Figure 2.

Agreement between five definitions of accelerated knee osteoarthritis (AKOA; blue circles) and a comprehensive Kellgren–Lawrence (KL)-based definition (red circles). Circle size represents the sample size for each definition of AKOA. Superscripts refer to Table 1. JSW, joint space width.

^‡lenient KL definition was defined by a knee with no radiographic osteoarthritis at baseline but the KL score increased 2 grades within 4 years [Wesseling et al., 2015].

^§lenient JSW (averaged) definition was defined by an average JSW loss >0.25 mm/year over 4 years [Neogi et al., 2012].