Differentiation between peripheral and central location of FHN and femoral cartilage damage is shown on a radial image. This is based on a line which is drawn perpendicular to the femoral neck axis. If the lesion is medial/lateral to this line it is referred to as being located central/peripheral, respectively. In this hip peripheral and central FHN (dashed line) was present at the 2 o’clock and at the 8 o’clock position.