lOMoAR cPSD| 63316909
NR511 – Week 7 Quiz
Correct answer: A. Scaphoid fracture Step-by-step
explanation:
• Mechanism: A slip-and-fall commonly causes a fall on an outstretched hand (FOOSH), the classic mechanism for scaphoid
injury.
• Key exam finding: Point tenderness in the anatomical snuffbox (bounded by the tendons of the extensor pollicis longus and
brevis) is highly suggestive of a scaphoid fracture.
• Why not the others:
• Hamate fracture: Usually from an impact with a bat/club; tenderness over the hypothenar eminence, not the snuffbox.
• Ulnar styloid fracture: Pain localizes to the ulnar side of the wrist.
• Radial head fracture: Causes elbow pain after FOOSH, not wrist/snuffbox tenderness.
• Clinical note: Initial radiographs can be negative. Immobilize with a thumb-spica splint and obtain repeat X-rays or advanced
imaging to prevent complications such as avascular necrosis due to the scaphoid’s retrograde blood supply.
Correct answer: D. Median nerve Step-by-step
explanation:
• Carpal tunnel is the fibro-osseous canal at the wrist containing the median nerve and flexor tendons.
• Carpal tunnel syndrome results from increased pressure within this tunnel (often due to inflammation of tendon
sheaths/synovium), which compresses the median nerve.
• Clinical signs: paresthesias in the lateral 3½ digits, thenar weakness/atrophy, positive Tinel and Phalen tests.
• Other nerves listed:
• Radial nerve: affects dorsum of hand/thumb extension, not typical for carpal tunnel.
• Ulnar nerve: causes problems in the medial 1½ digits (Guyon’s canal), not carpal tunnel.
• “Brachial nerve” is not a specific peripheral nerve.
, lOMoAR cPSD| 63316909
Correct answer: B. Supination Step-by-step
explanation:
• Supination is the rotation of the forearm so that the palm faces up (anteriorly in anatomical position).
• Pronation is the opposite motion—rotating the forearm so the palm faces down.
• Abduction is movement away from the midline (not a forearm rotation).
• Eversion is turning the sole of the foot outward (ankle movement), not the forearm.
Correct answer: B. Salter-Harris III fracture Step-by-step
explanation:
• Salter-Harris classification describes physeal (growth plate) injuries.
• Type III: fracture line extends through the epiphysis and the physis into the articular surface.
• The vignette specifies a distal tibia fracture “over the articular surface, through the epiphysis and physis,” which matches Type III.
• Type II involves metaphysis + physis; Type IV involves metaphysis + physis + epiphysis; Type V is a crush of the physis.
NR511 – Week 7 Quiz
Correct answer: A. Scaphoid fracture Step-by-step
explanation:
• Mechanism: A slip-and-fall commonly causes a fall on an outstretched hand (FOOSH), the classic mechanism for scaphoid
injury.
• Key exam finding: Point tenderness in the anatomical snuffbox (bounded by the tendons of the extensor pollicis longus and
brevis) is highly suggestive of a scaphoid fracture.
• Why not the others:
• Hamate fracture: Usually from an impact with a bat/club; tenderness over the hypothenar eminence, not the snuffbox.
• Ulnar styloid fracture: Pain localizes to the ulnar side of the wrist.
• Radial head fracture: Causes elbow pain after FOOSH, not wrist/snuffbox tenderness.
• Clinical note: Initial radiographs can be negative. Immobilize with a thumb-spica splint and obtain repeat X-rays or advanced
imaging to prevent complications such as avascular necrosis due to the scaphoid’s retrograde blood supply.
Correct answer: D. Median nerve Step-by-step
explanation:
• Carpal tunnel is the fibro-osseous canal at the wrist containing the median nerve and flexor tendons.
• Carpal tunnel syndrome results from increased pressure within this tunnel (often due to inflammation of tendon
sheaths/synovium), which compresses the median nerve.
• Clinical signs: paresthesias in the lateral 3½ digits, thenar weakness/atrophy, positive Tinel and Phalen tests.
• Other nerves listed:
• Radial nerve: affects dorsum of hand/thumb extension, not typical for carpal tunnel.
• Ulnar nerve: causes problems in the medial 1½ digits (Guyon’s canal), not carpal tunnel.
• “Brachial nerve” is not a specific peripheral nerve.
, lOMoAR cPSD| 63316909
Correct answer: B. Supination Step-by-step
explanation:
• Supination is the rotation of the forearm so that the palm faces up (anteriorly in anatomical position).
• Pronation is the opposite motion—rotating the forearm so the palm faces down.
• Abduction is movement away from the midline (not a forearm rotation).
• Eversion is turning the sole of the foot outward (ankle movement), not the forearm.
Correct answer: B. Salter-Harris III fracture Step-by-step
explanation:
• Salter-Harris classification describes physeal (growth plate) injuries.
• Type III: fracture line extends through the epiphysis and the physis into the articular surface.
• The vignette specifies a distal tibia fracture “over the articular surface, through the epiphysis and physis,” which matches Type III.
• Type II involves metaphysis + physis; Type IV involves metaphysis + physis + epiphysis; Type V is a crush of the physis.
