Table 1.

Criteria for grading severity of arthritis in facet joints

Grade	Criteria
0	No narrowing, sclerosis, or osteophytes
1	Joint space narrowing or irregularity
2	Narrowing plus sclerosis and/or hypertrophy with osteophyte formation
3	C omplete narrowing, sclerosis, and/or severe osteophyte formation

Adapted from Weishaupt et al. Skeletal Radiol 1999;28:215-9, with permission of Springer Science+Business Media [9].