A comparative study of cortico-cancellous iliac bone graft with or without the combination of vascularized greater trochanter flap for the management of femoral head osteonecrosis: a minimum 6 years follow-up

Table 1 Comparison of baseline characteristics of Group A and B

Characteristics	Group A	Group B	P value
No. of patients(Hips)	77 (84)	46 (51)
Age (years; mean ± SD, [range])	33.2 ± 5.7 (18–45)	32.8 ± 5.0 (18–45)	0.724
Sex(female/male)	46/31	26/20	0.850
BMI(kg/m²)	22.0 ± 1.2 (19.5–25.4)	22.3 ± 1.3 (19.8–24.9)	0.335
F-U time (years; mean ± SD, [range])	9.7 ± 1.4 (6–12)	9.8 ± 1.3 (7–12)	0.789
Affected hips (Right/Left)^a	48/36	27/24	0.722
Risk factors
Alcohol	24	15	> 0.999
Corticosteroid	36	20	0.852
Idiopathic	17	11	0.827
ARCO stage
IIIA	29	18	0.537
IIIB	41	21
IIIC	14	12

BMI Body Mass Index, F-U Follow-Up, ARCO Association Research Circulation Osseous. ^a7 patients had bilateral involved hips in Group A, while Group B had 5 patients with bilateral affected hips. P < 0.05 indicates significance

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