Hello, As you are facing foot drop problem, difficulty in walking and doing normal routine work, we would suggest you to consult a good orthopedic, as he would be able to suggest you whether both your knees need to be replaced or not. No, you will not face any difficulty if you are considering getting your knee replacement done outside Kolkata, as hospitals and doctors across India are very cooperative and provides you intensive care so that you can recover fast and get back to your normal life. For your ease, we have mentioned some of the best orthopedic hospitals where you can get your knee replacement surgery done. Choose the nearest and best hospital for you from the mentioned page: Best Orthopedic Hospital in Kolkata. Hope this answer helps you!