le fort osteotomy le fort osteotomy a le fort osteotomy is the name for three types of osteotomies of the jaw and face. they are based on the analogous bone fractures described by the french surgeon and physician rené le fort. le fort osteotomymeshd019340 type i the le fort i osteotomy advances the jaw in case of malocclusion and maxillomandibular deformities. type ii the le fort ii osteotomy treats maxillary fractures. type iii main article: le fort iii osteotomy the le fort iii osteotomy treats midfacial abnormalities and deficiencies. additional types "le fort iv" has been used to describe a monobloc frontofacial osteotomy in 2000s french literature, but the use is heavily disputed. in 2014, the same term was used by a japanese group to describe a "monobloc minus le fort i" osteotomy.