The subgroups represent a variation within the group and the one illustrated is indicated with red in the text.
A1 Extra-articular fracture, metaphyseal simple
.1 spiral
.2 oblique
.3 transverse
A2 Extra-articular, metaphyseal wedge
.1 postero-lateral impaction
.2 antero-medial wedge
.3 extending into the diaphysis
A3 Extra-articular fracture, metaphyseal complex
.1 three intermediate fragments
.2 more than three intermediate fragments
.3 extending into the diaphysis
B1 Partial articular fracture, pure split
.1 frontal
.2 sagittal
.3 metaphyseal multifragmentary
B2 Partial articular fracture, split-depression
.1 frontal
.2 sagittal
.3 of the central fragment
B3 Partial articular fracture, multifragmentary depression
.1 frontal
.2 sagittal
.3 metaphyseal multifragmentary
C1 Complete articular fracture, articular simple, metaphyseal simple
.1 without depression
.2 with depression
.3 extending into the diaphysis
C2 Complete articular fracture, articular simple, metaphyseal multifragmentary
.1 with asymmetric impaction
.2 without asymmetric impaction
.3 extending into the diaphysis
C3 Complete articular fracture, multifragmentary
.1 epiphyseal
.2 epiphysio-metaphyseal
.3 epiphysio-metaphysio-diaphyseal