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An ACL injury occurs when the anterior cruciate ligament becomes damaged through either a pull, twist, tear or other disruption of the knee. An injured ACL reduces stability in the knee and decreases support of the knee joint during athletic activity.
Injuries can vary in severity, ranging from a minor sprain to a complete tear or rupture of the ligament.
Injuries usually occur during an activity where the knee is forced side-to-side or unnaturally twisted.
Less serious injuries are frequently treatable with physical therapy alone, although a torn ligament will usually require surgery (a completely torn ligament cannot repair or reattach itself).
ACL surgery typically utilizes part of the patient's own patellar tendon to rebuild the injured ligament.
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