Table 1 Kellgren-Lawrence grading scale [15]

Grade 0

No signs of degenerative disc disease

Grade 1

Minimal anterior osteophytes

Grade 2

Definite anterior osteophytosis with possible narrowing of the disc space and some sclerosis of vertebral plates

Grade 3

Moderate narrowing of the disc space with definite sclerosis of vertebral plates and osteophytes

Grade 4

Severe narrowing of the disc space with definite sclerosis of vertebral plates and multiple large osteophytes