Subtrochanteric femur fractures, located from the lesser trochanter to 5 cm distal, typically deform into varus and procurvatum (flexion) after antegrade nailing. This occurs because hip abductors and the iliopsoas pull the proximal fragment into abduction and flexion, while adductors pull the distal fragment inward. Fractures extending into the intertrochanteric area may be called peritrochanteric fractures.
Subtrochanteric femur fractures deformity after antegrade nailing is varus and procurvatum (or flexion).
This is caused by the hip abductors (gluteus medius and gluteus minimus muscles), iliopsoas muscle and short external rotator muscles pulling the proximal fragment into abduction, flexion and external rotation respectively. While the distal fragment is pulled into adduction by the adductor muscles.
- Subtrochanteric region typically defined as area from lesser trochanter to 5 cm distal.
- Fractures with an associated intertrochanteric component may be called
- Intertrochanteric fracture with subtrochanteric extension
- Peritrochanteric fracture
