Table 1.

The definition of classification and number of patients classified in each category using intra-operative findings

Grade	Definition	Number of patients
KD-I	Two ligaments ruptured, one cruciate ligament and one collateral ligament, ACL/PCL + MCL/LCL/PLC	20
KD-II	Two ligaments ruptured, both cruciate ligaments, ACL + PCL	4
KD-III	Three ligaments ruptured, both cruciate ligaments, and one collateral ligament, ACL + PCL + MCL (KD-IIIM), ACL + PCL + LCL/PLC (KD-IIIL)	52
KD-IV	Both two cruciate ligaments and two collateral ligaments ruptured, ACL + PCL + MCL + LCL/PLC	0
KD-V	Any KD classifications that were accompanied by periarticular fractures or knee dislocations	21