This leads to four quadrants and a normal femoral head has to be located in the inferomedial quadrant.
Symphysis os-ischium angle (of Tönnis): This evaluates the pelvic position in the sagittal plane.
In neutral rotation the ratio is 1 but is considered to be acceptable when it is between 0.56 and 1.8. Obturator foramen diameter ratio (of Tönnis): A quotient of pelvic rotation by dividing the horizontal diameter of the obturator foramen of the right side and that of the left.Reliability of measurements increases if indicators of pelvic alignment are taken into account: Unfortunately the time the joint gives a good x-ray image is also the point at which nonsurgical treatment methods cease to give good results.Ĭhildren Image quality checking Image quality checking. When the infant is around 3 months old a clear roentgenographic image can be achieved.
Ultrasound imaging yields better results defining the anatomy until the cartilage is ossified. X-rays of hip dysplasia are one of the two main methods of medical imaging to diagnose hip dysplasia, the other one being medical ultrasonography.