Advanced Wrist Joint Quiz

Q1. Which ligament is most directly associated with maintaining the relationship between the scaphoid and lunate?

• Scapholunate interosseous ligament
• Ulnar collateral ligament of the elbow
• Coracoclavicular ligament
• Annular ligament

Q2. Disruption of the scapholunate interosseous ligament can lead to which general consequence?

• Ulnar nerve entrapment at the elbow
• Scapholunate instability
• Acromioclavicular separation
• Radial head dislocation

Q3. Which carpal bone is most commonly fractured?

• Trapezoid
• Capitate
• Pisiform
• Scaphoid

Q4. Why can a fracture through the waist of the scaphoid place its proximal fragment at risk of avascular necrosis?

• Much of its blood supply enters distally and travels toward the proximal pole
• Its blood supply comes exclusively from the ulnar artery through the pisiform
• The proximal scaphoid normally has no blood supply
• The scaphoid receives blood only from the median nerve

Q5. Which structure is a major stabilizer of the ulnar side of the wrist and the distal radioulnar joint?

• Scapular labrum
• Triangular fibrocartilage complex
• Flexor retinaculum alone
• Annular ligament

Q6. Why does the ulna normally not articulate directly with the proximal carpal row?

• The pisiform is fused directly to the ulna
• The radius completely surrounds the distal ulna
• The ulna ends at the elbow
• An articular disc separates the ulna from the carpal bones

Q7. A Colles fracture typically involves which bone near the wrist?

• Distal ulna only
• First metacarpal
• Distal radius
• Scaphoid only

Q8. A Smith fracture differs classically from a Colles fracture because the distal radial fragment is displaced in which direction?

• Dorsal
• Volar
• Directly lateral only
• Proximal only

Q9. Which nerve is particularly at risk from increased pressure within the carpal tunnel at the wrist?

• Median nerve
• Musculocutaneous nerve
• Radial nerve
• Axillary nerve

Q10. Which description best summarizes the functional anatomy of the wrist joint complex?

• Coordinated carpal articulations and soft tissue stabilizers provide mobility while maintaining alignment
• The wrist is a simple hinge stabilized only by the flexor retinaculum
• All wrist movement occurs only between the radius and scaphoid
• The ulna directly bears all forces transmitted from the carpal bones