Getting old really sucks as everything is slowly falling apart. My boat is running better than me. Maybe 10 years ago, I had some knee surgery but it was a nodule growing within the knee, not the knee itself. The problem was if he trimmed it from the ligament, it would eventually grow back again. Or, take the whole ligament out including the nodule and its gone. If I took out the whole ligament, I can't use my leg anymore. Or, come back and have it trimmed once in awhile. I chose the second. Getting old sucks big time!
Good luck with the surgery. Use the pain killer correctly with Extra-Strength Tylenol as back up!