<prompt> Most common cause of genu valgum in children is -OsteoarthritisRicketsPagers diseaseRheumatoid arthritis  <response>: Commonest type of genu valgum is idiopathic.Amongst the given options, most common cause of genu valgum in children is rickets.Pagets disease causes genu varum. OA and RA are not seen in children. 