Fig. 10From: Postoperative radiograph of the hip arthroplasty: what the radiologist should knowThe horizontal centre of rotation is defined as the distance between the centre of the femoral head (point C) and the lateral outline of the teardrop shadow. The vertical centre of rotation is defined as the distance between the centre of the femoral head (point C) and the transischial tuberosity line (line D)Back to article page