Hammond, DouglasWilliams, Rhodri W.Juj, KiranjitO'Connell, SusanIsherwood, GrantHammond, Nichola2024-06-212024-06-212015-09Hammond D, Williams RW, Juj K, O'Connell S, Isherwood G, Hammond N. Weight loss in orthognathic surgery: a clinical study. J Orthod. 2015 Sep;42(3):220-8. doi: 10.1179/1465313314Y.0000000130. Epub 2015 Apr 22.1465-312510.1179/1465313314Y.000000013025904194http://hdl.handle.net/20.500.14200/4939Objective: To analyse weight change, body composition change and Body Mass Index change in patients undergoing orthognathic surgery. Design: A service evaluation was undertaken in orthognathic patients pre-operatively and at 4 weeks post-surgery. Setting: Queen Elizabeth Hospital Birmingham outpatient department. Subjects: Thirty-one patients scheduled for single- or two-jaw orthognathic surgery and rigid internal fixation. Methods: Immediately pre-operatively and at 4 weeks post-surgery the following information was gathered: (1) patient height; (2) patient weight (kg); (3) Patient Body Mass Index; and (4) patient body fat percentage. Results: In the 4-week post-operative period, the average weight loss was -4·96 kg (range: -9·6 to +3·0 kg), with a body fat reduction of -3·07% (range: -5·80% to +2·30%) and an average reduction in Body Mass Index of -1·63 (range: -3·4 to +0·8). There was no statistically significant difference in weight loss (P = 0·1562) or body fat composition change (P = 0·2391) between single- or two-jaw surgery. There was no statistically significant difference in weight loss (P = 0·4858) or body fat composition change (P = 0·5321) between male and female patients. Conclusions: Weight loss observed was similar to that reported in studies using inter-maxillary fixation. Closer psychological and dietetic support is needed for patients who have a low normal or underweight Body Mass Index. Better and more bespoke tailored Oral Nutritional Supplementation must be provided for all orthognathic surgery patients to potentially reduce this significant weight loss.enDentistrySurgeryDiet & nutritionArticle