Former NFL running back Reggie Bush, who was injured in a game when he was pushed out of bounds and slipped on an exposed concrete slab, won a $12.45 million verdict against the Los Angeles Rams.

Bush claimed in the premises liability lawsuit that the concrete slab—which his attorney described during the trial as the “concrete ring of death”—was dangerous and should have been covered by padding.

The incident took place at the Edward Jones Dome in St. Louis in November 2015, when the team was known as the...