<prompt> For age determination of 21 year old female , site for X-ray doneElbow and shoulderWristHip and kneeIliac crest and clavicle  <response>: D i.e. Iliac crest clavicle The following data is used for radiologically age determination. Region selected for X Ray Age Girls Boys ElbowQ 13 -14 15 -17 WristQ 16 - 17 18 - 19 Shoulder 17-18 19-20 Crest of IliumQ 18 -19 20 - 21 Ischial Tuberosity 21 - 220 23 - 24Q Inner end of clavicle Way of remembering : By radiological examination of wrist we can determine age of 16, 17, 18, 19; From shoulder 17, 18, 19, 20 from crest of ilium examination 18, 19, 20, 21. These all are 4 continuous numbers staing from 16 from wrist, 17 for shoulder 18 for crest of ilium. Also remember that Pt two years are for girls last two for boys. Radiological examination of elbow is done for age determination before this i.e. 13 - 16 yrs. R.E. of Ischial tuberosity Clavicle inner end is done for 21, 22, 23, 24 age group Ist 2 years for girls last 2 years for boys. 