II. Definition: Categories of Peripheral Nerve Injury

  1. Neuropraxia
    1. Least severe Peripheral Nerve Injury
    2. Myelin fibers surrounding the axon are injured focally
    3. Axon and connective tissue sheath remain unharmed
    4. Limited duration of injury (typically days to weeks)
  2. Axonotmesis
    1. Axon injury
    2. Recovery over months and frequently incomplete nerve regeneration with residual deficit
  3. Neurotmesis
    1. Most severe Peripheral Nerve Injury and least common of the three nerve injury types
    2. Complete axon disruption
    3. Normal regeneration of the nerve is uncommon and signficant persistent deficit is the norm

III. Pathophysiology

  1. Mechanisms of nerve injury
    1. Direct pressure
    2. Repetitive microtrauma
    3. Stretch-induced ischemia
    4. Compression-induced ischemia
  2. Degree of nerve injury factors
    1. Severity of injury Mechanism
    2. Duration of exposure to compression or other Mechanism

V. Causes: Face

VI. Causes: Upper Extremity

  1. Cervical Spine and Cervicobrachial (Axilla)
    1. Cervical Disc Disease
    2. Brachial Plexus Burner
  2. Shoulder
    1. Shoulder Band Syndrome (Reflex Sympathetic Dystrophy)
    2. Quadrilateral Space Syndrome (Axillary Nerve Injury)
    3. Long Thoracic Nerve Injury
      1. Injury: Direct blow to Shoulder or chronic repetitive overhead Shoulder traction (e.g. tennis, swimming, baseball)
      2. Symptoms: Diffuse Shoulder or Neck Pain with overhead activity
      3. Exam: Forward flexion weakness at Shoulder and Scapular winging
    4. Spinal Accessory Nerve Injury
  3. Elbow and Forearm
    1. Cubital Tunnel (Ulnar Nerve)
    2. Radial Tunnel (and related Posterior Interosseus Nerve Syndrome)
  4. Wrist and Hand
    1. See Overuse Syndromes of the Hand and Wrist
    2. Carpal Tunnel Syndrome (Median Nerve)
    3. Ulnar Tunnel Syndrome (Cyclist's Palsy)
    4. Handcuff Neuropathy (Radial Nerve)

VIII. Symptoms

  1. Burning pain
  2. Numbness
  3. Paresthesias
  4. Motor Weakness

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Ontology: Neurapraxia (C0393872)

Concepts Injury or Poisoning (T037)
SnomedCT 390012000, 135894004, 316927003, 367319009, 230619007, 370509002, 370607005
Dutch neuropraxie NAO, neuropraxie
French Neuropraxie SAI, Neuropraxie
German Neuropraxie, Neurapraxie NNB
Italian Neuroaprassia NAS, Neuroprassia
Portuguese Neuropraxia, Nerurapraxia NE
English [Q] Neuropraxia, neuropraxia, neurapraxia, Neurapraxia NOS, [Q] Neuropraxia (qualifier value), Contusion of peripheral nerve, Neuropraxia, Contusion of peripheral nerve (disorder), Neurapraxia (disorder), Neurapraxia (morphologic abnormality), Neurapraxia
Spanish Neuropraxia, Neuropraxia NEOM, [Q] neuropraxia, [Q] neuropraxia (calificador), contusión del nervio periférico (trastorno), contusión del nervio periférico, neuroapraxia (trastorno), neuroapraxia, neuropraxia (anomalía morfológica), neuropraxia
Japanese ニューラプラキシーNOS, ニューラプラキシー, ニューラプラキシー, ニューラプラキシーNOS
Czech Neurapraxie NOS, Neurapraxie, snížení funkce periferního nervu
Hungarian Neuropraxia, Neurapraxia k.m.n.