I am a 56 yr old female. For 2 months now, I have not been able to sit crisscross, due to pain in my left inside leg at the bottom of the crease. Now it has begun to hurt while I am walking. I have not injured my leg in any way. These symptoms just came on by itself. The entire back of the crease in my leg hurts when I get up and I limp for a few minutes. It almost feels like I could walk it out, but that does not happen.
There could be many reasons for the pain like cyst, old injury, synovial bursitis and what I suspect is hamstring strain, however without being evaluated can't be sure for that, so you need to show it to a physio or orthopedic doctor. Till then give rest, dont try to strain that part by repeatedly doing the same movement as cross sitting. Also having a knee cap or a crape bandage can help you to some extent while walking. Hope you find this useful of you need any help can revert