Well, both my knees have been replaced twice and both hips are replaced. My left hip was done 3 months ago and I am also 77. I am fairly active and average weight female. I must say, the first few weeks are very awkward even with a walker. I guess your DR has never had a joint replacement. He /she obviously has never maneuvered a walker while trying to make a meal, balance it it to a table or chair or even carry a coffee/drink to enjoy while watching TV. If possible, treat your self with due respect. Seek assistance, you know yourself best. The first few weeks or month are challenging. You do not want an accident. One thing I would stress, do not twist your leg, always tun gently and move your feet in same direction to avid twisting. Best wishes.