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Table 3: Changes of content of adjacent and next-to-adjacent disks according to different manifestation of vertebral osteonecrosis
Changes of Adjacent Disks Changes in Affected Vertebrae
Air Only (n = 96) Fluid with Air (n = 52) Fluid Only (n = 94) P Value
Air in adjacent disks 41 11 <.05
    Upper 21 6 0 
    Lower 20 5 0 
Air in disks next to adjacent disks 12 3 <.05
    Next to upper 8 1 0 
    Next to lower 4 2 0

Changes of Adjacent Disks	Changes in Affected Vertebrae
Changes of Adjacent Disks	Air Only (n = 96)	Fluid with Air (n = 52)	Fluid Only (n = 94)	P Value
Air in adjacent disks	41	11		<.05
Upper	21	6	0
Lower	20	5	0
Air in disks next to adjacent disks	12	3		<.05
Next to upper	8	1	0
Next to lower	4	2	0