Cranial Cruciate Ligament (CCL) Injury and TPLO Surgery in Dogs
A cranial cruciate ligament (CCL) tear is one of the most common causes of hind-leg lameness in dogs. If your dog is limping, hesitant to jump, or struggling with stairs, a cruciate injury may be the cause.
Understanding the condition—and the available treatment options—can help you make confident decisions for your pet.
What Is the Cranial Cruciate Ligament?
The cranial cruciate ligament (CCL) is one of the primary stabilizers of the knee joint. It connects the femur (thigh bone) to the tibia (shin bone) and prevents abnormal forward movement and rotation of the joint.
In people, this ligament is called the ACL. In dogs, CCL injury is extremely common and often leads to pain, instability, and progressive arthritis if left untreated.
How Do CCL Injuries Occur?
Some injuries happen suddenly during activity. However, many cruciate tears develop gradually due to ligament degeneration over time.
Certain breeds may be predisposed, and excess body weight increases stress on the knee joint. In many cases, the opposite knee may eventually be affected as well.
When the ligament tears, instability within the joint can also damage the meniscus—a cartilage structure that cushions the knee—leading to additional pain.
Signs of a Cruciate Ligament Tear
Common symptoms include:
• Limping or favoring one hind leg
• Difficulty rising or sitting
• Reluctance to run or jump
• Trouble climbing stairs
• Stiffness after activity
• A “clicking” sound from the knee in some cases
Symptoms may appear suddenly or develop gradually.
How Is a CCL Injury Diagnosed?
An experienced veterinary surgeon can often diagnose a cruciate tear through physical examination of the knee joint.
X-rays are used to evaluate joint swelling and arthritis, though the ligament itself does not appear on radiographs. In some cases, advanced imaging or arthroscopy may be recommended.
The meniscus is evaluated during surgery if damage is suspected.
Treatment Options for Cruciate Ligament Injury
Conservative (Non-Surgical) Management
In smaller or less active dogs, medical management may be considered. This can include:
• Weight management
• Anti-inflammatory medication
• Activity modification
• Joint supplements
However, because instability remains, arthritis typically progresses over time without surgical stabilization.
Surgical Treatment
More than 100 surgical techniques have been described to treat CCL injuries. Today, procedures generally fall into two categories:
Ligament Replacement Techniques
These procedures attempt to mimic the function of the damaged ligament using synthetic materials. While sometimes appropriate for small or low-activity dogs, they do not change the underlying mechanics of the knee.
TPLO (Tibial Plateau Leveling Osteotomy)
TPLO is the most commonly performed surgical treatment for CCL tears in medium- to large-breed dogs.
Rather than replacing the ligament, TPLO changes the angle of the tibial plateau so the knee becomes stable during weight-bearing—even without the ligament.
A controlled cut is made in the top of the tibia. The bone segment is rotated to a new position and secured with a specialized plate and screws. This stabilizes the joint and allows normal movement to resume as healing occurs.
TPLO has a high success rate and is widely considered the gold standard treatment for many dogs with cruciate ligament injuries.
What Happens After TPLO Surgery?
Most dogs stay in the hospital overnight for monitoring and pain control.
Recovery typically includes:
• Strict activity restriction during early healing
• Gradual return to controlled leash walking
• Follow-up exams and imaging
• Structured rehabilitation when recommended
Many dogs begin placing weight on the leg within days of surgery. Full recovery and return to activity usually occur over several months, depending on the individual patient.
What Is the Long-Term Outlook?
With appropriate surgical treatment and rehabilitation, most dogs return to comfortable daily activity.
While some arthritis may still develop over time, surgery significantly reduces instability and helps preserve joint function.
Early evaluation and treatment lead to the best outcomes.
When to Seek a Specialist Evaluation
If your dog is limping, hesitant to exercise, or showing signs of knee discomfort, an evaluation by a veterinary surgical specialist can help determine:
• Whether a cruciate injury is present
• If surgery is recommended
• Which treatment option is most appropriate
• What recovery will realistically look like
Clear answers reduce uncertainty—and allow you to make decisions with confidence.
If you would like to discuss TPLO surgery or have your dog evaluated, schedule a consultation with our surgical team.
