Anterior cruciate ligament (ACL) rupture is one of the most feared injuries faced by the professional athlete, usually occurring with a twisting of the knee while the foot remains stationary. It is most common in sports with turns and changes of direction or in activities of contact, such as soccer, skiing or martial arts. The ACL rupture affects the kinematics of the knee producing episodes of instability that disqualify for sports level internship . Conservative treatment is a valid option in people who do not perform great activity and allows the realization of a daily life with normality. In young, active and regular athletes, surgical treatment by arthroscopic reconstruction, either with the patient's own tendons (autograft) or donor tendons (allografts), is the solution final.
 

In recent years there have been advances and improvements in the techniques of fixation of the new ligament and in the understanding of its mechanics, although the rehabilitation period is still fundamental for an early recovery. This full reincorporation to the mentioned activities and sports should not occur before six months in the best cases, time required for the new ligament to acquire the maturity and mechanical properties similar to the original one. At present, several programs of study are evaluating the application of biological therapies (growth factors, mesenchymal cells) or the suture of the patient's own ligament, with the intention of shortening recovery times, with promising preliminary results, but not applicable at present. Once the appropriate rehabilitation process has been carried out, the athlete can return to competition at the same level of intensity in more than 90% of cases.