Lucia, a soccer player, is struggling to get the ball from another player. She plants one foot on the ground and rotates on it as she quickly moves to kick the ball away. She suddenly falls, grabbing her knee in pain. What most likely happened?

When Lucia planted her foot and rotated quickly, her knee may have twisted while the foot stayed fixed. This type of sudden pivoting motion commonly injures the ACL, a ligament that helps stabilize the knee. A foot fracture or ankle sprain would more likely cause pain in her foot or ankle, not primarily her knee.

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