Russell-taylor classification of subtrochanteric femural fractures which is based on the integrity of lesser trochanter and extension of fracture into piriformis fossa…
#Type 1, fracture not extend into piriformis fossa
1A lesser trochanter is intact .
1B lesser trochanter is not intact .
#Type II , fracture extend into piriformis fossa.
IIA lesser trochanter is intact
IIB lesser trochanter is not intact.