Carpal instability

1. What is the role of the lunate in carpal stability?
   A. It connects to the scaphoid and triquetrum.
   B. It forms the primary connection to the radius.
   C. It stabilizes the pisiform bone.
   D. It has no significant role in stability.
   Answer: A
2. Which type of carpal instability involves injury between the scaphoid and lunate?
   A. VISI
   B. CID
   C. DISI
   D. CIND
   Answer: C
3. What is the primary imaging finding in scapholunate dissociation?
   A. Lunotriquetral gap
   B. Scapholunate gap >3mm
   C. Radial deviation
   D. Increased carpal arch
   Answer: B
4. Which ligament injury causes Dorsal Intercalated Segment Instability (DISI)?
   A. Lunotriquetral ligament
   B. Scapholunate ligament
   C. Radial collateral ligament
   D. Pisohamate ligament
   Answer: B
5. What is the normal scapholunate angle?
   A. 0–10°
   B. 30–60°
   C. 70–90°
   D. 90–120°
   Answer: B
6. Which condition is most commonly associated with scapholunate dissociation?
   A. Kienböck’s disease
   B. Osteoarthritis
   C. Rheumatoid arthritis
   D. TFCC tears
   Answer: A
7. What procedure is commonly used for chronic scapholunate dissociation (>6 weeks)?
   A. Closed reduction
   B. Dorsal capsulodesis
   C. Scaphoidectomy
   D. Ulnar nerve decompression
   Answer: B
8. Which of the following is a classic finding on MRI for scapholunate dissociation?
   A. Increased joint fluid
   B. Scapholunate ligament tear
   C. Ulnar variance
   D. Dorsal wrist edema
   Answer: B
9. Which type of instability is defined as abnormal motion within the same row of carpal bones?
   A. Nondissociative instability
   B. Complex instability
   C. Dissociative instability
   D. Adaptive instability
   Answer: C
10. What is the most common clinical presentation in scapholunate dissociation?
    A. Radial wrist pain
    B. Snapping or clicking sensation
    C. Complete wrist dislocation
    D. Loss of wrist extension
    Answer: B

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