Table 1

Table 1
Kellgren classification ⁴⁶
I	doubtful	minute osteophytes, doubtful significance
II	minimal	definite osteophytes, unimpaired joint space
III	moderate	moderate diminution of joint space
IV	Severe	joint space greatly impaired with sclerosis of subchondral bone

van der Hart et al. Journal of Orthopaedic Surgery and Research 2008 3:24 doi:10.1186/1749-799X-3-24