CHICAGO — A judge refused Thursday to toss out a jury verdict that suggested Chicago police adhere to a code of silence in protecting rogue officers, citing its ‘‘social value’’ despite allegations by the city that the verdict could cost Chicago millions in other litigation.

The ruling involves the case of Karolina Obrycka, a local bartender who was attacked by a drunk off-duty police officer as she worked in 2007. Obrycka sued the city after the beating, which was caught on video and went viral online, and a jury ruled in her favor last month.