The subgroups represent a variation within the group and the one illustrated is indicated with red in the text.
A1 Extra-articular fracture, apophyseal avulsion
.1 lateral epicondyle
.2 medial epicondyle, non incarcerated
.3 medial epicondyle, incarcerated
A2 Extra-articular fracture, metaphyseal simple
.1 oblique downwards and inwards
.2 oblique downwards and outwards
.3 transverse
A3 Extra-articular fracture, metaphyseal multifragmentary
.1 with an intact wedge
.2 with a fragmented wedge
.3 complex
B1 Partial articular fracture, lateral sagittal
.1 capitellum
.2 transtrochlear simple
.3 transtrochlear multifragmentary
B2 Partial articular fracture, medial sagittal
.1 transtrochlear simple, through the medial side (Milch I)
.2 transtrochlear simple, through the groove
.3 transtrochlear multifragmentary
B3 Partial articular fracture, frontal
.1 capitellum
.2 trochlea
.3 capitellum and trochlea
C1 Complete articular fracture, articular simple, metaphyseal simple
.1 with slight displacement
.2 with marked displacement
.3 T-shaped epiphyseal
C2 Complete articular fracture, articular simple, metaphyseal multifragmentary
.1 with an intact wedge
.2 with a fragmented wedge
.3 complex
C3 Complete articular fracture, multifragmentary
.1 metaphyseal simple
.2 metaphyseal wedge
.3 metaphyseal complex