunnel Syndrome
Tibial neuropathy
Ulnar neuropathy
Ulnar palmar branch neuropathy
Werding-Hoffman SMA

CONTACT US
LOCATIONS

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Illustration Attributions

LAWRENCE:
EMG LABORATORY
25 MARSTON STREET #208
LAWRENCE, MA 01841

TEL: 978-687-2586

FAX: 978-687-8268

HYANNIS:
EMG LABORATORY
51 MAIN STREET #6
HYANNIS, MA 02601
TEL: 508-775-2600
FAX: 508-775-1437

Medical illustrations on this website are attributed to: Freepik.com and author Kjpargeter

Lateral Femoral Cutaneous Nerve

From: www.wheelessonline.com 

– Anatomy:    

– LFCN, as its name suggests, is purely sensory;    
– it arises from L2 and L3, travels downward lateral to the psoas muscle, crosses the iliacus muscle (deep to fascia), passes either thru or underneath the lateral aspect of the inguinal ligament, and finally travels onto innervate the lateral thigh;
– it divides into anterior and posterior branches and supplies skin on lateral aspect of thigh;
– in the study by Hospodar et al (JTO 1999), the course of the nerve was variable, but was most commonly found at 10-15 mm from the ASIS and as far medially as 46 mm from the ASIS;
– in no specimen did the nerve pass lateral to the ASIS (eventhough historically the nerve is thought to pass lateral to the ASIS in 10% of population);
– in all specimens the nerve passed underneath the ilioginal ligament and anterior to the iliacus muscle; 

– Meralgia Paresthetica: 

– entrapment syndrome of the lateral femoral cutaneous nerve causing burning, numbness, and paresthesias down the proximal-lateral aspect of the thigh;
– may be idiopathic, be a result of trauma, previous operations, and in some cases may arise from Perthes Disease abduction splints;
– in idiopathic cases, the nerve may be encased in bone by the growing apophysis of the anterior superior iliac spine, or may be entrapped in fascia either proximal or distal to the ASIS;    
– diagnosis is made by:           
– reproduction of the pain by deep palpation just below the anterior superior iliac spine and by hip extension;           
– relief of pain by localized injection of lidocaine;    
– treatment: when diagnosis is not in doubt and the symptoms are severe, consider operative decompression at the site of constriction;

EMG and NCS

Electromyography (EMG) and nerve conduction studies (NCS) are tests that measure the electrical activity of muscles and nerves. Nerves send out electrical signals to make your muscles react in certain ways. Nerves also send signals from your skin to your brain, which then processes the signals, so you can experience a variety of skin sensations.

  • An EMG Test looks at the electrical signals your muscles make when they are at rest and when they are being used.
  • A Nerve Conduction Study measures how fast and how well the body’s electrical signals travel along your nerves. EMG and nerve conduction studies are used to help diagnose a variety of muscle and nerve disorders and to quantify the severity of your condition.


An EMG test helps find out if muscles are responding the right way to nerve signals. Nerve conduction studies help diagnose nerve damage or disease. When EMG tests and nerve conduction studies are done together, they help doctors tell if your symptoms are caused by a muscle disorder or a nerve problem. With EMG and NCS studies, your doctor can next select the best therapeutic option to help you.