In this health care-liability claim, a principal issue is whether a chiropractorís expert testimony was improper to establish the duty to inform. Felton sued after he suffered a stroke as Dr. Lovett manipulated Feltonís neck to relieve pain. Doctors determined the stroke resulted from a tear in a spinal artery. A jury found for Lovett on Feltonís negligence claim, but for Felton on his second claim, that Lovett failed to inform him of the risk posed by the neck manipulation. The court of appeals reversed, noting Feltonís expert, a chiropractor, testified that neck manipulations were risky only if a problem exists with the spinal artery or if the adjustment were performed improperly. In this appeal Felton argues that the appeals court relied on the chiropractorís opinion as it addressed causation, which he was not qualified by statute to give.