Fig. 1From: Composite quantitative knee structure metrics predict the development of accelerated knee osteoarthritis: data from the osteoarthritis initiativeExamples of Radiographic Changes that Define the Knee Osteoarthritis Groups and the Study Observation Period. This figure provides examples of Kellgren-Lawrence (KL) grades overtime in each of the knee OA groups. We focused on visits up to 2 years prior to and up to 2 years after the index visitBack to article page