I know absolutely nothing about this post-stroke phenomenon. I don’t have it, have never had to deal with it, and have never learned about it or seen it clinically. But I was an orthopedic physical therapist, maybe PTs that deal with neurological impairments everyday would know something more than me. It seems like it might be caused by a muscle imbalance but why does it take so long to show up? I don’t know, something neurological is clearly going on. Here are some blog posts by stroke survivors that have had to deal with it.