CBLO vs. TPLO
Which Cruciate Surgery is Right for Your Dog?
If your dog has been diagnosed with a torn cranial cruciate ligament (CCL)—the canine equivalent of an ACL tear—you have likely come across a confusing alphabet soup of surgical options online. Two of the most common and robust procedures you will hear about are the TPLO and the CBLO.
Both of these surgeries are considered "leveling osteotomies." This means they share the exact same goal: instead of trying to replace the torn ligament with a flimsy artificial band, we fundamentally change the geometry of your dog's knee. By making a precise, curved cut in the shin bone (tibia) and rotating the top surface so it sits flat, we eliminate the need for the cruciate ligament entirely. When your dog stands up, the knee is instantly mechanically stable.
So, if they do the same thing, what is the difference, and which one does your dog need?
The TPLO
Tibial Plateau Leveling Osteotomy
The TPLO is the undisputed "Gold Standard" in veterinary orthopaedics. It has been performed globally for over two decades, meaning it is backed by an overwhelming mountain of scientific data and long-term success stories.
In a TPLO, the bone cut is made very close to the knee joint (high up on the shin bone). Studies consistently show that this specific location is incredibly stable, is gentler on the surrounding muscles during recovery, and changes the natural, overall shape of the bone the least.
The CBLO
CORA-Based Leveling Osteotomy
The CBLO is a newer, highly specialized alternative. The main difference is the location of the bone cut. In a CBLO, the cut is made further down the shin bone, away from the actual knee joint.
While it doesn't have the decades of data that the TPLO does, the CBLO is a brilliant problem-solver for specific anatomical challenges where a standard TPLO might be difficult or risky.
Why would we choose a CBLO?
If TPLO is the gold standard, why do we offer CBLO? Because sometimes, a dog's anatomy breaks the rules. We typically recommend a CBLO in two specific scenarios:
- Scenario 1
Growing Puppies
Large breed puppies can occasionally tear their cruciate ligament while their bones are still actively growing. A standard TPLO cut goes straight through the "growth plate" at the top of the shin, which can stunt the bone's growth. Because the CBLO cut is made lower down, it safely bypasses the growth plate, allowing the puppy to heal and grow normally. - Scenario 2
Extreme Bone Angles
Some dogs are born with a naturally "steep" slope to their shin bone. Trying to flatten an extreme slope with a traditional TPLO can leave the bone dangerously thin or structurally unsound. The geometry of a CBLO allows the surgeon to safely correct even the steepest of angles without compromising the strength of the leg.
The Bottom Line
You do not need to figure out which surgery your dog needs on your own. Using advanced digital x-rays, your surgeon will carefully map the geometry of your dog's knee and recommend the exact procedure that will provide the safest, strongest, and fastest recovery for their specific anatomy.