The causes of ACL injury have recently been the focus of research. Factors contributing to ACL injuries include ground hardness, grass type and cleat type. But one of the other major findings is that women are nearly three times more likely to have ACL injuries than men. And some statistics says that a female soccer player is eight times more likely to injury her ACL than a male soccer player.Researchers believe this may be due to differences in hormone levels on ligament strength and stiffness, neuromuscular control, lower limb biomechanics, ligament strength and fatigue. Findings have show a difference in neuromuscular control in women when landing jumps (women appear to have less hip and knee flexion than men).