Normal AP Femur X-ray

A 3-year-old boy is brought to the emergency department with a fracture of the structure marked **D** (femoral shaft) following a fall from a height of 2 meters. The child is non-ambulatory and was not yet walking at the time of injury. On careful history, the parents report the child "fell while playing indoors." Which of the following is the MOST appropriate next step in management?

A 28-year-old man is brought to the emergency department following a high-speed motor vehicle collision. X-ray of the pelvis and femur shows a comminuted fracture of the structure marked **A** in the diagram. The patient is haemodynamically stable with no other life-threatening injuries. According to current orthopedic standards, what is the most appropriate definitive management for this fracture?