Optimization strategies for intramedullary nailing parameters in subtrochanteric fractures of the femur: a multimodal assessment based on finite element and biomechanical experiments

For patients with Seinsheimer type IIC subtrochanteric femoral fractures who have good bone quality and a femoral neck anteversion angle ≤15°, this study proposes a personalized selection strategy using CT-based 3D reconstruction of the narrowest medullary cavity diameter, recommending an anatomically matched intramedullary nail (320 mm length) to optimize both mechanical stability and biological healing. The results provide important theoretical support for clinical precision treatment.