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 3 Comparison of radiological outcomes in terms of the extent of femoral head collapse between preoperative and the last postoperative follow-up in Group A and B

ARCO classification	Group A		P value	Group B		P value	P value for improvement a
ARCO classification	preoperative	postoperative	P value	preoperative	postoperative	P value	P value for improvement a
IIIA	29	45	0.046	18	31	0.040	0.568
IIIB	41	30		21	14
IIIC	14	9		12	6

ARCO Association Research Circulation Osseous. a The comparison between Group A and B in terms of ARCO classification improvement was analyzed by Chi-square test. In Group A, 4 hips in ARCO IIIA were aggravated, 17 hips was stabilized, 8 hips were improved. 13 hips in ARCO IIIB were aggravated, 19 hips was stabilized, 9 hips were improved. 10 hips in ARCO IIIC were aggravated, 2 hips was stabilized, 2 hips were improved. In Group B, 3 hips in ARCO IIIA were aggravated, 7 hips was stabilized, 8 hips were improved. 5 hips in ARCO IIIB were aggravated, 4 hips was stabilized, 12 hips were improved. 6 hips in ARCO IIIC were aggravated, 3 hips was stabilized, 3 hips were improved

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