Peripheral Mononeuropathy - Ulnar Nerve Palsy Flashcards

1
Q

Aetiology of Ulnar Nerve Palsy.

A
  1. Trauma at Medial Epicondyle.
  2. Compression in Cubital Tunnel.
  3. Lacerations to Anterior Wrist (Guyon’s Canal)
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2
Q

Clinical Features of Ulnar Nerve Palsy.

A
  1. Paralysis of Interossei - No Abduction or Adduction of Fingers.
  2. Paralysis/Wasting of Medial 2 Lumbricals and Hypothenar Muscles : Impaired Movement of 4th and 5th Digits.
  3. Impaired Adduction of Thumb : Positive Froment’s Sign (Paralysis of Adductor
    Policies).
  4. Claw Hand - Hyperextension of MCP Joints and Flexion of DIP and PIP of 4th and 5th Joints.
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3
Q

What is Cubital Tunnel Syndrome?

A

Compression of Ulnar Nerve as it passes through Cubital Tunnel.

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4
Q

Clinical Features of Cubital Tunnel Syndrome (3).

A
  1. Tingling + Numbness of 4th and 5th Finger.
  2. Weakness and Muscle Wasting.
  3. Pain Worse on Leaning on Elbow.
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5
Q

What is the Ulnar Paradox?

A

Greater clawing in the hand when there is a lesion at the wrist compared to the elbow - higher lesions cause weakness of flexor digitorum of Flexor Digitorum Profundus.

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