Radiculopathy
29 Radiculopathy Radiculopathy is one of the most common diagnoses referred to any electromyography (EMG) laboratory. Even with the widespread use of magnetic resonance imaging, EMG continues to play an…
Electrical Safety and Iatrogenic Complications of Electrodiagnostic Studies
40 Electrical Safety and Iatrogenic Complications of Electrodiagnostic Studies Electrodiagnostic (EDX) studies are generally well tolerated and rarely associated with any significant side effects. Most nerve conduction studies (NCSs) use…
Facial and Trigeminal Neuropathy
25 Facial and Trigeminal Neuropathy Although nerve conduction and electromyography (EMG) studies are used most often to evaluate peripheral nerve and muscle disorders, they also can be used to evaluate…
Basic Electromyography: Analysis of Motor Unit Action Potentials
15 Basic Electromyography Analysis of Motor Unit Action Potentials After assessment of insertional and spontaneous activity, the needle electromyography (EMG) examination moves on to the evaluation of motor unit action…
Routine Lower Extremity Nerve Conduction Techniques
11 Routine Lower Extremity Nerve Conduction Techniques Tibial Motor Study (Figure 11–1) Recording Site: Abductor hallucis brevis (AHB) muscle: G1 placed 1 cm proximal and 1 cm inferior to the navicular prominence…
Basic Nerve Conduction Studies
3 Basic Nerve Conduction Studies After the history is taken and a directed physical examination is performed, every study begins with the nerve conduction studies (NCSs). The needle electromyography (EMG)…
Peroneal Neuropathy
22 Peroneal Neuropathy Peroneal neuropathy is one of the most common mononeuropathies in the lower extremity. Most often, peroneal neuropathy occurs at the fibular neck, where the nerve is quite…
Atypical Motor Neuron Disorders
28 Atypical Motor Neuron Disorders There are a heterogeneous group of motor neuron disorders that are rare but nonetheless important to recognize, because they often can mimic the presentation of…
Ulnar Neuropathy at the Wrist
20 Ulnar Neuropathy at the Wrist Ulnar neuropathy at the wrist (UNW) is a rare condition that sometimes is confused with ulnar neuropathy at the elbow (UNE) or, more often,…
