An anteroposterior (AP) radiograph of the pelvis shows the different landmarks marked to measure leg length discrepancy (LLD).CH = center of the femoral head; LT = tip of the lesser trochanter; BI = biischial line; IT = interteardrop line; FDL = Femoral Diaphyseal Line.Original radiograph image courtesy of Dr. Ian Bickle, Radiopaedia.org, rID: 37956