Table 1

Demographic characteristics, ONFH etiology, disease classification and femoral head involvement for ASA-treated patients

Patient #	Age, yr; sex^*	ONFH etiology	Laterality	ONFH lesion location	Pre-ASA Ficat stage	Most recent Ficat stage	Pre-ASA %femoral head involvement^†	Most recent %femoral head involvement^‡
1	65 M	Corticosteroids	Right	B	2	2	30	25
2	61 M	Alcohol	Left	C2	2	4	90	100
3	76 F	Corticosteroids	Right	B	2	2	20	20
3	76 F	Corticosteroids	Left	B	2	2	30	20
4	57 M	Unknown	Left	B	2	2	30	20
5	52 M	Corticosteroids	Left	C1	2	2	30	20
6	67 F	Corticosteroids	Left	C1	2	2	30	30
7	62 M	Unknown	Right	C1	2	2	30	30
8	28 F	Sickle cell	Right	C1	2	2	60	60
9	37 M	Sickle cell	Right	C1	2	2	50	25
9	37 M	Sickle cell	Left	B	2	2	25	25
10	43 F	Sickle cell	Right	C1	2	2	30	30

ASA = acetylsalicylic acid; F = female; M = male; ONFH = osteonecrosis of the femoral head.
↵* Mean 54.8 ± 11 yr.
↵† Mean 38% ± 20%.
↵‡ Mean 34% ± 24%.