People tend to get paranoid about getting addicted to certain pain meds. Now it's true you can become dependent upon them which is very different, and then you need to come off them slowly over a period of weeks or months but since you'll be needing to reduce them as your pain reduces, that shouldn't be too much of a problem anyway. The really important point is that studies show where there is pain that needs medicating, dependence is less of a problem than with those who take them as recreational drugs. You're not taking them like that - you have really good reason to take them, so as long as you have pain, don't worry about it. You'll find over time that you just naturally reduce them anyway. Also, a person depriving themselves of pain meds, who then gets severe pain, then starts to think the reason they are 'craving' the pills is because they are addicted! Hogwash! You're craving them because you're in pain! Big difference!
Now your meds: Endone/oxycontin is a form of oxycodone/Percocet but a timed release one giving 8-12 hrs pain relief unlike the regular ones which give 4-6 hrs relief. Like any other opioid, they can have issues of dependency in some people if taken over an extended period like 3-5 months.
Paracetamol and codeine (also known as co-codamol) is a pretty good pain reliever for mild to moderate pain but I wouldn't have wanted to be dependent on it for my TKR. I was prescribed Tramadol 50-150mgs which I took in combo with paracetamol 1 gram every 4-6 hrs as I decided I needed.
I mostly took 50mg during the day with ice or 100 if in a lot of pain but I always took a 100mg at night and occasionally 150 if there was a lot of pain. Good thing was, that if I took 100 upon retiring and then found an hour later I was still in pain, I still could take the other 50mg.
This regimen worked well for me and I took them for a full 2 months in these varying doses and as a result had a pretty comortable recovery. However there have been members here who have reported that Tramadol didn't suit them at all, doing nothing for their pain. Must say, however, that they were far exceed by those that seemed to find Tramadol effective.