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Obstructive sleep apnoea (OSA) is a serious condition that can be the cause of a number of systemic symptoms and conditions. The diagnosis of OSA is made by clinical and radiological examination, with polysomnography as the gold standard for recording the severity of the disorder. Among the many therapies offered for OSA, maxillomandibular advancement is recognized as a powerful technique for relieving upper airway obstruction. The upper airway may be further opened by an advancement genioplasty, but this may compromise facial aesthetics by over-projecting the chin prominence. To overcome this difficulty, a modified genioplasty is presented. This is designed to enable a rotational repositioning that allows for advancement of the genioglossus attachments but also avoids an excessive projection of pogonion, which would otherwise result in an unfavourable profile.