Each true leg has seven segments&colon; coxa, trochanter, femur, patella, tibia, metatarsus, and tarsus. The two basal segments preceding the femur are the coxa and trochanter. Distally the coxa bears an anterior and a posterior articulation with the trochanter. The trochanter articulates with the coxa but usually is attached rigidly to the femur. The hind femora also fit into recesses of the coxa. In order from the body they are the coxa, trochanter, femur, tibia, and tarsus. In Micropterigidae, the legs are three-segmented, as the coxa, trochanter, and femur are fused. It is also used to correct a coxa vara, genu valgum, and genu varum. They are&colon; coxa, basis, ischium, merus, carpus, propodus, and dactylus. The most common cause of coxa vara is either congenital or developmental. It consists of a single sclerite situated between the coxa, opposite the carapace. The sclerites at the base of the coxa are yellow or orange. The posterior lobe is the meron which is usually the larger part of the coxa. The coxa is the proximal segment and functional base of the leg. In many species the coxa has two lobes where it articulates with the pleuron.