Her agency Core Contents Media stated that Jiyeon injured her knee during dance practice and went to the hospital after filming for the music show. As she was in pain, her members chose to sit down for their pre-recorded performance and wrap up filming. 

At the hospital, the T-ara maknae was diagnosed with knee synovitis, an inflammation of the joints, and received a treatment of ice cold water and a ligament strengthening injection. Afterwards, Jiyeon went back to the broadcast studio for T-ara's live performance of "Number 9".

T-ara will be adjusting the "Number 9" choreography on music shows this week. Check out the girls' latest performance on 'M! Countdown' here if you missed it.

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Hopefully, Jiyeon will get better soon!