Dr Micky Collins, executive director at University of Pittsburgh Medical Centre (UPMC): “There is clearly something wrong but we don’t know if concussion is the only variable in some of the scary things we are seeing.”  Photograph: by Piaras Ó Mídheach/Sportsfile

A fundamental disagreement in how brain injuries should be treated exists between leading US experts and what was agreed at last year’s international (...)

Ireland’s Jonny Sexton is tackled and injured by France’s Louis Picamoles during the recent match at the Millennium Stadium. The physical attrition in rugby is considerable. Photo: David Davies/PA

By now the GAA is quite practised at coping with big international sporting events involving Irish teams but there was still some apprehension in Crok(...)