Frontal section of medial compartment of knee. Branching radial vessels from perimeniscal capillary plexus (PCP) can be seen penetrating peripheral border of medial meniscus. F, Femur; T, tibia. Three zones of meniscal vascularity are shown: 1 RR, red-red is fully within vascular area; 2 RW, red-white is at border of vascular area; and 3 WW, white-white is within avascular area.