Ulnar claw Vs Hand of Benediction Flashcards Preview

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Flashcards in Ulnar claw Vs Hand of Benediction Deck (12):
1

What are both Ulnar claw and Hand of Benediction a sign of?

Nerve damage

2

When is Ulnar claw most commonly seen?

Long term lesions of the Ulnar nerve

3

Which muscles are paralysed in the Ulnar claw?

Medial 2 lumbricals
Interossei
Hypothenar muscles
Adductor pollicis

4

What does paralysis of the medial lumbricals cause?

Loss of flexion at the metacarpal-phalangeal joint
Loss of extension at the interphalangeal joint

5

Why does the Ulnar claw only involve the medial 2 lumbricals?

Because the lateral 2 lumbricals are innervated by the median nerve

6

What causes Ulnar paradox?

A lesion of the Ulnar nerve at the elbow

7

In an Ulnar paradox, which extra muscles are paralysed?

Flexor carpi Ulnaris
Medial half of flexor digitorum profundus

8

What does an Ulnar paradox look like?

Hyperextention of the metacarpal-phalangeal joints. There is no flexion of the interphalangeal joint due to the denervation of the medial half of flexor digitorum profundus.

9

What causes hand of Benediction?

Damage to the median nerve

10

How can you test for hand of Benediction?

Ask the patient to make a fist

11

Which muscles are paralysed to show a hand of Benediction?

All flexors in the anterior compartment of the arm
Lateral 2 lumbricals

12

What does hand of Benediction look like?

Patient is asked to make a fist, ring and little finger can flex but the index and middle finger cannot flex at the metacarpal-phalangeal joint or interphalangeal joint