I can't help much with you propulsion problems, but I would definitely advise you to see another doctor! With the way things are today with total knee replacements there is absolutely no need to endure the pain daily. There is also no real reason to wait until "they lockup" to have replacements. My wife had both knees replaces 4 years ago about 6 weeks apart, and the ONLY thing she regrets is that she did not do it a year or more sooner. No more crying most of the night from the pain or when she had to drive one of those motorised carts around Walmart. If you have yours done now then in a year you will also be able to say I'm sorry I didn't do this sooner.