Isolated single trochanter fractures

Isolated single fractures of the greater and lesser trochanter are classified by AO/OTA as 31A1.1(n) and 31A1.1(o), respectively.

These isolated fractures are very rare, especially the avulsion fracture of the lesser trochanter. They more often happen as an avulsion fracture in the adolescent patient.

The abductor muscle insertion may pull the greater trochanter fragment proximally. If this is not reduced and fixed, the abductor muscle will be shortened and its function impaired.

An apparently isolated, displaced fracture of the greater trochanter may include a nondisplaced or incomplete pertrochanteric component.

Consider MRI to confirm the correct diagnosis.