Posterior interosseous neuropathy

Revision as of 14:35, 2 August 2020 by Fredvarone (talk | contribs) (Background)


  • Posterior interosseous nerve (C7-8) is a branch of the radial nerve that supplies motor innervation to the forearm extensor muscles
  • Compression or injury can cause an isolated PIN palsy [1]
  • More proximal pathologies can cause a combined palsy
  • More common in body builders and laborers due to repetitive pronosupination

Clinical Features

  • Forearm and wrist pain
  • Weakness on finger and wrist extension

Differential Diagnosis

  • Peripheral neuropathy
    • Repetitive microtrauma
    • Entrapment
    • Trauma
    • Space occupying lesions
      • Ganglion cyst
      • Lipoma
      • Bone tumor
  • Iatrogenic

Upper extremity peripheral nerve syndromes

Median Nerve Syndromes

Ulnar Nerve Syndromes

Radial Nerve Syndromes

Proximal Neuropathies



  • Usually a clinical diagnosis
  • EMG


  • Nonoperative: rest, activity modification, NSAIDs, splinting
  • Operative decompression: compressive masses


  • Discharge with orthopedic follow up

See Also

External Links


  1. Dang AC et al. Unusual Compression Neuropathies of the Forearm, Part I: Radial Nerve. JHS. 2009;34A:1906-1914.