Figure 1.

Classification criteria for OA. The main body of the classification criteria consists of six types of OA pathogenesis, eight types of medical findings (which can be grouped into two categories), and six types of the location. OA patients are divided into different types according to the pathogenesis (purple boxes), the supporting data next to the box showing the risk ratio of pathogenesis. Medical findings are shown in dark blue circles, and the percentage on the left represent their frequency of OA patients. Treatments are shown in green (basic treatment, the ordinal number is the order in OA Guideline), yellow (medication), orange (surgery) and black (treatment of primary disease) boxes. The location of the disease is represented by a hexagon. The connection between treatments, medical findings and location represents the choice of treatment that should be considered.