Anterior cruciate ligament is one of the paired crossed ligaments inside the knee. It connects the thighbone to shinbone and provides stability against anterior translation of the knee.
Anterior cruciate ligament is commonly injured during high demand sports, like soccer, tennis, volleyball and basketball etc. It can be sprained or torn during the game. The severity of its injury is graded into 3 levels:
Grade I: Ligament is sprained and its structural integrity is preserved.
Grade II: Ligament is partially torn.
Grade III: Ligament is completely torn.
Other intra-articular knee structures, e.g. meniscus, articular cartilage and lateral collateral ligament may be injured at the same time.