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The AO classification for femoral intertrochanteric fractures. The A1 fracture routinely is considered a simple, stable intertrochanteric femur fracture. The A2 fracture is characterized by a similar fracture pattern with an unstable medial bot-tress. The A3 fracture has a fracture line distal to the vastus ridge, and is therefore “unstable”. AO, Arbeitsgemeinschaft für Osteosynthesefragen.
