Campbell was injured when his leg buckled beneath him as he helped bring down Frank Gore on a 1-yard gain late in Sunday's game.
A large group of players from both teams knelt down around him on the 25-yard line as Campbell was attended to with 4:56 remaining and Arizona trailing the 49ers 29-20. Former Cardinals wideout Anquan Boldin put his arm around a member of Arizona's medical staff.
A star member of the Arizona's stingy, much-improved defense, Campbell had four tackles and a half-sack Sunday.
AP NFL website: www.pro32.ap.org
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