Changes

*Pelvic '''Obturator foramen diameter ratio''' (of Tönnis): A quotient of rotation that can be evaluated by dividing the horizontal diameter of the obturator foramen of the right side and that of the left. In neutral rotation the ratio is 1 but is considered to be acceptable when it is between 0.56 and 1.8. <ref name="Ruiz SantiagoSantiago Chinchilla2016"/> *Pelvic volar/dorsal tilt can be evaluated by lines '''Symphysis os-ischium angle''' (of Tönnis): This evaluates the pelvic position in the sagittal plane. Lines are drawn from the highest point of the ischium to the most prominent point of the symphysis, joining at the inside of the pelvis. The range of normal values is from 90 to 135° and is related to the infant’s age.<ref name="Ruiz SantiagoSantiago Chinchilla2016"/>