A lateral coronal ultrasonography image through the right hip joint of a 4-week-old girl with a normal clinical hip examination.1, chondro-osseous junction between the bony part and the cartilaginous part of the femoral neck; 2, cartilaginous part of the femoral head (hyaline cartilage); 3, greater trochanter; 4, iliac bone; 5, lower limb of the ilium and bony acetabular roof; 6, cartilaginous acetabular roof; 7, acetabular labrum; 8, synovial fold.