Carpal Pathology
A 28-year-old man presents with chronic radial wrist pain that began after a fall 18 months ago for which he did not seek treatment. Examination reveals snuffbox tenderness and limited wrist motion. Radiographs show a scaphoid waist nonunion with cystic changes, a "humpback" deformity, and early radioscaphoid arthritis. Lateral view demonstrates DISI (dorsal intercalated segment instability) with a scapholunate angle of 75 degrees. Regarding scaphoid nonunion:
Mark each as TRUE or FALSE
Scaphoid nonunion occurs when fracture healing fails to progress after adequate time (typically defi...
Natural history of untreated nonunion is progressive carpal collapse and arthritis (SNAC wrist - Sca...
All scaphoid nonunions heal with prolonged casting; proximal pole fractures have the best blood supp...
DISI (dorsal intercalated segment instability) occurs because the scaphoid normally links the proxim...
Treatment depends on vascularity and deformity: non-vascularized bone graft (Russe, wedge graft) for...
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Click T (True) or F (False) for each option