Hi, Mamie.....I'm glad you have a thread now in the pre-op forum where you can ask questions and let us help soothe your nerves. We all get a bit nervous before surgery - it's normal! And, given your surgeon's gloom and doom predictions for you, no wonder you're thinking this may be a real challenge.
I'd like to tell you some of the things that should be different this time from your 2005 TKR. Surgical techniques have improved dramatically since then. Doctors frequently can get in and out of your knee much faster, even if they have to remove scar tissue. As Jaycey said, the surgeon won't really know what needs to be done until he gets into you knee, so it's pretty difficult to say exactly how long the surgery will take. As for pain afterwards, pain management techniques have improved as well. Ask if your surgeon uses a pain protocol called Exparel. It's very popular these days and works well to keep you pretty much pain free the first few critical days after surgery. A cocktail of pain medications in injected deep into the tissues around your incision just before they close and it works wonders.
I can't promise you a walk in the part with recovery, but if you are reasonably healthy and mobile, you should be fine. I'm assuming you've had a meeting with your cardiologist to discuss the stents. I'm not sure why anyone would say that having them would cause you to not do well in surgery. If they are functioning properly, you should be just fine. But your cardiologist is the one who should clear you for the procedure. Once you are cleared, you can rest assured that the anesthesiologist will be monitoring you closely. They are used to working with patients with various heart issues and have many ways to handle anything that would come up during surgery. If you have a choice, it would probably be best to have your revision done in a full-fledged hospital rather than an outpatient or orthopedic specialty hospital. That way, if there was a problem, cardiologists would easily be available to assist immediately.
Home health should not be a problem for you. Just let your surgeon know your circumstances and request that he order home health for you. I used home health for both my knees for all my therapy as I felt more comfortable not having to get dressed and drive to an outpatient facility. It worked great.
Your purchase of a stationary bicycle was a smart one, as it can be a great tool to gently help you begin to get your range of motion back. The first few weeks you'll be focusing on healing for your knee rather than a lot of exercises. Gentle bends and stretches throughout the day and some walking every couple of hours should be just fine to keep your knee mobile and loose. Then, once you are healed a bit, you could start some additional exercises or activity.