Doctor assessing an anterior cruciate ligament injury by performing a knee stability test

ACL Tear

An ACL tear is a common knee injury involving the anterior cruciate ligament, which helps stabilize the knee joint. It often occurs during sports that involve sudden stops, jumps, or changes in direction.

Quick Facts

Symptoms

Common symptoms include:

  • A popping sound at the time of injury
  • Knee pain and swelling
  • Instability or “giving out” of the knee

ACL injuries are often confused with meniscus tears or other ligament injuries.

Causes

ACL tears typically occur due to:

  • Sudden stops or changes in direction
  • Jumping and landing improperly
  • Direct impact to the knee

Risk Factors

You may be at higher risk if you:

  • Play sports like soccer, basketball, or football
  • Have poor landing mechanics
  • Have previous knee injuries

Treatments

Treatment depends on activity level and severity.

Some patients can manage with physical therapy and bracing. Active individuals, especially athletes, often undergo surgical reconstruction followed by structured rehabilitation.

Recovery timeline for ACL tears

  • Non-surgical rehab: ~3–6 months
  • Surgical reconstruction: ~6–9 months for daily activity
  • Return to sports: often ~9–12 months depending on strength and stability

When to Seek Care

Seek medical care if you experience knee instability, swelling, or difficulty bearing weight. Specialists, such as sports medicine specialists, orthopedic surgeons, and physical therapists, may be referred to assist.

Medical Disclaimer: This content is for general educational purposes only and does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your symptoms or health concerns. If you are experiencing a medical emergency, call 911 or seek immediate care