TPLO (Tibial Plateau Leveling Osteotomy) is a surgical procedure that stabilizes a dog’s knee joint after a torn cruciate ligament, the most common cause of hind-leg lameness in dogs. Rather than replacing the torn ligament, the surgery reshapes the top of the shinbone so the joint no longer needs the ligament to function. It’s the most frequently recommended knee surgery for dogs over 60 pounds, though it’s performed on dogs of all sizes. The procedure typically costs between $3,000 and $6,000, and most dogs return to normal activity within about four months.
Why Dogs Need This Surgery
Dogs have a ligament inside the knee (called the cranial cruciate ligament, or CCL) that works like the ACL in humans. It prevents the shinbone from sliding forward under the thighbone every time the dog puts weight on the leg. When this ligament tears, either partially or completely, the knee becomes unstable. The dog limps, avoids bearing weight, and the joint deteriorates over time.
Unlike ACL tears in humans, which usually happen from a single traumatic event, CCL tears in dogs often result from gradual degeneration. The ligament weakens over months or years, then gives way during normal activity. This is why the opposite knee tears in many dogs within a year or two of the first: both ligaments were degenerating at the same time.
How the Surgery Works
The key to understanding TPLO is the shape of the dog’s shinbone. The top surface of the tibia (the “tibial plateau”) slopes backward. Every time the dog bears weight, the thighbone presses against this slope and pushes the shinbone forward. In a healthy knee, the cruciate ligament absorbs that force. Without it, the bones slide against each other with every step.
TPLO takes a completely different approach from older ligament-replacement surgeries. Instead of trying to recreate the ligament with synthetic material or the dog’s own tissue, the surgeon makes a curved cut in the top of the tibia, rotates the bone fragment to flatten the slope, then locks it in place with a metal plate and screws. The goal is to reduce the tibial plateau angle to about 6.5 degrees. At that angle, weight-bearing forces travel straight down through the bone instead of pushing forward, so the knee stays stable without a ligament at all.
Computer modeling of the procedure confirms that once the tibial plateau is leveled, forward sliding of the shinbone is completely eliminated during the weight-bearing phase of walking. The forces actually reverse direction slightly, pushing the shinbone backward instead, which the intact rear cruciate ligament easily handles.
Which Dogs Are Good Candidates
TPLO is the procedure most commonly recommended by board-certified veterinary surgeons for dogs weighing over 60 pounds with a cruciate ligament rupture. It’s also the most versatile option: unlike some alternatives, TPLO works in dogs with steeper-than-normal tibial plateau angles (over 30 degrees) and in dogs with angular or rotational deformities in their legs.
Most surgeons prefer TPLO for dogs with lameness from a cruciate tear, mild existing arthritis, and no signs of a torn meniscus (the cartilage cushion inside the knee). That said, the surgery is performed across a wide range of breeds, sizes, and activity levels. Even smaller dogs benefit from the procedure, though some veterinarians may recommend a less invasive technique like lateral suture stabilization for dogs under 30 to 40 pounds.
Recovery Week by Week
The bone itself takes about eight weeks to heal, but full return to unrestricted activity typically takes 16 weeks (four months). Recovery demands strict confinement and a slow, structured increase in movement.
During the first week, your dog should be confined to a crate, kennel, or small room. Walks are limited to short leash trips outside for bathroom breaks, and you’ll likely need a sling under their belly to help support their weight. No jumping on or off furniture, no stairs, no playing. Reducing food intake by about 30% during this sedentary period helps prevent weight gain that would stress the healing joint.
By week two, you can add one controlled five-minute leash walk per day beyond bathroom trips. Walking slowly encourages your dog to use the surgical leg with more confidence. Weeks three and four bring a step up to about 10 minutes of leash walking, three times daily. If your dog seems sore after these walks, scale back to five minutes for a few days before building up again. Off-leash activity, running, and ball-chasing are still off limits.
From weeks five through eight, leash walks continue to gradually lengthen. Your veterinarian will take X-rays around the eight-week mark to confirm the bone is healing properly. If everything looks good, the second half of recovery (weeks 9 through 16) involves a progressive return to normal activity, with off-leash exercise introduced carefully toward the end.
Physical Rehabilitation
Structured rehab can significantly improve your dog’s recovery. In the early phase, this means gentle range-of-motion exercises where you slowly flex and extend the hip and knee while your dog is lying down. This prevents the joint from stiffening and helps maintain muscle tone.
As recovery progresses, many veterinary rehab facilities use an underwater treadmill. The water supports your dog’s body weight while they walk, allowing them to rebuild strength and practice a normal gait with less stress on the healing bone. Treadmill sessions start slow, with speed and duration increasing gradually over multiple visits. Water levels can be adjusted: higher water supports more weight, while lower water forces the dog to flex the knee and hip more actively.
Success Rates and Long-Term Outcomes
TPLO has strong success rates for returning dogs to normal function. Even in a demanding population of agility competition dogs, 65% returned to competition after TPLO, with most of those dogs competing again within nine months. The average recovery period before returning to competition was 7.5 months. For pet dogs with less extreme physical demands, functional outcomes are generally even better.
One important reality: arthritis will still progress in the joint over time, even after a successful TPLO. Long-term studies show that osteoarthritis scores increase gradually over the months and years following surgery. However, the progression is notably slower in dogs that had a partial tear at the time of surgery compared to those with a complete rupture. This is one argument for not delaying surgery once a cruciate problem is diagnosed, since a partial tear treated early tends to result in less long-term joint deterioration.
Complications to Know About
A large study of over 1,500 TPLO procedures found a total complication rate of 11.4%. Most complications were minor (8.3%), while major complications requiring additional surgery occurred in about 3.1% of cases.
The most common minor complications were incision-related issues like swelling or mild infection at the skin level (37% of minor complications), small fractures of the tibial crest or kneecap (35%), and pin migration requiring removal (21%). Among major complications, the most frequent were kneecap alignment problems needing surgical correction, deep joint infection, and tibial fracture or implant failure, each accounting for roughly one in five major complication cases.
Subsequent meniscal tears, where the cartilage cushion inside the knee tears after surgery, occurred in about 1% of procedures. This is a known risk because the meniscus can be damaged by the initial instability or by residual forces in the joint.
Cost and Financial Planning
TPLO typically runs $3,000 to $6,000 per knee. That range generally covers the surgery itself, anesthesia, pre-surgical exams, and immediate post-operative care. What it often does not include are pre-surgical diagnostics (X-rays, bloodwork, joint evaluation), pain medications and anti-inflammatories for home use, follow-up visits and repeat X-rays, and physical rehabilitation sessions. These additional costs can add meaningfully to the total, particularly if you pursue formal rehab with an underwater treadmill program.
If your dog has pet insurance, cruciate ligament surgery is covered by many plans, but only if the policy was in place before any signs of lameness appeared. Since cruciate disease often affects both knees, budgeting for the possibility of a second surgery is worth considering early on.