Table 1. Radiographic grading system for lumbar intervertebral disc degeneration.

Height loss	Osteophyte formation	Diffuse sclerosis	Overall degree of degeneration
Anterior and posterior height loss with respect to the individual height before degeneration	Sum of points of eight edges	Sum of points of both adjacent vertebral bodies	Sum of points of "Height Loss", "Osteophyte Formation" and "Diffuse Sclerosis"
	No osteophytes: 0 points	No sclerosis: 0 points
	<3 mm: 1 point	0.25 partially or completely affected: 1 point
	≥3 mm but <6 mm: 2 points	0.5 partially or completely affected: 2 points
	≥6 mm: 3 points	>0.5 partially or completely affected: 3 points
0=0%	0=0 points	0=0 points	0 point = grade 0 (no degeneration)
1=<33%	1=1–8 points	1=1–2 points	1–3 points = grade 1 (mild degeneration)
2=≥33 but <66%	2=9–16 points	2=3–4 points	4–6 points = grade 2 (moderate degeneration)
3=≥66%	3=17–24 points	3=5–6 points	7–9 points = grade 3 (severe degeneration)