Ulnar Nerve Palsy G56.20 354.2

ulnar nerve sensory innervation


Anatomy of Ulnar Nerve in Guyon's Canal

ICD-9 Classification / Treatment
Etiology / Natural History Associated Injuries / DDx
Anatomy Complications
Clinical Evaluation Follow-up Care
Xray / Diagnositc Tests Review References

synonyms: Ulnar Neuropathy

Ulnar Nerve Palsy ICD-10

Ulnar Nerve Palsy ICD-9

  • 354.2 Lesion of ulnar nerve; cubital tunnel syndrome; tardy ulnar nerve palsy 

Ulnar Nerve Palsy Etiology / Epidemiology / Natural History

  •  Ulnar nerve is most commonly compressed at the elbow(cuitbal tunnel syndrome).  Distal nerve compression is uncommon. 

Ulnar Nerve Palsy Anatomy

  •  Dorsal sensory branch of ulnar N supplies sensation of dorsal ulnar wrist and branches off before wrist.

Ulnar Nerve Palsy Clinical Evaluation

  • Progressive unilateral hand weakness and numbness involving his ring and small fingers.
  • Generally minimal pain if nerve compression is distatl
  • Intrinsic weakness and atrophy, with normal strength of the flexor digitorum profundus and small flexor carpi ulnaris and abductor pollicis brevis muscles.
  • Increased 2-point discrimination to the small finger and ulnar ring finger. 
  • Normal dorsal ulnar hand sensation indicates lesion is distal to cubital tunnel.

Ulnar Nerve Palsy Xray / Diagnositc Tests

  • EMG can show normal conduction of the ulnar nerve across the elbow with denervation of the intrinsics
  • Consider MRI of the wrist and hand to eval for ganglion within Guyon’s canal compressing the ulnar nerve.

Ulnar Nerve Palsy Classification / Treatment

Ulnar Nerve Palsy Associated Injuries / Differential Diagnosis


Ulnar Nerve Palsy Complications

Ulnar Nerve Palsy Follow-up Care


Ulnar Nerve Palsy Review References