Table 3.

Longitudinal changes in the osteonecrotic lesions in children observed with magnetic resonance imaging during the first year after alloHCT.

MR results before alloHCT		MR results one year after alloHCT			Total
		Not Involved	ON; < 30% Epiphyseal involvement	ON; ≥ 30% Epiphyseal involvement
Hips:	Not done/Missing	63	0	3∞	66
	Not Involved	49	0	4∞	53
	ON; < 30% Epiphyseal involvement	1•	1	0	2
	ON; ≥ 30% Epiphyseal involvement	1•	0	2	3
	Total	114	1	9	124
Knees:	Not done/Missing	59	8∞	5∞	72
	Not Involved	34	7∞	5∞	46
	ON; < 30% Epiphyseal involvement	2•	7	1	10
	ON; ≥ 30% Epiphyseal involvement	0	1±	0	1
	Total	95	23	11	129

Abbreviations: alloHCT, allogeneic hematopoietic stem cell transplantation; MR, magnetic resonance imaging; ON, osteonecrosis

^•Cases that showed complete resolution;

^∞New lesions identified during first year

^±Cases that showed regression of the osteonecrosis lesion