Knee dislocation is a relatively rare and serious orthopaedic clinical injury, often combined with multiligamentous injury and vascular and neurological injury, with a high disability rate.Levy et al. found that after surgical treatment of multiligamentous knee injuries, the International Knee Documentation Committee Knee Evaluation Scale (IKDC) scores were significantly higher and more patients returned to work and sports activities than after non-surgical treatment. Efficient assessment and management of knee dislocations is essential for acute knee dislocations. Howells et al. reported that the incidence of common peroneal nerve injury due to knee dislocation ranged from 14% to 25%. Boisrenoult et al. reported that the incidence of vascular injury associated with knee dislocation ranged from 7.5% to 14%, and that delayed treatment of definite acute ischemia due to vascular injury would significantly affect the outcome, with a postoperative amputation rate of up to 10%. Nicandri et al. proposed that vascular injury in knee dislocation Treatment protocol: Seroyer et al. concluded that the principles of early management of knee dislocation are repositioning, comprehensive assessment of the vascular nerves, and immobilization of the limb to relieve pain and restore soft tissue damage. Important principles of surgical treatment are limiting the unstable structures and maximizing anatomic and biomechanical reconstruction, which requires extensive surgical experience to measure. For multi-ligament injuries, appropriate rehabilitation protocols should be developed based on injury staging. Recently, our department treated a patient with fixed knee dislocation. The patient was transferred to our hospital after being given X-rays and MRI examinations and external fixation of the branch office at a local hospital for right knee dislocation caused by a car accident. After admission, all medical and nursing staffs in the department paid sufficient attention to the patient, firstly, a comprehensive examination was performed to exclude neurovascular injury, and a clear diagnosis was made (ACL+PCL+MCL+PCL+posterior medial and lateral angle injury+LM tear+periarticular fracture+patellar dislocation and medial patellar support band rupture), and according to Schenck’s staging as KD-V4, external fixation in plaster was given to correct the joint dislocation, and the patient was instructed to The patient was given external plaster fixation to correct the dislocation, and was instructed to perform functional exercises on the affected limb. The knee dislocation was still present on the preoperative review x-ray of the affected limb, and the patient was given surgery after the skin condition and joint function improved. The detailed steps of the I-stage surgery were as follows: thorough cleaning of the joint cavity and repositioning of the knee joint – removal of the tibial plateau fracture block – fixation of the fracture block with arthroscopic sutures – removal of the N-tendon of the contralateral leg -reconstruction of the medial collateral ligament -reconstruction of the lateral collateral ligament -repositioning of the knee joint and fixation with bone round pins -adjustment of the tension of the medial collateral ligament and fixation -plaster Fixation of the knee joint. Each step was a separate surgery, and after nearly 7 hours of struggle, the initial repair of a dislocated knee was completed!