System used to describe scaphoid fractures; types B5 and C are now obsolete. Type A1, nondisplaced hairline fracture of tubercle; type A2, nondisplaced hairline fracture of waist; type B1, oblique fracture in distal third; type B2, displaced fracture of middle waist; type B3, proximal pole fracture; type B4, carpal dislocation and fracture; type D1, fibrous union; type D2, pseudoarthrosis; type D3, sclerotic pseudoarthrosis; type D4, avascular necrosis.