ESPNcricinfo has learned that all three ligaments in the knee - anterior cruciate ligament, posterior cruciate ligament and medial collateral ligament, which are necessary for movement and stability - have been torn in Pant's case. It is understood that in the surgery conducted recently, both the PCL and MCL were reconstructed. Pant will need to undergo another surgery to reconstruct his ACL, but the doctors will wait for at least six weeks before going ahead with it.
Source