My mom was almost eighty when she tripped and shattered her kneecap. She was in excellent health, just had a senior moment and didn't notice a step. After the surgery, the doc told her she would never get about without assistance if at all.
He didn't know her.

She got annoyed with the cane and ditched it after 3 weeks. After a treatment the physio asked her if someone was picking her up. No, she was o.k. she would walk.
Him" Whaat?"
Her "Oh yes, I will be fine."
Him "How did you get here?"
Her "I walked."
Him" Why are you here?"
Her" The doctor said I should"
Him (laughing) " Get out of here, you don't need me. You are doing far more for yourself than I ever could."
She lived 9 blocks from his office.
My wife suffers from painful knee inflammation but refuses to let it stop her. For those of you with knee surgery or replacements, get back on your feet as soon as you can and get it working. After injuring mine in a motorcycle accident, the doc told me to keep it moving. Three weeks of inactivity would mean three months of therapy.