Assessment of disease activity using a whole-body MRI derived radiological activity index in chronic nonbacterial osteomyelitis

Table 2 RAI-CROMRIS

PARAMETERS		SCORE
Hyperintensity within bone marrow	Absent	0
Hyperintensity within bone marrow	Present	1
Extension*	< 25%	1
	25–50%	2
	> 50%	3
Soft tissue hyperintensity/periosteal reaction	Absent	0
Soft tissue hyperintensity/periosteal reaction	Present	1
Bone expansion	Absent	0
Bone expansion	Present	1
Vertebral compression	Absent	0
Vertebral compression	Present	1

The parameters included and score assigned to each variable for active CNO lesions. Adding up all parameters a maximum score of seven was obtained for each bone
*In long bones the extension of bone edema < 25% was defined if one part out of five was involved, between 25 and 50% if two parts out of five were involved and of > 50% if three or more parts were involved. In complex bone and on the spine extension was defined as in CROMRIS scoring with 1 point an extension < 25%, 2 points an extension between 25 and 50% and 3 points with an extension > 50%

ISSN: 1546-0096