I am 2 weeks post-TKR surgery with patella button on my left knee. Pain has significantly subsided. Swelling has ostensibly mostly abated, but the knee is very stiff, thus I surmise there is still significant internal swelling. I slept 6 hours last night, a post-op record. I am suffering some anxiety re ROM. I am currently at est. 60-65 flexion and est. 12 extension. Flexion seems to be limited by a very tight quad, but of course there might be something else going on. Extension seems limited at the patella -- it feels that it would pop off if I forced an extension. I have been doing very gentle exercises (provided by PT on day of surgery), never pushing to pain. My first PT appointment is in 6 days. I saw my OS's PA yesterday, who said he'd like to see my extension at 90 by my first PT appointment. That seems impossible. Prior to my surgery, my PT advised that working on extension early is more important that flexion, which he said will take time, perhaps months. He warns that lack of full extension can have a ripple effect on hip, opposite leg and back. That makes sense to me. AFAICT, my PT will not force anything and eschews the dubious "no pain no gain" dogma. FWIW, I had limited ROM prior to surgery, est. 100 flexion, 5 extension. I was very active (hiking, skiing, XC skiing, ski touring, climbing, bicycling, mountaineering, ex-runner) and I have thick leg muscles and stout tendons and ligaments. I have never been very flexible. OS said he installed the next-to-largest size knee hardware (Stryker Triathlon #7). He also warned pre-op that, because I my legs are heavily muscled, the surgery would result in more tissue damage. Other than ROM anxiety, I am optimistic about my recovery.