... 67, 117 P.3d 786 (2005); see also ARS § 23-1021(A) (Supp.2006). Medical causation is
established by showing that the accident caused the injury. Grammatico, 211 Ariz. at 71, ¶
20, 117 P.3d at 790; DeSchaaf, 141 Ariz. at 320, 686 P.2d at 1290. ...