Ralph Macchio Suffering from a Ruptured Cyst

Ralph Macchio and Karina Smirnoff

Bob D'Amico/ABC

updated 05/09/2011 AT 1:00 PM ET

originally published 05/09/2011 AT 1:50 PM ET

Will Ralph Macchio be able to perform on Dancing with the Stars Monday night?

“Have missed days of rehearsal this week,” Macchio, 49, posted on his Twitter account Monday. “Had a ruptured cyst on the back of my knee causing acute pain. Hoping to be able to perform tonight!”

Macchio and partner Karina Smirnoff are one of five couples remaining in the competition. Each couple is expected to perform two routines Monday.

All season long, Macchio has dealt with the aches and pains associated with Dancing’s long hours of training. This time he has Baker s cyst, which is a buildup of fluid behind the knee.

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