If an elderly person sprains something due to osteoporosis, the first thing to do is to minimize movement to avoid worsening the injury. Apply a cold compress to reduce swelling and pain, usually recommended within the first 24 to 48 hours after the injury. After that, a warm compress can help promote blood circulation and speed up recovery. Adequate rest and elevating the injured area can also help reduce discomfort. If the pain is severe, painkillers can be used under the guidance of a doctor. Finally, make sure to see a doctor in a timely manner to ensure there are no more serious injuries.