nissen-lie classification nissen-lie classification nissen-lie classification is a system of categorizing colles' fractures. in the nissen-lie classification system there are seven types of fractures. the classification system was first published in 1939. classification type 1: a fracture at the junction of the shaft and distal extremity of the radius (occurs only in children between the age of 1 and 15 years, and is most commonly a greenstick fracture) type 2: slipping of the epiphysis with dorsal displacement, often with a dorsally avulsed triangular fragment of the radius (occurs in the age range 10-20 years) type 3: minimal displacement type 4: dorsal angulation, extra-articular, no comminution type 5: intra-articular, comminuted type 6: fractures of the radial styloid type 7: fractures with dorsal displacement