The word ‘sole’ can mean many, a divided 1st District Appellate Court found in reversing a lower court’s order to grant a paralyzed jockey a new trial.The negligence lawsuit in this case involved jockey Rene Douglas, who sued Arlington Park Racecourse after he became paralyzed after falling off his horse at the track in 2009.After a trial in Cook County Circuit Court, a jury ruled in favor of the racecourse, which claimed two alternative proximate causes of the jockey’s injury: the manufacturer of …