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Claw Hand Conditions and Mechanisms

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Questions and Answers

What is one major consequence of the intrinsic muscle action loss in claw hand?

Hyperextension of the metacarpophalangeal (MCP) joint (correct)

Hyperextension of the distal interphalangeal (DIP) joints

Flexion of the metacarpophalangeal (MCP) joints

Hyperflexion of the interphalangeal joints

Which muscle's unopposed action leads to hyperextension of the MCP joint in claw hand?

Flexor digitorum profundus (FDP)

Hypothenar muscles

Flexor digitorum superficialis (FDS)

Extensor digitorum communis (EDC) (correct)

What is the primary cause of claw hand?

Median nerve injury

Proximal radial nerve injury

Distal ulnar nerve injury or chronic compression (correct)

Distal radial nerve injury

How does the action of the flexor digitorum profundus (FDP) and flexor digitorum superficialis (FDS) muscles contribute to claw hand?

<p>They cause unopposed flexion of the interphalangeal joints (A)</p> Signup and view all the answers

Which joint movements are predominantly affected by claw hand due to the loss of intrinsic muscle action?

<p>Flexion and extension of the interphalangeal joints (C)</p> Signup and view all the answers

Study Notes

Claw Hand

Claw hand is caused by distal ulnar nerve injury or chronic compression.
This results in the loss of intrinsic muscle action.
Loss of intrinsic muscle action leads to loss of isolated MCP flexion.
Consequently, there's hyperextension due to unopposed action of the EDC (extensor digitorum communis).
Moreover, unopposed flexion of PIP (proximal interphalangeal) and DIP (distal interphalangeal) joints occurs due to strong FDP (flexor digitorum profundus) and FDS (flexor digitorum superficialis) action.

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Description

This quiz explores the mechanisms and causes of claw hand, primarily focusing on distal ulnar nerve injury and chronic compression. Understand the implications of intrinsic muscle action loss and how it affects joint movements. Test your knowledge on related anatomical structures and their functions.