Table 1.

Larsen’s grading system for RA

Grade	Definition
0	Normal
1	Soft tissue swelling, slight joint space narrowing (< 25% of the original joint space), periarticular osteoporosis
2	Definite early abnormality, one or several small erosions
3	Medium destructive abnormality, marked erosions
4	Severe destructive abnormality, large erosions
5	Gross deformity, the bony outlines of the joint have disappeared