Does your surgeon know about Arthrofibrosis? This is a tight, dysregulated form of scar tissue that can be caused by knee surgery or injury. Check out the "International Arthrofibrosis Association", and "Bonesmart.org" . These websites are very knowledgeable about these pain problems - I understand your fears of another replacement. I feel the same way - have had a revision surgery because my first TKR resulted in Arthrofibrosis, and left me with only 40 degrees flexion - had to limp all the time. The revision surgery was only 3 months ago, so still waiting to see if there is improvement. I do have 90 degrees flexion (so far). Best wishes...... most docs do not know much about Arthrofibrosis.