Traumatic dislocation of the knee is rare, but often requires surgical intervention because complications frequently occur, including various ligamentous injuries. In this study, we report a case of knee dislocation with ligamentous injuries and injury to the popliteal artery. The patient was a 32-year-old man. He fell while bouldering and was diagnosed with dislocation of the right knee and multiple ligamentous injuries. Upon examination, we found that his right dorsal foot was numb, and the dorsal artery of the right foot was not palpable. His right leg felt cold compared to the other leg. Magnetic resonance imaging revealed injuries to the anterior cruciate ligament, posterior cruciate ligament, and lateral collateral ligament. Computed tomography revealed that the patient’s right popliteal artery was partially obstructed. We planned to reconstruct the injured ligaments. Prior to the surgery, the radiologist performed angiography, and the patient’s popliteal artery became completely obstructed during angiography; therefore, revascularization was performed immediately. Although the blood flow in the right leg recovered, it remained cold, and we did not reconstruct the ligamentous injuries. Knee dislocation requiring revascularization is quite rare. However, it causes severe dysfunction of the knee. Thus, meticulous and frequent evaluation of vascular injuries is necessary for the treatment of knee dislocation.