II. Pathophysiology

  1. Radial Nerve tracks follows the spiral groove down the medial Humerus

III. Causes

  1. Mid-shaft Humerus Fracture
    1. Direct injury to the Radial Nerve as it lies in spiral groove
    2. Does not typically affect elbow extension (triceps)
  2. Axilla compression (Saturday Night Palsy, Crutch Palsy)
    1. Falling asleep with arm over the back of a chair or bench, often inebriated (Saturday Night Palsy)
    2. Results in loss of elbow extension (triceps) and a Wrist Drop
  3. Honeymooner's Wrist Drop
    1. Shoulder and upper arm compressed under the arm/body of their partner resulting in local compression

IV. Signs

  1. Weak elbow extension
    1. Occurs if Radial Nerve injury at the axilla
  2. Wrist Drop
    1. Weak wrist and digit extensors
  3. Sensory loss
    1. Dorsal hand numbness (including lateral 3.5 digits)

V. Management

  1. Avoid repeat compression
  2. Physical Therapy
    1. Highly effective after 6 months
  3. Cock-Up Wrist Splint
    1. Maintains normal hand function when Wrist Drop present
  4. Surgery indications
    1. Humerus Fracture with Radial Nerve compromise

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Related Studies

Ontology: Saturday Night Palsy (C0270796)

Concepts Disease or Syndrome (T047)
MSH D020425
SnomedCT 14786003
Czech obrna sobotní noci
Portuguese Paralisia de Sábado à Noite
Spanish Parálisis de Sábado por la Noche, parálisis de la noche del sábado (trastorno), parálisis de la noche del sábado
French Paralysie du samedi soir, Paralysie des amoureux
German Parkbanklähmung
English Saturday night palsy (diagnosis), Saturday Night Palsies, saturday night palsy, Saturday night paralysis, Saturday night palsy, Saturday night paralysis (disorder), Saturday Night Palsy
Norwegian Lørdagskveldslammelse
Italian Paralisi del sabato sera
Dutch Zaterdagavondverlamming

Ontology: Radial nerve compression (C0393888)

Concepts Injury or Poisoning (T037)
SnomedCT 230634001
English radial nerve compression, compression nerve radial, Radial nerve compression, Radial nerve compression (disorder)
Czech Komprese nervus radialis
Dutch spaakbeenspier compressie
French Compression du nerf radial
German Kompression des Nervus radialis
Hungarian Nervus radialis compressio
Italian Compressione del nervo radiale
Spanish Compresión del nervio radial, compresión del nervio radial (trastorno), compresión del nervio radial
Japanese トウコツシンケイアッパク, 橈骨神経圧迫
Portuguese Compressão do nervo radial

Ontology: Radial Neuropathy (C0748226)

Definition (MSH) Disease involving the RADIAL NERVE. Clinical features include weakness of elbow extension, elbow flexion, supination of the forearm, wrist and finger extension, and thumb abduction. Sensation may be impaired over regions of the dorsal forearm. Common sites of compression or traumatic injury include the AXILLA and radial groove of the HUMERUS.
Concepts Disease or Syndrome (T047)
MSH D020425
SnomedCT 16644004
English Radial Neuropathy, RADIAL NERVE DIS, Nerve Disease, Radial, Nerve Diseases, Radial, Radial Nerve Disease, Radial Nerve Diseases, Neuropathies, Radial, Neuropathy, Radial, Radial Neuropathies, Radial Neuropathy [Disease/Finding], Radial neuropathy (finding), Radial neuropathy (disorder), Radial neuropathy
Swedish Radialisneuropati
Czech nervus radialis - neuropatie
Finnish Värttinähermon neuropatia
German Nervus radialis-Krankheiten, Nervus-radialis-Neuropathie, Neuropathie, Nervus radialis
Japanese 松葉づえ麻痺, 橈骨神経麻痺, 土曜夜麻痺, 筋ラセン神経麻痺, 橈骨神経障害
Spanish neuropatía radial (hallazgo), neuropatía radial (trastorno), neuropatía radial, Neuropatía Radial
Polish Porażenie sobotniej nocy, Neuropatia nerwu promieniowego, Neuropatia promieniowa
Norwegian Sykdommer i nervus radialis, Radialisnevropati
French Neuropathie du nerf radial, Atteinte du nerf radial
Italian Neuropatia del nervo radiale
Dutch Nervus-radialisneuropathie, Neuropathie, nervus-radialis-
Portuguese Neuropatia Radial

Ontology: Radial nerve palsy (C1306600)

Concepts Disease or Syndrome (T047)
SnomedCT 16644004
English RADIAL NERVE PALSY, Radial nerve palsy, radial nerve palsy (diagnosis), nerve palsy radial, radial nerve palsy
Italian Paralisi del nervo radiale
Japanese 橈骨神経麻痺, トウコツシンケイマヒ
German LAEHMUNG NERVUS RADIALIS, Radialislaehmung
Portuguese PARALISIA DO NERVO RADIAL, Paralisia do nervo radial
Spanish PARALISIS NERVIO RADIAL, Parálisis del nervio radial
French PARALYSIE DU NERF RADIAL, Paralysie du nerf radial
Czech Obrna nervus radialis
Hungarian Nervus radialis paresis
Dutch radiale zenuwverlamming