Podcast
Questions and Answers
What is one major consequence of the intrinsic muscle action loss in claw hand?
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?
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?
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?
How does the action of the flexor digitorum profundus (FDP) and flexor digitorum superficialis (FDS) muscles contribute to claw hand?
Which joint movements are predominantly affected by claw hand due to the loss of intrinsic muscle action?
Which joint movements are predominantly affected by claw hand due to the loss of intrinsic muscle action?
Flashcards
Claw Hand
Claw Hand
A condition caused by distal ulnar nerve injury leading to joint deformities.
Distal Ulnar Nerve Injury
Distal Ulnar Nerve Injury
Injury affecting the ulnar nerve's function, leading to muscle action loss.
Hyperextension of MCP Joint
Hyperextension of MCP Joint
MCP joints become hyperextended due to loss of flexor muscle action.
Extensor Digitorum Communis (EDC)
Extensor Digitorum Communis (EDC)
Signup and view all the flashcards
Flexor Digitorum Profundus (FDP) and Flexor Digitorum Superficialis (FDS)
Flexor Digitorum Profundus (FDP) and Flexor Digitorum Superficialis (FDS)
Signup and view all the flashcards
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.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
