The primary role of Anterior Cruciate Ligament (ACL) is to resist to anterior translation of the tibia on the femur. Its secondary role is to stabilize the knee in order to be able to resist excessive varus and valgus stress, hyperextension of the knee and also to facilitate proprioception. ACL is the most commonly injured ligament in the knee. If patients are unable to continue with sports and regular daily activities due to knee instability, reconstruction surgery is proposed. There are a wide variety of grafts used for ACL reconstruction. Artificial materials have been historically shown not to be the appropriate solution for ACL reconstruction. Grafts of human origin are referred to as autografts when created from the patient’s own tissues and allografts when harvested from a separate human donor. Grafts can be further categorized according to the tissue from which they are derived. There are tendon grafts (such as hamstrings tendons or iliotibial bands), bone-tendon grafts (such as quadriceps tendon or Achilles tendon) and bone-tendon-bone grafts (such as patellar bone, patellar ligament, tibial tuberosity bone graft). All of these grafts can be fixed within the knee by numerous different systems depending on different grafts and surgeon’s preferences. This thesis will present an overview of the graft types and techniques currently in use for ACL reconstruction.