I live in a 3-story house. I’ve been able to go upstairs “like a normal person” for several weeks, relying less and less on the handrail over time, but had to do the “step-step” with both feet on the same tread going downstairs because my surgical knee wouldn’t bend enough going downstairs to lower my other foot to the next step. Wednesday and Thursday of this week, I went outside to a "short" porch step (some of our steps are one brick tall and some are two bricks tall – I used a one-brick step) and forced myself to keep my surgical leg's foot on the step, and bend my new knee and flex my ankle to lower my other foot to the next step. It hurt a little, but after repeating this exercise a few times, I felt some kind of loosening or release in the front of my knee and upper shin. It hurt a little and felt wonderful all at the same time. Today at PT, my ROM had increased about 5 degrees from Monday: 0 – 115 on my own, 0 – 120 when gently tugging on a strap, and 0 – 126 with a gentle push (only slight pain) by the therapist.
I described my home-grown exercise to the therapist. First he laughingly accused me of being a Type A engineer (guilty as charged), and then he found a way to get a little bit better, but still gentle stretch on the same parts. He had me stand with my back to a low table (about knee high), flex my knee to bend my leg up behind me so that the top of my foot was resting on the table, hold onto a chair for stability, and gently “squat” with my non-surgical leg to stretch the knee that was behind me. It felt like a good stretch without pain.