Hip dysplasia can cause an abnormal gait. As a result of hip dysplasia, one leg looks shorter or is turned to one side, when the baby walks with a limp, i.e. an uneven gait. In unilateral hip involvement, the child usually tries to compensate for the shortened limb by walking on the toes or flexing the opposite knee. In bilateral involvement, the typical gait is a duck stance, with increased spacing between the thighs and a widening of the perineum. The enlarged anterior pelvic tilt and posterior dislocation of the femoral head result in anterior lumbar protrusion and abdominal augmentation.