Association of inflammatory, genetic, and epigenetic markers with Kellgren-Lawrence grading in post-traumatic osteoarthritis of knee: A protocol

Table 1 Kellgren-Lawrence radiographic osteoarthritis grading[10]

Grades	Changes seen in X-ray
Grade 0	None. Absence of X-ray changes
Grade 1	Not severe. Doubtful narrowing of joint space and possible osteophytic lining
Grade 2	Minimal severity. Definite osteophytes and possible narrowing of joint space
Grade 3	Moderate severity. Moderate multiple osteophytes, definite narrowing of joint space and some sclerosis and possible deformity of bone ends
Grade 4	Severe. Large osteophytes, marked narrowing of joint space, severe sclerosis and definite deformity of bone ends