Ulnar claw Vs Hand of Benediction Flashcards Preview

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

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

Nerve damage


When is Ulnar claw most commonly seen?

Long term lesions of the Ulnar nerve


Which muscles are paralysed in the Ulnar claw?

Medial 2 lumbricals
Hypothenar muscles
Adductor pollicis


What does paralysis of the medial lumbricals cause?

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


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

Because the lateral 2 lumbricals are innervated by the median nerve


What causes Ulnar paradox?

A lesion of the Ulnar nerve at the elbow


In an Ulnar paradox, which extra muscles are paralysed?

Flexor carpi Ulnaris
Medial half of flexor digitorum profundus


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.


What causes hand of Benediction?

Damage to the median nerve


How can you test for hand of Benediction?

Ask the patient to make a fist


Which muscles are paralysed to show a hand of Benediction?

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


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