According to this study, crossing your legs will only put pressure on the other leg’s bone nerve at the rear of the knee and this could impair within the lower legs and feet.
According to researchers, sitting with your legs crossed or what we call Indian sitting on the ground is even worse. This will cause the leg bone nerve palsy that may result to a “Foot drop” where in the front part of the foot and the toes can’t feel anything. Sitting in this manner will also cause back pain and neck pain. Be careful how you sit!
Source: http://www.naturalhealingmagazine.com