Final answer:
The external rotation of the patient's left foot could indicate a fractured hip, which is common in the elderly and requires surgery and extensive recovery. Complications can lead to increased morbidity and mortality.
Step-by-step explanation:
One sign indicating the possibility of a fractured hip after a patient has fallen while ambulating in the hallway is C. The patient's left foot is externally rotated. This could suggest a fracture of the femoral neck, which comprises a "broken hip." Hip fractures often occur in elderly individuals with conditions such as osteoporosis, which weakens bones and makes them more susceptible to breaking. Such injuries typically require surgical treatment and a lengthy recovery with mobility assistance. In addition to the medical demands, hip fractures carry significant risks of morbidity and mortality due to complications such as pneumonia, infection of pressure ulcers, and thrombophlebitis leading to pulmonary embolism.