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Table 1 Levels of radiographic knee osteoarthritis according to the Kellgren and Lawrence scale

From: Radiographic knee osteoarthritis in ex-elite table tennis players

Stage Kellgren & Lawrence criteria Ex-elite table tennis players (n = 22) Control subjects (n = 22)
0 Normal 5 (22.7%) 14 (63.7%)
1 Doubtful narrowing of joint space and possible osteophytic lipping 5 (22.7%) 7 (31.7%)
2 Definite osteophytes and possible narrowing of JS 6 (27.3%) 1 (4.5%)
3 Moderate multiple osteophytes,
definite narrowing of JS,
some sclerosis and possible
deformity of bone contour
5 (22.7%) 0
4 Large osteophytes, marked narrowing of JS, severe sclerosis, and definite deformity of bone contour 1 (4.6%) 0
  1. JS = joint space