The subgroups represent a variation within the group and the one illustrated is indicated with red in the text.
A1
Trochanteric area fracture, pertrochanteric simple
.1 along the inertrochanteric line
.2 through the greater trochanter
.3 below the lesser trochanter
A2 Trochanteric area fracture, pertrochanteric
multifragmentary
.1 with one interfmediate fragment
.2 with several intermediate fragments
.3 extending more than 1 cm below the lesser trochanter
A3 Trochanteric area fracture, intertrochanteric
.1 simple, oblique
.2 simple, transverse
.3 multifragmentary
B1 Neck fracture, subcapital, with slight displacement
.1 impacted in valgus > or = 15°
.2 impacted in valgus < 15°
.3 non impacted
B2 Neck fracture, transcervical
.1 basicervical
.2 midcervical adduction
.3 midcervical shear
B3 Neck fracture, subcapital, non
impacted, displaced
.1 moderate displacement in varus and external rotation
.2 moderate displacement with vertical translation and external rotation
.3 marked displacement
C1 Head fracture, split
.1 avulsion of the ligamentum teres
.2 with rupture of the ligmentum teres
.3 large fragment
C2 Head fracture, with depression
.1 posterior and superior
.2 anterior and superior
.3 split-depression
C3 Head fracture, with neck fracture
.1 split and transcervical neck fracture
.2 split and subcapital neck fracture
.3 depression and neck fracture