What Is an Anterior Cruciate Ligament (ACL) Tear?

An anterior cruciate ligament (ACL) tear is a serious injury that occurs when the ACL in the knee joint is torn. The ACL is one of the four main ligaments that provide stability to the knee and is located between the thigh bone (femur) and the shin bone (tibia). This ligament controls rotational and forward movements of the knee, ensuring joint stability. ACL tears commonly occur during sports activities involving sudden stops, pivoting, jumping, or rapid changes in direction.

The main causes of ACL tears include high-intensity sports such as football, basketball, skiing, and tennis. Sudden stops, jumps, and directional changes during these activities can place excessive stress on the ACL, leading to a tear. Additionally, direct impact or trauma can also cause an ACL injury.

Symptoms of an ACL tear include sudden and severe knee pain, a “pop” or “click” sound at the time of injury, swelling, limited range of motion, instability in the knee, and difficulty bearing weight. After the tear, the knee usually becomes swollen and painful with movement. Loss of stability may reduce athletic performance and make daily activities difficult.

Diagnosis of an ACL tear is made through physical examination, medical history, and imaging methods such as MRI. The doctor evaluates knee stability and range of motion to determine the severity of the tear. MRI helps confirm whether the ligament is torn and shows the extent of the injury.

Treatment options vary depending on the severity of the tear and the patient’s activity level. In mild or partial tears, conservative treatments such as rest, ice application, compression, and elevation (RICE protocol), along with pain relievers and anti-inflammatory medications, may be sufficient. Physical therapy aims to strengthen the muscles around the knee and improve joint mobility.

In complete tears, or for active athletes and younger patients, surgical intervention is usually recommended. Arthroscopic surgery is a minimally invasive method performed through small incisions and is used to repair or reconstruct the torn ligament. Postoperative rehabilitation is essential for strengthening the knee and restoring normal function. This process may take several months and requires a disciplined physical therapy program.

With early diagnosis and appropriate treatment, the symptoms of an ACL tear can be controlled and patients’ quality of life can be improved. Therefore, it is important to consult a specialist when knee pain or related symptoms are noticed.