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There are around 200,000 ACL tears each year in the United States. ACL tears newly occur in about 69 per 100,000 per year with rates in males of 82 per 100,000 and females of 59 per 100,000. [65] When breaking down rates based on age and sex, females between the ages of 14 and 18 had the highest rates of injury with 227.6 per 100,000.
ACL reconstruction can protect the meniscus from injury, doctors say. A weak knee can also lead to another ACL tear. In fact, 11 patients (14%) in the new study re-injured their ACL.
ACL injuries can be categorized into groups- contact and non-contact based on the nature of the injury [6] Contact injuries occur when a person or object come into contact with the knee causing the ligament to tear. However, non-contact tears typically occur during the following movements: decelerating, cutting, or landing from a jump.
Most ACL tears are a result of a non-contact mechanism such as a sudden change in a direction causing the knee to rotate inward. As the knee rotates inward, additional strain is placed on the ACL, since the femur and tibia, which are the two bones that articulate together forming the knee joint, move in opposite directions, causing the ACL to tear.
Contact lenses and certain medications can also cause dry eye, she says, adding: “If you think you are experiencing dry eye, talk to your ophthalmologist about the best treatment options for you.”
An injury to the MCL may occur as an isolated injury, or it may be part of a complex injury to the knee. Other ligaments ACL, or meniscus, may be torn along with a MCL injury. Symptoms. The most common symptom following an MCL injury is pain directly over the ligament.