KneeOA This is to display and compare 4 progression subtypes based on population-level average using the OAI datasets: KLG0-->KLG1 KLG0-->KLG1-->KLG2 KLG0-->KLG1-->KLG2-->KLG3 KLG0-->KLG1-->KLG2-->KLG3-->KLG4