There's a new twist in the race for the mirrorball on Dancing With the Stars. E! News has confirmed Lindsay Arnold injured her knee during rehearsal on Sunday, Nov. 12.

"I was practicing the pro number and I literally just stepped up onto a stair and it felt like my whole leg gave out and stopped working," Lindsay said in a video on People.

Arnold is competing with Hamilton star Jordan Fisher and the two are now in the semifinals. They received two perfect scores during the Monday, Nov. 6 show.

"We're both insanely grateful and excited to keep the momentum going and build off of tonight, which has been an amazing night, one I will never forget," Jordan told E! News after their big night.

"Do what we've been doing. Every single week it's kind of like, we feel the pressure…This guy is incredible and every week people expect more and more and more and it's always scary and there's always the pressure to get better and better," Lindsay told us about topping their double perfect scores. "By trusting each other and going for the crazy things that happen in my head…that's how we're able to succeed. It's just going for it and stepping outside of the box."

Now all that may be in jeopardy, depending on her injury. Fellow Dancing With the Stars pros have been standing in for Lindsay in rehearsals. Jordan and Lindsay also received a perfect score for their Halloween dance and during Disney night, making them one of the top couples to beat in the competition.

Injuries are common during Dancing With the Stars. Earlier this season Drew Scott suffered a hamstring injury and Lindsey Stirling injured her ribs. Both went on to dance. Find out who else has struggled during the competition below.

Maksim Chmerkovskiy, Heather Morris, DWTS, Dancing With the Stars

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Dancing With the Stars, Jana Kramer

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Sharna Burgess, Bonner Bolton, Dancing With the Stars

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Jodie Sweetin, Dancing With the Stars, DWTS

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Ginger Zee

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Amy Purdy, Derek Hough, Dancing with the Stars

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Candace Cameron Bure, Mark Ballas

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DOROTHY HAMILL, TRISTAN MACMANUS, DWTS

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DANCING WITH THE STARS

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Danica McKellar, Dancing with the Stars

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Dancing With The Stars, DWTS, Season 17, BILL NYE & TYNE STECKLEIN

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DWTS, Jacoby Jones, Karina Smirnoff

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Melissa Rycroft, Tony Dovolani, Dancing with the Stars All-Star

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Dancing with the Stars, DWTS Season 14, MELISSA GILBERT & MAKSIM CHMERKOVSKIY

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Dancing with the Stars, DWTS Season 14, MARIA MENOUNOS & DEREK HOUGH

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Ralph Macchio, Karina Sminoff, DWTS

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DWTS, Kym Johnson, Hines Ward

DWTS, Evan Lysacek, Anna Trebunskaya

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DWTS, Jennifer Grey, Derek Hough

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Ty Murray, Chelsie Hightower

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Debi Mazar, Twitter

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DWTS, Kathy Ireland, Tony Dovolani, Injury

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Tony Dovolani, Melissa Rycroft, Dancing with the Stars

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Jewel, Ty Murray

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Gilles Marini, Twitter

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Misty May-Treanor, Dancing with the Stars

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DWTS, Lacey Schwimmer, Steve-O

ABC/KELSEY MCNEAL

Cristian De La Fuente

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Dancing With the Stars airs Mondays, 8 p.m. on ABC.

Don't miss E! News every Tuesday to Saturday at 6pm.

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