Figure 4

The further division of type B fractures (Three-part B-fractures) depends on the additionally occurring tuberosity fractures. a) GBL fractures = incomplete fracture of the anatomical neck with extension into the greater tuberosity (GB) with a fracture of the lesser tuberosity. b) LBG fractures = incomplete fracture of the anatomical neck with extension into the lesser tuberosity (LB) with a fracture of the greater tuberosity. c) MBG fractures = incomplete articular fractures with an medial metaphyseal fragment at the humeral head (MB) with a fracture of the greater tuberosity. d) MBL fractures = incomplete articular fractures with an medial metaphyseal fragment at the humeral head (MB) with a fracture of the lesser tuberosity. e) MBT fractures = 4-Part B fractures appear which are MB fractures in combination with a fracture of both tuberosities (G and L = T) = MBT fractures.