OF spine classification of osteoporotic thoracolumbar vertebral body fractures by MRI and conventional radiographs only leads to high inter-observer agreement rates-an additional CT adds limited information for the of classification and the OF score

Table 2 Difference between OF classification based on CT and MRI versus MRI alone (OF MRI)

	Rater I (%)	Rater II (%)	Rater III (%)	Rater IV^a (%)	Rater V (%)	Mean (%)
No Difference	90.2	82.0	75.0	78.7	88.5	82.9
OF MRI: -1	3.3	9.8	12.5	6.6	6.6	7.8
OF MRI: -2	0	1.6	0	0	1.6	0.6
OF MRI: + 1	6.6	6.6	12.5	13.1	3.3	8.4
OF MRI: + 2	0	0	0	1.6	0	0.3

CT Computer tomography, MRI Magnetic resonance imaging, OF MRI -1 defines an OF type classified by MRI alone that considered the fracture morphology less severe by one grade compared to the OF type classified by CT and MRI (MRI + CT) (example: OF type II classified by MRI versus OF type III classified by MRI + CT), OF MRI -2: MRI alone considered the fracture morphology less severe by two grades compared to the OF type classified by CT and MRI, OF MRI + 1: MRI alone considered the fracture morphology more severe by one grade compared to the OF type classified by CT and MRI, OF MRI + 2: MRI alone considered the fracture morphology more severe by two grades compared to the OF type classified by CT and MRI
^a General orthopaedic surgeon, no spine specialist

ISSN: 1471-2474