Orthognathic surgery is surgery to correct conditions of the jaw and face related to structure, growth, sleep apnea, TMJ disorders or to correct orthodontic problems that cannot be easily treated with braces. It is also used in treatment of congenital conditions like cleft palateJosip Bill, Peter Proff, Thomas Bayerlein, Torsten Blens, Tomas Gerdrange and Jürgen Reuther Orthognathic surgery in cleft patients ,Journal of Cranio-Maxillofacial Surgery, Volume 34, Supplement 2, September 2006, Pages 77-81 . Bones can be cut and re-aligned, held in place with plates and screws.