The anterior cruciate ligament (ACL) is a crucial ligament that stabilizes the knee joint. It links the thighbone (femur) to the shinbone (tibia).
The ACL helps control the back-and-forth motion of the knee and prevents the tibia from sliding out in front of the femur. Injuries to the ACL, such as tears, often occur during activities that involve sudden stops, jumps, or changes in direction, which are common in sports like basketball, soccer, tennis, and volleyball.
An ACL injury can occur due to several reasons:
Sports like basketball, football, soccer, and skiing are commonly associated with ACL tears. These injuries often occur alongside other injuries, such as tears to the medial collateral ligament (MCL) and the meniscus, the shock-absorbing cartilage in the knee.
Most ACL tears happen in the middle of the ligament or result in the ligament being pulled off the thigh bone. These injuries create a gap between the torn edges and do not heal on their own.
Early symptoms of an ACL injury include:
In cases of mild injury, the knee may feel unstable or seem to “give way” when in use.
Use proper techniques when playing sports or exercising. Some college sports programs educate athletes on how to minimize stress on the ACL through specific warm-up exercises and jumping drills. These jumping and landing exercises have been demonstrated to reduce the incidence of ACL injuries.
The use of knee braces during intense athletic activities, such as football, is controversial. While knee braces have not been proven to reduce the overall number of knee injuries, their effectiveness in preventing ACL injuries specifically remains unsubstantiated.