Figure 2. The Kaplan-Meier curve shows the survival estimate rate of KOA participants not undergoing any surgical intervention after treatment of PRP enhanced with iPRF intra-articular injection categorized by radiographic severity.

The thick line represents participants with radiographic KL I-III (group 1). The dotted line represents participants with radiographic KL IV (group 2).

KOA: Knee osteoarthritis, PRP: Platelet-rich plasma, iPRF: Injectable platelet-rich fibrin, KL: Kellgren and Lawrence