An ACL (anterior cruciate ligament) tear is one of the most common and serious knee injuries, particularly among athletes who participate in sports that involve cutting, pivoting, jumping, and sudden changes in direction — such as soccer, basketball, football, and skiing.
Dr. Joe Cooper, a board-certified and fellowship-trained orthopedic surgeon serving Beverly Hills, Los Angeles, and Brentwood, has extensive experience diagnosing and treating ACL tears in athletes of all levels, from high school competitors to professional and Olympic athletes.
What Is the ACL?
The anterior cruciate ligament is one of four major ligaments in the knee. It runs diagonally through the middle of the joint and is essential for rotational stability and controlling forward movement of the shin bone (tibia) relative to the thigh bone (femur). When torn, the knee often becomes unstable, making it difficult to perform activities that require pivoting or sudden direction changes.
Signs and Symptoms of an ACL Tear
- A loud "pop" at the time of injury
- Immediate and significant swelling of the knee
- Severe pain and inability to continue activity
- A feeling of instability or the knee "giving way"
- Loss of full range of motion
Diagnosis
Dr. Cooper conducts a thorough clinical examination and orders appropriate imaging — typically an MRI — to confirm the diagnosis and assess for any associated injuries to the meniscus, cartilage, or other ligaments, which frequently occur alongside ACL tears.
Treatment Options
Not every ACL tear requires surgery. Treatment depends on factors including the severity of the tear, the patient's activity level, age, and overall goals. Options include:
- Conservative management: Physical therapy, bracing, and activity modification for partial tears or less active patients
- ACL reconstruction surgery: The gold standard for active patients, athletes, and those with complete tears. Dr. Cooper uses proven graft options (patellar tendon, hamstring, or allograft) and advanced arthroscopic techniques to restore stability and function.
Get Expert Care in Los Angeles
If you've suffered a knee injury and suspect an ACL tear, prompt evaluation is key. Contact Dr. Cooper's office in Beverly Hills or Brentwood to schedule a consultation and get back on the path to recovery.








