LARS (Ligament Advanced Reinforcement System) is a synthetic ligament reinforcement and reconstruction device invented by Prof. JPLaboureau in France. It can be used for anterior and posterior cruciate ligament reconstruction in the knee joint, and ligament repair in the ankle and shoulder joint. The internal structure is similar to the normal ligament fiber structure of the human body. The longitudinal fibers inside the joint are elastic but will not be stretched and have strong fatigue resistance and allow human cells to grow in, thus achieving the purpose of repair and reconstruction. The material is polyethylene terephthalate, a unique structure that prevents inter-fiber friction from generating debris particles that can cause synovitis. With 15 years of use in Europe, tens of thousands of patients have reported no synovitis. The LARS artificial ligament for ligament injuries advocates and adheres to the concept of internal fixation of soft tissues. The concept of internal fixation of fractures has penetrated the hearts of orthopaedic surgeons, while the concept of soft tissue internal fixation is still relatively new to many surgeons. In particular, the classical knee cruciate ligament reconstruction procedures that are now popular do not advocate acute reconstruction, but rather subacute or late reconstruction, requiring intercondylar fossa clearance regardless of the application of autologous or allogeneic tendon reconstruction. This way the stump of the ligament rich in blood flow and proprioceptive nerves is removed, the reconstructed ligament is slow to heal, revascularization takes more than a year, and improper exercise and protection during the healing process can lead to ligament loosening or rupture.LARS artificial ligament for anterior cruciate ligament injury of the knee advocates strengthening the reconstruction in the acute phase, preserving the stump of the ligament, and the artificial ligament is passed through the stump. For acute injuries of the posterior cruciate ligament, because the posterior cruciate ligament has rich blood flow and strong healing ability, the purpose of artificial ligament strengthening reconstruction is to maintain the normal anatomical position of the joint, to make the ligament severed ends fit together, and to promote its self-healing. For subacute or chronic injuries without good stumps, hollow artificial ligaments and autologous tendons can be used for reconstruction to prevent loosening and rupture of the tendon during the vascularization process. Preferred indications for LARS ligaments: 1. Acute injuries, (less than 3 weeks), especially in young patients who need to resume exercise as soon as possible. 2, subacute or chronic injury, with good stumps. 3, elderly patients, want to recover as soon as possible. 4.Professional sports athletes. 5.Knee dislocation with multiple ligament injuries. 6, autologous or allogeneic material transplantation failure. 7, subacute or chronic injury without good stump, can apply hollow artificial ligament and autologous tendon reconstruction.