Fig. (2) Four patterns of comminuted posterior cortex in pertrochanteric fractures. All three-dimensional reconstructed images were observed in the posteroanterior direction.A) A third fragment consisting of the lesser trochanter.B) A third fragment consisting of the relatively larger greater trochanter.C) A third fragment consisting of the greater trochanter and lesser trochanter en bloc.D) A third fragment consisting of the greater trochanter and lesser trochanter separately.