@canis and others, I haven't read through all the posts here, about half, but one thing I wanted to mention was that in deciding which way to go with my total knee implant, I looked into lawsuits against the companies. They all have them, which makes sense, as there were mistakes made as new implants came into use. I would think the surgeons and companies would inform you if there were a chance that your implant was defective, but you never know. Also, on the issue of size, my surgeon explained after I asked that he had put in a size 3 (Stryker, where the sizes range from 2 on the small side to 8 on the large). I was surprised but it turns out my bones are rather small. I will see him again next week and want to ask more about that. He showed me the x-rays (I was heavily drugged) and said the fit was perfect. So size could be important, and having a new set of x-rays evaluated by a different surgeon could help. Sorry if I'm repeating info others already have provided. Best of luck.