Why most patients do not exhibit obstructive sleep apnea after mandibular setback surgery?

Maxillofacial Plastic and Reconstructive Surgery

Table 4 Reported obstructive sleep apnea after mandibular setback surgery

	Amount of mandibular setback (mm)	Age	Sex	BMI before surgery (kg/m²)	AHI (before surgery)	AHI (after surgery)	OSA category after surgery
Hasebe (2011) [3] (n = 2/22)^a	13.7 (at Pog)	22	M	20.6 healthy	4.4	12.1	Mild sleep apnea
	12.6 (at Pog)	18	F	21.3 healthy	2.1	5.4	Mild sleep apnea
Uesugi (2014) [26] (n = 1/40)^a	10.1 (at Pog)	54	M	34.4 obesity	14.9	19	Severe sleep apnea
Yang HJ (2020) [4] (n = 4/12)^a	12.88 (at B)	23	F	24.2 healthy	2	8.2	Mild sleep apnea
	9.61 (at B)	22	M	25.2 overweight	1.3	6.3	Mild sleep apnea
	14.26 (at B)	22	M	18.9 healthy	0.2	7	Mild sleep apnea
	11.56 (at B)	22	M	21.5 healthy	2.9	5.2	Mild sleep apnea
Total	12.1 ± 1.8	26.1 ± 12.4	M = 5; F = 2	23.7 ± 5.2	4.0 ± 5.0	9.0 ± 5.0

^aIncidence of OSA after surgery. BMI category: obesity, ≥ 30; overweight, 25–29.9; healthy weight, 18.5–24.9; underweight, < 18.5 [31]. OSA category: normal, AHI < 5; mild sleep apnea, 5 ≤ AHI < 15; moderate sleep apnea, 15 ≤ AHI < 30; severe sleep apnea, AHI ≥ 30 [30]