Table 1.

ON patient characteristics.

Patient number	Sex	Age	Pathological changes	Steinberg classification	Inflammatory co-morbidities	Identifiable risk factors for ON
1	Female	80	Acetabulum, femoral head collapse	V	Temporal arthritis	Steroid use
2	Female	44	Acetabulum, crescent sign	III	SLE, RA, leukocyto- clastic vasculitis	SLE
3	Female	66	Acetabulum, femoral head collapse, sclerosis	V		Hyperlipidemia
4	Female	61	Acetabulum, femoral head collapse	V		Hyperlipidemia
5	Male	61	Crescent sign	III
6	Female	23	Femoral head collapse	IV	SLE	SLE
7	Female	69	Femoral head collapse	IV	Psoriatic arthritis	Hyperlipidemia, Smoking
8	Female	53	Crescent sign	III		Smoking
9	Female	50	Acetabulum, femoral head collapse	V
10	Female	73	Acetabulum, femoral head collapse, dysplastic hip	V		Hyperlipidemia
11	Male	32	Crescent sign	III	SLE	Hyperlipidemia
12	Female	49	Acetabulum, femoral head collapse	V
13	Female	39	Femoral head collapse, sclerosis	IV		Smoking
14	Male	56	Femoral head collapse, sclerosis	IV		Steroid use
15	Female	54	Acetabulum, femoral head collapse	V
16	Female	74	Acetabulum, femoral head collapse	V
17	Female	78	Acetabulum, femoral head collapse	V		Hyperlipidemia, Alcohol abuse
18	Female	55	Femoral head collapse	IV	Crohns disease, OA	Hyperlipidemia
19	Male	43	Acetabulum, femoral head collapse	V	RA
20	Female	64	Acetabulum, femoral head collapse	V	Microscopic poly- angiitis	Microscopic polyangiitis

SLE = systemic lupus erythematosus; RA = rheumatoid arthritis; OA = osteoarthritis.