The most common cause of anterior cruciate ligament rupture is a brusque or uncontrolled twisting of the knee. The foot remains pinned to the ground while the athlete’s body keeps twisting excessively. The ligament cannot resist this excessive traction and ends up rupturing. If the twisting is too brusque or there are other movements involved, not only the anterior cruciate ligament can rupture, but other structures of the knee as well (meniscus, cartilage, lateral ligaments,….)
Approximately half of all ligament injuries involve damage to other knee structures such as the articular cartilage, the meniscus, lateral ligaments… The most severe injuries, such as an O’Donoghue triad, include ACL rupture, rupture of the internal meniscus and sprain or rupture of the internal lateral ligament. In injuries suffered while practicing sports such as skiing, a simultaneous rupture of the posterior cruciate ligament can occur as well, causing a knee dislocation, which is a far more serious injury.
Fortunately, the most common sports injury is an isolated anterior cruciate ligament rupture or associated with a rupture of the meniscus.