Wondering if anyone else has had similar to this? For background, my unoperated leg also needs a TKR, and over the last 4 years has become 'bent' to match with the failed TKR knee. Now, after my revision, I am trying to exercise both legs equally as I think the extension is a little better on my new revision knee. However, yesterday I started to get terrific stabbing pains, like an electric shock, in my UNOPERATED leg, when stretching the leg -standing, leaning forward to stretch calf/hamstrings. Even the slightest stretch brings it on. This pain is just above and below the back of the knee, going down the medial side of the calf. Oddly this only happens in this particular standing position, not if sitting on bed and stretching forward, or with foot on stair and stretching forward. I am hoping it is just muscles in this leg 'waking up' and trying to extend a bit to match the new one. ANyone had similar? I am now doing gentle stretchs in this position, and holding for a little while, every time I get up to walk around, and also massaging the back of the leg. Any ideas what it could be or what might help?