Table 6 Comparison between single photon emission computed tomography (SPECT)/computed tomography (CT) and magnetic resonance imaging (MRI) in detecting the spectrum of changes in active spondylolysis (n  =  710).

	Bone scintigraphy/CT			Total
	Grade 0	Grade 1	Grade 2
MRI grade 0	660	10	0	670
MRI grade 1	0	21	1	22
MRI grade 2	0	0	18	18
Total	660	31	19	710

Grade 0, normal; grades 1 and 2, acute stress reaction.