San Francisco 49ers running back Reggie Bush has filed a lawsuit against the St. Louis Regional Convention and Stadium Authority for a season-ending knee injury sustained when he slipped on bare concrete bordering the field at the Edward Jones Dome.

The suit filed Wednesday in St. Louis Circuit Court referred to the surface as a "concrete ring of death." It maintains the stadium authority was negligent and seeks in excess of $50,000 plus unspecified punitive damages.

Bush was injured Nov. 1 when he ran out of bounds while returning a punt against the Rams. A week earlier, Browns quarterback Josh McCown slipped on the surface and banged his arm, although he stayed in the game.

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The surface was covered with blue rubber padding the remainder of the season.