Direct Impact : A direct blow to the knee, such as from the car's dashboard in a frontal collision, can cause the knee to move beyond its normal range of moƟon and strain or tear the ACL. TwisƟng or RotaƟon : The knee might get twisted during the impact, especially if the foot is planted on the floorboard, leading to an ACL injury. Hyperextension: The knee could be forced into a straightened posiƟon beyond its normal range, potenƟally damaging the ACL. Sudden DeceleraƟon: The rapid deceleraƟon experienced during a crash can cause the body to move forward while the foot remains staƟonary, puƫng strain on the knee and potenƟally injuring the ACL. Symptoms and Effects of an ACL Injury: Immediate Pain: A sharp, intense pain will oŌen be felt in the knee immediately aŌer the injury. Popping Sound: Some people report hearing or feeling a pop in their knee at the Ɵme of the injury. Swelling: The knee will usually swell within a few hours of the injury. Loss of MoƟon: There can be a reduced range of moƟon in the knee, and straightening the knee might be painful or impossible. Instability: The knee might feel unstable or like it's giving out when trying to stand or walk. Signs to IdenƟfy an ACL Injury: Physical ExaminaƟon: A doctor will check for swelling and tenderness. They'll also move the knee into various posiƟons to assess the damage to the ACL.
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