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. Author manuscript; available in PMC: 2014 Sep 1.
Published in final edited form as: Osteoarthritis Cartilage. 2013 Sep;21(9):1199–1206. doi: 10.1016/j.joca.2013.05.013
Joint space
narrowing
(JSN)		 Osteophytosis of
articular processes		 Hypertrophy of
articular processes		 Sclerosis Subchondral
erosions		 Subchondral
cysts		 Joint space vacuum
phenomenon
Grade I (Normal) Joint space
>2mm (no JSN)		 None or possible
small osteophytes		 None None or
doubtful		 None None None
Grade II (Mild) Joint space 1-2
mm		 Definite small
osteophytes		 Mild Definite None None None
Grade III (Moderate) Joint space <1
mm		 Moderate
osteophytes		 Moderate Definite Mild Mild Any
Grade IV (Severe) Bone-on-bone Large osteophytes Severe Definite Severe Severe Any