<prompt> X-ray of which of the following would be most appropriate for determining bone age at 7 months?ShoulderMedial end of clavicleWristKnee  <response>: Ans. a Shoulder Ref OP Ghai 6thp. 6; 7thp. 4Additional Educational Points:To determine the skeletal age in: Radiograph of SHOULDER is most helpful infant between 3 and 9 months. A single film of hands and wrist adequate in children between 1 and 13 years. Film of elbow and hip Between 12 and 14 years children.Eruption of permanent teeth occurs in folowinz order First molar 6-7 yrs Central and lateral incisor 6-8 yrs Canines and premolars 9-12 yrs Second molars 12 yrs Third molars 18 yrs. 