Table 1.

Radiographic grading of discs according to Mimura et al ¹³

Disc height (% of adjacent discs)	Osteophyte formation (sum of points on 8 edges: <3 mm 1 pt., >3 mm 2 pts.	Endplate sclerosis
0 = normal	0 = 0 point	0 = none
1 = mild (>75%)	1 = 1–4 points	1 = either endplate
2 = moderate (>50%)	2 = 5–8 points	2 = both endplates
3 = severe (>25%)	3 = 9–12 points
4 = very severe (<25%)	4 = 13–16 points

1, 0 to 1.5 points; 2, 2 to 3.5 points; 3, 4 to 6 points; 4, score of 6.5 or greater.