Editor,—Further to Foëx's historical note on the intraosseous route for fluid administration¹ and Lavis's recommendations regarding its use in extreme circumstances in adults,² we would like to mention our previously reported experience where use of an intracalcaneal infusion proved very successful in the resuscitation of a seriously ill child.³ In our opinion, this case questions the assumption that it is necessary to have a functioning medullary cavity in the bone where an intraosseous needle is used. Could it just be that a bone …