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Herbert Classification — Scaphoid

A: acute stable (A1 tubercle, A2 nondisplaced waist). B: acute unstable (B1 distal oblique, B2 displaced waist, B3 proximal pole, B4 comminuted, B5 perilunate). C: delayed union; D: established nonunion. Unstable (B) often need fixation; D needs grafting + fixation.