Thank you for posting your query.
First of all, there is no relation between knee replacement
surgery and your father's memory problems. They are unrelated.
MRI brain findings in your father are suggestive of reduced blood flow to brain. This can lead to memory problems and it is related to high BP
, high sugar, high cholesterol
For treatment, he needs to keep his BP, sugar and cholesterol within normal levels.
In addition, he may require aspirin
Dr Sudhir Kumar MD DM (Neurology)
Senior consultant Neurologist
Apollo Hospitals, Hyderabad