It has been over 2 years since my total knee replacement and I have had nothing but trouble with it. It has been deemed a failed surgery with pain which still wakes me up at night, swelling, and clicking or popping in and around the implant. Within the next 2 weeks, I will be seeing the knee surgeon and will BEG him to order an MRI of the knee. By the way, my original surgeon retired since the surgery and passed me along to a "fresh set of eyes" as he said before he dumped me. The popping and snapping of the joint is getting worse.