Predictors for Unfavorable Early Outcomes in Elective Total Hip Arthroplasty: Does Extreme Body Mass Index Matter?

Table 1

Demographics, preoperative comorbidity, and operative variables in different BMI groups.

BMI	<18.5	18.5–24.99	25–29.99	30–34.99	>35	value
Number of patients	56	697	609	158	45
Mean BMI (SD), kg/m^2	17.35 (1.28)	22.57 (1.66)	27.21 (1.41)	31.95 (1.29)	37.60 (2.94)	<0.001^a
Mean age (SD, range), y	47.0 (16.8, 22–83)	54.6 (14.6, 16–91)	57.5 (13.2, 15–87)	56.0 (14.0, 21–87)	57.2 (12.2, 26–77)	<0.001^a
Sex, n (%)						<0.001^a
Male	23 (41.1)	289 (41.5)	327 (53.7)	80 (50.6)	16 (35.6)
Female	33 (58.9)	408 (58.5)	282 (46.3)	78 (49.4)	29 (64.4)
Pathology, n (%)
OA	3 (5.4)	110 (15.8)	135 (22.2)	24 (15.2)	7 (15.6)
Osteonecrosis	35 (62.5)	317 (45.5)	215 (35.3)	66 (41.8)	11 (24.5)
Inflammatory	11 (19.6)	34 (4.9)	32 (5.3)	6 (3.8)	2 (4.4)
Dysplasia	7 (12.5)	212 (30.4)	192 (31.5)	57 (36.1)	24 (53.3)
Perthes disease	0	10 (1.4)	13 (2.1)	2 (1.3)	0
FAI	0	9 (1.3)	17 (2.8)	3 (1.8)	1 (2.2)
OA hip secondary to childhood septic hip	0	5 (0.7)	5 (0.8)	0	0
Fixation, n (%)						0.58
Cemented	0	1 (0.1)	0	0	0
Hybrid	0	8 (1.2)	2 (0.3)	1 (0.6)	0
Cementless	56 (100)	688 (98.7)	607 (99.7)	157 (99.4)	45 (100)
ASA score
1-2	45 (80.4)	536 (77)	498 (81.8)	119 (75.3)	31 (68.9)	0.07
3-4	11 (19.6)	161 (23)	111 (18.2)	39 (24.7)	14 (31.1)
Comorbidity, n (%)
Cardiovascular comorbidities	11 (19.6)	252 (36.2)	306 (50.2)	103 (65.2)	33 (73.3)	<0.001^a
Respiratory comorbidities	10 (17.9)	104 (14.9)	82 (13.5)	26 (16.5)	9 (20.0)	0.629
Diabetes	3 (5.4)	71 (10.2)	91 (14.9)	37 (23.4)	17 (37.8)	<0.001^a

OA, osteoarthritis; FAI, femoroacetabular impingement; SD, standard deviation. ^aStatistically significant difference ().