San Antonio Orthopaedic Specialists - Hip, Knee, & Shoulder Orthopedic Doctors

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What Is An ACL Injury?

An ACL injury (anterior cruciate ligament injury) is a common knee injury that can occur during activities involving sudden changes in direction or pivoting motion. These activities can include sports such as football, basketball, and soccer. The injury occurs due to overstretching or tearing of the ligament beyond its normal range of motion.

Causes of ACL Injuries

ACL injuries can be caused by various factors, including:

  1. Sudden Stops or Pivots: Rapid deceleration or pivoting movements can put significant stress on the ACL, increasing the risk of injury.

  2. Direct Impact: A direct blow to the knee, like those encountered during collisions or tackles in sports such as football, can result in ACL tears or strains.

  3. Improper Landing Techniques: Landing incorrectly from a jump or landing on a bent knee can place excessive strain on the ACL, leading to injury.

Recognizing ACL Injury Symptoms

It's important to recognize ACL injury symptoms and seek timely medical attention. Common symptoms include:

  1. Popping Sensation: Many patients report hearing or feeling a "popping" sound or sensation at the time of injury.

  2. Severe Pain and Swelling: The knee may experience immediate pain and swelling due to the injury.

  3. Instability and Giving Way: ACL injuries can cause instability or giving way in the knee, making it difficult to bear weight or engage in physical activities.

  4. Limited Range of Motion: Patients may experience difficulty fully extending or flexing the knee joint.

Treatment Options for ACL Injuries

A patient's treatment for an ACL injury depends on a variety of factors, such as the severity of the injury, his or her lifestyle, and personal preferences. Common treatment options include:

  1. Non-Surgical Approaches: Mild ACL injuries can often be managed with non-surgical methods such as physical therapy, bracing, and activity modification.

  2. Surgical Intervention: Severe ACL tears may require surgical intervention, such as ACL reconstruction surgery. During this procedure, the torn ligament is replaced with a graft to restore knee stability.

Rehabilitation and Recovery

Rehabilitation is an integral part of recovering from an ACL injury. Physical therapy is commonly recommended to strengthen the knee, improve range of motion, and restore stability. The rehabilitation program is tailored to each individual's needs and gradually progresses to help patients regain their pre-injury activity level.

Preventing ACL Injuries

While ACL injuries cannot be entirely prevented, there are steps you can take to reduce the risk:

  1. Conditioning and Strengthening Exercises: Engaging in exercises that focus on strengthening the muscles around the knee joint can help provide better support and stability.

  2. Proper Technique: Using correct landing and pivoting techniques during physical activities can help minimize the risk of ACL injuries.

  3. Protective Gear: Wearing appropriate protective gear, such as knee braces, can provide an extra layer of support and potentially reduce the risk of injury.

It can be challenging to recover from ACL injuries, but patients can return to their desired level of activity with the right understanding, timely treatment, and rehabilitation. If you suspect an ACL injury, we urge you to consult an orthopedic specialist at San Antonio Orthopedic Specialists for an accurate diagnosis and personalized treatment plan.


Have any questions or need further advice on proper form and safety tips? Schedule an appointment with our Sports Medicine Physician here in San Antonio, Dr. Marx!