My tkr surgery was May 26, so I am just at 4 months. I have good bend and my extension is -9 which is not quite straight. Still have quite a bit of stiffness and if I sit for a long time I have a hard time walking when I first get up. My quad muscle is still weak, and I am still pushing myself up from a chair with my arms. Steps are still hard, esp going down. I have been trying to extend my walking time—I have done 2 miles but find the stiffness increases the longer the distance. Riding my bike is great—best exercise ever! Also doing some knee-free yoga, and finding it helpful. Just disappointed most in my extension. I want my leg straighter!!!