Jaw disproportion

Mandibular procedures

Bilateral Sagittal Split Osteotomy (BSSO)

Vertical Sub-Sigmoid Osteotomy (VSSO)

Inverted L osteotomy – many similarities to the above but this operation is now used so rarely that we would advise seeking advice from the surgeon who choses to use it.

Anterior subapical osteotomy – again not an operation currently in vogue.

Posterior subapical – even more so. In the event of being likely to undergo this operation we would recommend asking questions of your surgeon.


A relatively common operation which is done by other surgical disciplines although this is usually by way of implants. The timeline here describes the more usual maxillofacial version which is a true osteotomy of the chin.

Maxillary procedures

Le Fort I osteotomy

Wassmund procedure

Rarely used now, as a modification of the Le Fort I is more commonly used.

Surgically Assisted Rapid Palatal Expansion (SARPE)