They are based on[1] the analogous bone fractures described by the French surgeon and physician René Le Fort.

[2] A Le Fort I osteotomy surgically moves the upper jaw to correct misalignment and deformities.

The procedure involves separating the upper jaw, repositioning it, and then securing it with plates and screws.

[5] "Le Fort IV" has been used to describe a monobloc frontofacial osteotomy in 2000s French literature, but the use is heavily disputed.

[6] In 2014, the same term was used by a Japanese group to describe a "monobloc minus Le Fort I" osteotomy.