Hello. If the signs of dementia are seen for less than two months, you may want to discuss with the doctor about possibility of another condition. Dementia usually develops slowly over several months and symptoms must be present for at least six months to make the diagnosis. After fracture of femur, delirium is a common complication. In Delirium, there is disorientation, distractibility, hallucinations, sleep-wake cycle reversal and a fluctuating mental state. Hospitalization can be very stressful. It can cause depression. Depression may sometimes mimic dementia. Seeing people around dying is not directly going to cause dementia which is a neurodegenerative disorder. Based on information given by you, this is what can be said. I hope I have answered your question.