Neck of Femur Fracture

The primary blood supply to the femoral head, which is most vulnerable in a displaced fracture of the femoral neck, is derived from the:

Which of the following is the most significant predictor of avascular necrosis (AVN) following a fracture of the femoral neck?

A 75-year-old female sustains a fall and presents with severe hip pain. Radiographs reveal a fracture of the femoral neck where the femoral head is completely displaced from the femoral neck, with no trabecular continuity between the head and the acetabulum, and the head is lying free in the acetabulum. This fracture is best classified as Garden's type:

A 35-year-old male sustains a high-energy trauma resulting in a displaced Garden's Type III fracture of the femoral neck. The most appropriate initial management strategy for this patient, considering his age and fracture type, would be:

An 82-year-old female with a history of osteoporosis presents after a fall, complaining of severe right hip pain and inability to bear weight. Radiographs confirm a displaced Garden's Type IV fracture of the right femoral neck. Given her age and fracture type, the most appropriate definitive surgical management is: