Questions and Answers
What does the term 'Scaphoid' refer to?
What does the term 'Pisiform' refer to?
What type of projection is described as 'Tangential Inferosuperior'?
Projection
What is the CR Angulation for the carpal canal view?
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Where is the CR located for the carpal canal view?
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What is the part position required for the carpal canal view?
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What structure is best shown in the carpal canal view?
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Study Notes
Carpal Canal (Gaynor-Hart Method) Overview
- Involves imaging the carpal canal, a passageway for nerves and tendons in the wrist.
- Key for diagnosing conditions affecting the carpal region, such as carpal tunnel syndrome.
Essential Carpal Bones
- Scaphoid: Boat-shaped bone; commonly fractured, affecting wrist function.
- Pisiform: Pea-shaped bone, a sesamoid bone that sits in the tendon of the flexor carpi ulnaris.
- Trapezium: Connects with the first metacarpal, enabling thumb opposition.
- Trapezoid: The second smallest carpal bone, located between trapezium and capitate.
- Capitate: Largest carpal bone, central to wrist movement and stability.
- Hamate: Characterized by its hook-like projection, important for grip.
- Hamulus: The hook of the hamate bone that provides attachment for ligaments.
Imaging Technique
- Projection: Utilizes a tangential inferosuperior method, providing a unique view of the carpal region.
- CR Angulation: Requires an angle of 25-30 degrees directed toward the patient's hand for accurate imaging.
- Centering Point: Central ray (CR) should be positioned 1 inch distal to the base of the third metacarpal for optimal capture.
- Part Position: Involves hyperextension of the wrist and a slight internal rotation (approximately 10 degrees) for correct alignment.
Structures Visualized
- The technique effectively highlights the anatomy of the carpal bones, allowing for detailed assessment and diagnosis of potential issues.
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Description
Test your knowledge of the carpal canal anatomy using the Gaynor-Hart method. This quiz covers key carpal bones and their definitions. Perfect for anatomy students and healthcare professionals who want to refresh their understanding of wrist structure.
