I had both knees replaced a year and ahalf ago. I am 49 yrs. The day after surgery the pt came in and pushed the right knee back to far to get the first measurement and tore the quad tendon 90 %. I have had 6 knee surgeries since, 5 on the right and one on the left. I have alot of scar tissue problems becasue of the damage. I am currently bodge down at 65 % bend in the right. Dr. Wants to do another malnipulation in hopes in getting another 10 degrees. He wants me to consider replacing the right knee replacement with a different one that does not require stong tendons or ligament. It has longer post than the one I currently have and I will lose some side motion. It will only last maybe 8 to 10 years. Has anyone else had problems like I have had?? thanks parky