@ddsack Thank you for your comments and advice. I will see PT in the near future. Saw my doctor yesterday. He said to rest my knee, ice it, and come back in 2 weeks. I asked if it were possible that I somehow pushed a nerve into the mechanism of the replaced knee that causes an impingement while attempting to bend my knee past a certain point. He said it was possible but unlikely. Apparently there is no way to ascertain this. We discussed manual manipulation as a last resort and that decision will probably be made within the next 30 days. To summarize, I was 115 degrees ROM 14 days post-op, then felt a "pop" behind my surgical knee while doing PT at home resulting in acute pain trying to bend more than 50 degrees. Saw doctor's PA 2 days after incident. She said "pop" was scar tissue breaking and a good thing. Not sure I agree. Doctor says no to ROM physical therapy while knee heals. Surgery was 22 July...scar tissue is forming...I see manipulation under surgery in the future. Any comments from anyone with similar experience will be appreciated. Thank you.