Is possible to symetrize a mesh usint the same vertices on the model ?

Explaining what I want to do is lik ethat ... I have messed the vertices of my model and is no more symetrical , the vertices for both sides of the x y z axes are the same but are moved , repositioned rotated etc .. is it possible to choose one good side and mirror it's arrangement on the other side ? may be just on portion of vertices?

3dsmax btw ...