Dog Knee Injuries: The CCL: What It Is, How We Find It, and How Surgery Helps

What is the CCL and why does it matter?

Your dog’s back leg has a knee joint (also called the “stifle”). Inside that joint is a ligament called the cranial cruciate ligament (CCL). This is very similar to the ACL in a human’s knee.

This band of tissue helps hold the shin bone (tibia) and thigh bone (femur) together when your dog walks, runs, or jumps. Over time, that ligament may weaken or tear suddenly, especially when your dog turns, jumps, or lands wrong. When the CCL tears, the knee becomes unstable, which means it moves in places it shouldn’t.

What you might notice

• Limping or not bearing weight on one back leg
• Trouble getting up, jumping, or climbing stairs
• The leg may be held awkwardly or to the side
• Swelling around the knee and loss of muscle

How the vet diagnoses it

Vets test the knee for abnormal movement using the ‘drawer sign’ and ‘tibial thrust’ tests. These show if the shin bone slides too far forward. X-rays are often taken to check for arthritis or other issues. Sometimes sedation helps your dog relax so the exam is accurate.

Why surgery is often the best choice

When the CCL tears, the knee slides and causes pain, swelling, and cartilage damage. Surgery stabilizes the knee so your dog can move more comfortably and prevents further joint damage.

Common surgical options

• TPLO (Tibial Plateau Leveling Osteotomy): The surgeon reshapes the shin bone so it won’t slide. Now the CCL isn’t needed. This is the gold standard repair and has the most repeatability and consistency in outcomes.
• TTA (Tibial Tuberosity Advancement): The front of the shin bone is moved to change how the knee bears weight.
• Lateral Suture (Extracapsular Repair): A strong suture is placed outside the joint to keep it stable. This still needs the dog to grow scar tissue in place.

What to expect after surgery

Most dogs recover well with surgery and careful follow-up. Healing of the bone takes about 8 weeks, but full recovery with muscle strength and normal movement may take 3–6 months. Your vet will provide a step-by-step recovery plan and recheck schedule.

Why timing matters

Without surgery, pain and arthritis can worsen and your dog may never regain normal use of the leg. Early diagnosis, correct surgery, and good aftercare give your dog the best outcome.