The posterior cruciate ligament (PCL) is an important factor in stabilizing the knee joint and is the strongest ligament in the knee joint, guiding and limiting knee motion. PCL injuries are often seen in two situations, one is a high-energy injury, common in traffic accidents, high falls, etc. This situation is often combined with injuries to the anterior, medial, lateral and other structures of the knee, so it is often a compound ligament injury; and the other is a sports injury, this is a low-energy injury, athletes are mostly isolated PCL injury, the former often left knee instability, seriously affecting the patient walking function The former often leaves the knee unstable and seriously affects the patient’s walking function, often requiring surgical treatment. Patients with the latter low-energy PCL injuries, often with less than 2 degrees of posterior laxity of the knee, can often be treated conservatively with more satisfactory results, but if the degree of injury is more severe, more than 3 degrees of posterior laxity, should also be actively surgical treatment. Questions related to posterior cruciate ligament injury 1. How to determine whether the posterior cruciate ligament is injured? Patients with acute posterior cruciate ligament injuries can clearly feel a transient sensation of dislocation or misalignment of the knee at the moment of injury. After the injury, there is obvious pain and swelling when the knee joint is moved. Patients with chronic posterior cruciate ligament injuries have a sensation of knee weakness, pain, difficulty in walking up and down stairs, and inability to use force. Patients with multiple ligament injuries, such as lateral collateral ligament injuries, may experience severe claudication and difficulty walking. The doctor’s physical examination can often find a positive knee posterior drawer test, posterior drawer test is the most sensitive test for posterior cruciate ligament injury, magnetic resonance (MR) of the knee is a huge help for a clear diagnosis. 2. Do posterior cruciate ligament injuries require surgery? Low energy simple posterior cruciate ligament acute injury (2 degrees or less), you can first knee brace strict conservative treatment for 3 months, is expected to obtain good results, 2 ~ 3 degrees of serious posterior cruciate ligament injury should be considered early arthroscopic minimally invasive surgery treatment. 3. What happens if the prognosis for posterior cruciate ligament injury is poor? Long-term posterior instability of the knee joint will cause wear and tear of the patellofemoral joint and secondary meniscal damage, leading to osteoarthritis of the knee joint, which will seriously affect the function of the knee joint. 4. What is the surgical method? For simple posterior cruciate ligament injuries, the main surgical option is to perform arthroscopic reconstruction of the posterior cruciate ligament, while for patients with compound ligament injuries combined with other ligament injuries, the posterior cruciate ligament should be repaired and reconstructed at the same time as other related ligaments, as appropriate. For particularly severe patients, even bone orthopedic surgery is required to correct the force lines of the lower extremity. 5.Is it better to have autologous or allogeneic grafts or artificial ligaments? For posterior cruciate ligament reconstruction surgery, the graft can be autologous, allograft or artificial ligament. Autologous ligament reconstruction is more economical, but it needs to destroy some normal secondary ligaments, while allograft ligaments do not need to damage their own ligaments, but they are more expensive and may have rejection reactions in rare cases. Artificial ligaments are stronger and have a faster recovery time, but are more expensive. In conclusion, each of the 3 types of grafts has its own advantages and disadvantages, and patients and doctors can choose grafts according to their specific conditions. 6.What is the length of hospitalization and recovery time for surgery? Posterior cruciate ligament reconstruction surgery usually requires about 1 week of hospitalization and systematic functional rehabilitation exercises under the guidance of a physician after surgery. Patients with simple posterior cruciate ligament injury need to be in abduction within 2 months, and it takes about 3 months to resume daily life and often 10-12 months to resume sports. 7.What is the cost of posterior cruciate ligament reconstruction surgery? Usually the cost of reconstructive surgery using autologous material is about 30,000 RMB, while the cost of multiple ligament injuries or the use of allogeneic or artificial materials varies according to the specific circumstances of the injury. 8.How do I recover after posterior cruciate ligament reconstruction? The postoperative rehabilitation of patients with posterior cruciate ligament or multiple ligament injuries is very important, and a good surgery + good functional exercise is necessary to have good results. Postoperative patients are guided by doctors to perform functional rehabilitation exercises during the hospital, and exercise at home after discharge. Patients with posterior cruciate ligament and multiple ligament injuries sometimes have postoperative knee stiffness, etc. If it is more difficult to recover on your own, you need to keep close contact with your physician in time. 9.What is the overall outcome of posterior cruciate ligament injury? According to international and domestic literature, the functional score after treatment of simple mild posterior cruciate ligament injury is about 80-85% of normal knee, and the function of knee joint of patients with multiple ligament injuries and other compound injuries is 70-85% of normal. The posterior cruciate ligament is the thickest and strongest ligament structure in the knee joint and has a large impact on knee function after injury. Prompt and correct diagnosis and treatment after injury is the basis for a good outcome. Good postoperative rehabilitation is an important part of the overall treatment. The treatment of posterior cruciate ligament injuries is often a systematic project.