Final answer:
The femoral neck of the femur is prone to displacement during fractures, which can lead to serious complications such as necrosis and require surgical treatment.
Step-by-step explanation:
The part of the femur that is more likely to displace and cause additional complications is the femoral neck. Fractures of the femoral neck can disrupt the blood supply to this area, potentially leading to necrosis of the bone and cartilage. This type of fracture is common among elderly individuals with weakened bones from conditions such as osteoporosis. These fractures typically require surgical treatment, and postoperative complications may include pneumonia, pressure ulcers, and thrombophlebitis leading to pulmonary embolism.