A 20-year-old injury is a very long time. There are chances that the injury that occured at that time is now causing the development of arthritis in the knee or ankle that is causing recurrent episodes of swelling in the leg. Also, there are chances that due to old age, there might have been minor fractures due to osteoporosis which can again cause such presentations. To be very sure of either diagnosis, I will need an X-ray of the patient's leg and knee. Also, details on his current medicines, any other medical history like hypertension or diabetes, or any other significant illness. The leg swelling is also caused by cardiac issues, which must be ruled out. Please get back with all these details so we can plan for the best possible treatment for your father.
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