Hello, I am new to this forum and after reading a few posts, this really is a wonderful place. Great support and valuable information. To my post: I am lying here two weeks post L knee TKR with back pain and spasms when getting up and moving around. I have had what I thought was a really good post op recovery, making good progress with ROM and walking with mild to moderate pain. Then day 10 I developed some left side lower back pain which has progressed to spasms and generally a cramped R lower back. Now I have difficulty walking on both legs. I know its early and been only a few days of some pretty intense back pain. But Other than venting some frustration, I was wondering if anyone has had any similar experience?