ST. LOUIS - Minnesota Vikings defensive end Brian Robison injured his right shoulder in the first quarter against the St. Louis Rams.

The team said early in the second half he would not return.

Robison has 7 1/2 sacks after dropping Sam Bradford for an 8-yard loss on the Rams opening possession.

It was not clear how Robison was hurt during a 15-yard carry by Steven Jackson. He left the field favouring his right side.

Everson Griffen, who replaced Robison, had a 29-yard interception return for a touchdown in the Vikings' 23-point second quarter.

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