Proximal femoral fractures are among the most common femoral fractures. In the past plates and screws were often used to repair these fractures but this treatment had limitations including restricted weight bearing. Intermedullary nailing is an alternative to plate and screw treatment. Weight bearing is allowed and the procedure can be a less invasive. Among intramedullary nailing complications are iatrogenic fractures that can be further divided into trochanteric and femoral shaft fractures. Trochanteric fractures often heal without additional intervention however femoral shaft fractures usually require an additional surgical procedure to facilitate healing. This study will monitor fracture healing using clinical and radiographic evaluations of subjects with trochanteric fractures of the proximal femur treated with the ATN system.