
ACL Injury
Top Orthopedic Knee Surgeons in Orange County
What is an ACL Injury?
The anterior cruciate ligament (ACL) is one of four major ligaments in the knee joint. It helps maintain the knee’s rotational stability and prevents the tibia (shinbone) from slipping in front of the femur (thighbone). An ACL injury is either a tear or sprain. An ACL tear can be either a complete tear or partial tear. ACL injuries occur when the knee is hyperextended. These are common among athletes whose sports involve sudden changes in direction, pivoting, jumping, and landing. Such physical activities commonly include soccer, basketball, football, and downhill skiing. Severe ACL tears generally require surgery to repair.
What’s the difference between an ACL Sprain and an ACL Tear?
An ACL sprain occurs when excessive force or a sudden movement causes the fibers or threads of the ligament to stretch, partially tear or in severe cases, completely rupture. ACL sprains are painful and graded on their severity with grades 1-3. A grade 1 sprain is the least severe, while a grade 3 is a complete rupture.
An ACL tear is when the anterior cruciate ligament is torn, either partial or a full tear. With an ACL tear you will feel severe pain, frequent popping noise, loss of range of motion in the affected knee followed by the sudden onset of swelling. As swelling progresses, it may become more difficult to bend or straighten the knee or place any weight on the affected leg so their leg doesn’t give way. Once you sustain an ACL tear, it’s important to administer prompt first-aid care to reduce acute pain and swelling. You should see an orthopedic knee surgeon right way, but in the meantime, make sure you practice the “RICE” method as soon as possible: rest, ice, compression, and elevation.
Diagnosis
A clinical exam involving moving the knee in a variety of positions to assess range of motion and overall function of the knee joint will be performed by your knee surgeon. They will also check your knee for swelling and tenderness – comparing it to your non-injured knee. Your doctor may also order imaging tests like X-rays, MRI and ultrasound imaging to rule out other causes, such as a meniscus tear and to determine the severity of the injury.
Treatment Options for ACL Tears
Surgery is not necessary for all patients. A young athlete will most likely require surgery to safely return to sports. However, a less active, older patient may be able to return to a quieter lifestyle without surgery.
Nonsurgical Treatments for ACL Tears
- Bracing: A brace can protect your knee from instability. You may be given crutches to keep from putting your full weight on your injured leg.
- Physical therapy: Specific exercises can help to restore function to your knee and strengthen the muscles that support it. However, PT can only begin once swelling has gone down.
ACL Reconstruction Surgery
To surgically repair the ACL and restore function to the knee joint, the ligament must be reconstructed. Your knee surgeon will replace your torn ligament with a tissue graft taken from another part of your knee or from a cadaver. This graft acts as a scaffolding for a new ligament to grow on.
ACL reconstruction surgery is generally scheduled three to six weeks after the injury occurs to ensure swelling and inflammation have subsided. ACL reconstruction is a minimally invasive procedure outpatient procedure that is done arthroscopically.
Recovery from ACL Surgery
During recovery, physical therapy is necessary to improve range of motion, gait, and function. It usually takes six to nine months for a patient to return to participating in sports after ACL reconstruction, depending on the type of activity. Make sure you discuss when you can return to your sports and activities with your orthopedic knee surgeon.
Trust the Knee Surgeons at Newport Orthopedic Institute
Our board-certified, fellowship-trained Orange County knee surgeons are skilled at treating ACL injuries. Your knee surgeon will create a custom treatment plan to help you get back to doing the activities you enjoy.
Do you have an ACL injury in Orange County?
Call Newport Orthopedic Institute at (949) 722-7038.
Find a Knee Surgeon

Where we provide ACL Injury Services
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Hoag Orthopedic Institute Hospitals & Surgery Centers 16250 Sand Canyon Ave.
Irvine, CA 92618View Location -
Hoag Orthopedic Institute Surgery Center - Newport Beach Hospitals & Surgery Centers 22 Corporate Plaza, Suite 150
Newport Beach, CA 92660View Location -
Newport Orthopedic Institute - Huntington Beach Orthopedics Physician Offices 19582 Beach Boulevard, Suite 306
Huntington Beach, CA 92648View Location -
Newport Orthopedic Institute - Irvine Orthopedics Physician Offices 16300 Sand Canyon Ave, Suite 400
Irvine, CA 92618View Location -
Newport Orthopedic Institute - Newport Beach Orthopedics Physician Offices 22 Corporate Plaza Drive
Newport Beach, CA 92660View Location
Stories about our ACL Injury Services
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- Knee
Knee Scope With Reconstruction
Provider: David S Gazzaniga MD“Dr was very confident about his skills. The team didn't seem to be consistent with in information especially on the DME usage and or post op instructions” -
- Knee
Knee Scope Without Reconstruction
Provider: Alan H Beyer MD“Everything from Staff to the doctor himself, the ease of moving in and out of the hospital and the kindnesses of staff from the scheduler through to the nurses.” -
- Knee
Total Knee Replacement
Provider: James T Caillouette MD“Everything is explained well, options are gone over thoroughly. All the staff is very knowledgeable. Dr. Caillouette and Cara PA are patient and answers all questions - Cara is very friendly too!” -
- Knee
Knee Scope Without Reconstruction
Provider: Alan H Beyer MD“Dr. Beyer is an excellent surgeon. Terrific staff that follows up and answers your questions.” -
- Knee
Knee Scope With Reconstruction
Provider: David S Gazzaniga MD“The office staff was great.” -
- Knee
Total Knee Replacement
Provider: Nader A Nassif MD“This is my second surgery with Dr. Nassif. He is through, friendly, answers all questions and both my hip & knee are great!”
Related Videos
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ACL Reconstruction (Hamstring Graft Method)Watch Video
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Anterior Cruciate Ligament (ACL) Injuries in WomenWatch Video
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Anterior Cruciate Ligament Tear (ACL Tear)Watch Video
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Arthroscopy (Overview)Watch Video
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Avascular Necrosis (Osteonecrosis) of the KneeWatch Video
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Baker's CystWatch Video
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Bursitis of the Knee (Pes Anserine Bursitis)Watch Video
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Dr. Caillouette - Channel 6 NewsWatch Video
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Dr. Siljander - KneeWatch Video
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Fluoroscopic Guided Steroid Injection for Knee PainWatch Video
Blogs about ACL Injury
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9 Exercises We Modified to Help You Avoid Knee Pain
Do you experience knee pain that makes working out difficult? We've had our top sports medicine doctors weigh-in to provide some great tips and ...
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Dr. Nassif Elected New Division Chief of Joint Replacement at HOI
Nader Nassif, M.D., a board-certified orthopedic surgeon at Newport Orthopedic Institute, has been elected as the new Division Chief of Joint ...
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PA Spotlight: Drew Haliber
Drew is a Physician Assistant for Dr. Nader Nassif and specializes on treating patients with hip and knee osteoarthritis as well as common knee ...
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PA Spotlight: Dave Colliflower
Dave Colliflower is primarily a Physician Assistant for Dr. Alan H. Beyer, but also assists Dr. Dunphy with outpatient surgical cases. Dave has been ...
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Intra Articular Joint Program At NOI
Arthritis is the most common cause of chronic knee pain and disability. Degenerative, or Osteoarthritis (OA) is one of the most common forms of this ...
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Dr. Beyer - American Health Journal - Partial Knee Replacement
Dr. Beyer appears on American Health Journal and discusses partial knee replacement.
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