Final answer:
Femoral neck fractures should be fixed within 24 to 48 hours after the injury to promote proper healing and prevent complications.
Step-by-step explanation:
Femoral neck fractures should be fixed within a specific time window in order to promote proper healing and prevent complications. The ideal time window for fixing femoral neck fractures is between 24 and 48 hours after the injury. This is because early surgical intervention allows for better alignment of the fractured bone and reduces the risk of avascular necrosis, a potential consequence of delayed treatment.