Scaphoid fractures usually occur as an isolated fracture (1) but may be
part of a larger injury complex (2). Oblique (3), comminuted (4) and
proximal (9) fracture lines are prone to nonunion. Nonunion may be
radiographically subtle (5), cystic (6) or hypertrophic (7). The
majority of scaphoid nonunions progress to a pattern of radioscaphoid
and midcarpal arthritis referred to as Scaphoid Nonunion Advanced
Collapse or "SNAC wrist" (8, 9).