Viewers weren't the only ones injured watching Shannen Doherty attempt to shake her booty on "Dancing with the Stars" ... just take a look at her partner Mark Ballas on crutches.

With Shannen and DWTS judge Carrie Ann Inaba at his side, Mark limped through NYC after appearing on "Live with Regis & Kelly" on Thursday.

Mark's busted knee will keep him out of commission for at least six weeks.

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