Liouville regular Jordan curves

We investigate the class of Liouville regular Jordan curves, which was introduced in our previous paper under the phrase “Jordan curves that admit continuous Legendrian lifts”. We prove that a Jordan curve satisfying certain variation condition in a neighborhood of each point is in this class. We also prove that the boundary of a Jordan domain is Liouville regular if the images of the radial tails under a conformal mapping have uniformly vanishing length. Together with our previous result, these criteria imply the existence of an inscribed rectangle in every prescribed similarity class.