The knee joint is the largest and most structurally complex joint in the human body. The knee ligament is an important structure for the stability of the knee joint and is also a site of multiple pathologies. The knee joint consists of the distal femur, proximal tibia and patella. The ligaments, joint capsule and meniscus attached to them form the stable structure of the joint. The anterior cruciate ligament begins on the medial aspect of the femoral epicondyle and ends on the anterolateral aspect of the medial tibial tuberosity, limiting the anterior displacement and rotation of the tibia. The posterior cruciate ligament begins on the lateral aspect of the medial femoral condyle and ends at the posterior edge of the tibial plateau, just below the level of the joint, limiting the posterior displacement of the tibia. They are important intra-articular structures that maintain the stability of the knee joint. The meniscus, or semilunar cartilage, is a C-shaped disc of fibrocartilage within the knee joint that absorbs impingement, increases joint surface adaptation, increases joint stability, and helps to distribute joint fluid evenly. The medial collateral ligament of the knee, also known as the tibial collateral ligament, begins at the medial epicondyle of the femur and ends at the medial epicondyle of the tibia, and is often more susceptible to injury than other ligaments during daily exercise and life.