A magnetic resonance imaging exam confirmed the initial diagnosis after Ngata was injured during the Ravens' Super Bowl victory Sunday night over the San Francisco 49ers.
Ngata isn't expected to undergo surgery and should be ready for offseason activities, as well as training camp.
This doesn't come as a surprise considering that Ngata wasn't on crutches this week after the injury and has been able to jog since the game.
Ngata made the Pro Bowl again this season after recording five sacks to tie a career-high.
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