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The AO/OTA classification of the extra-capsular proximal femur fractures (intertrochanteric-subtrochanteric region). According to this classification system, the femur is labeled bone 3, and the proximal femur segment is labeled 1. The “A” types are extracapsular fractures. Types A1.1 to A2.1 are generally considered to be stable patterns. Types A2.2 to 3.3 are usually considered unstable fractures.
