TPLO, or tibial plateau leveling osteotomy, is a surgical procedure that stabilizes a dog’s knee after a torn cranial cruciate ligament, the canine equivalent of an ACL tear in humans. It’s one of the most commonly performed orthopedic surgeries in dogs, with a total complication rate of about 11%, and it reliably restores normal limb function in the vast majority of patients.
Why the Knee Becomes Unstable
A dog’s knee (called the stifle joint) relies on the cranial cruciate ligament to keep the shinbone from sliding forward under the thighbone. When that ligament tears, either from a sudden injury or gradual wear, the top of the shinbone shifts forward with every step. This creates pain, lameness, and progressive damage to the cartilage and meniscus inside the joint.
Unlike in humans, where a torn ACL is typically replaced with a graft, the anatomy of a dog’s knee makes a different approach more effective. The top surface of a dog’s shinbone (the tibial plateau) sits at a steep angle, roughly 24 degrees in a normal dog. That slope is what drives the shinbone forward when the cruciate ligament is gone. TPLO addresses the root cause of that instability by changing the angle itself.
How the Surgery Works
The idea behind TPLO is straightforward: instead of replacing the torn ligament, the surgeon reshapes the bone so the knee no longer needs that ligament to stay stable. By flattening the slope of the tibial plateau down to about 5 to 6.5 degrees, the forward-sliding force is converted into a downward compressive force that the joint handles naturally. The surrounding muscles can then neutralize any remaining instability on their own.
Before surgery, your veterinary surgeon takes X-rays to measure the exact tibial plateau angle and plan the cut. A curved saw blade is used to make a semicircular cut near the top of the shinbone, separating the joint surface from the rest of the bone. The surgeon then rotates that top segment to the precise angle calculated beforehand. A metal bone plate and screws lock the bone in its new position while it heals. The entire procedure takes 45 to 90 minutes, with up to two hours under anesthesia total.
Why Surgeons Choose TPLO Over Other Options
Two main alternatives exist: tibial tuberosity advancement (TTA) and lateral suture stabilization (also called extracapsular repair). Each has its niche, but TPLO has become the most versatile option for several reasons.
Because the TPLO cut isolates the entire top of the shinbone, the surgeon can correct the knee in three dimensions. If a dog also has a leg that bows inward or outward, or has a rotational twist in the bone, those problems can be addressed through the same osteotomy. TTA doesn’t offer that flexibility and would require a separate procedure. TTA also has hardware size limitations that can make it less suitable for giant breeds. Meanwhile, lateral suture repair works best in smaller, less active dogs but tends to be less reliable in large, athletic breeds where the forces on the knee are greater.
The anatomy of each individual dog also matters. Dogs whose patellar tendon attaches lower on the shinbone are better candidates for TPLO, because that configuration gives the surgeon more room to rotate the bone while preserving structural support.
What Recovery Looks Like
The bone typically takes about 8 weeks to heal, but full return to unrestricted activity takes closer to 16 weeks. Recovery demands strict activity restriction, which is often the hardest part for dog owners.
During the first week, your dog should only go outside on a leash for bathroom breaks, supported with a sling under the belly. No jumping on or off furniture, no playing, no off-leash time. Food should be reduced by about 30% since your dog will be far less active and weight gain puts extra stress on the healing knee.
By week two, you can add one short, slow, controlled leash walk of about five minutes per day on top of bathroom trips. The goal is to encourage gentle use of the leg without overdoing it. From weeks five through eight, restrictions stay largely the same: no running, no ball chasing, no jumping in or out of the car. The bone is still healing, and premature activity is one of the most common causes of complications.
After the eight-week mark, your surgeon will take follow-up X-rays to confirm the bone has healed. If everything looks good, activity gradually increases over the next eight weeks until your dog can return to normal life around the four-month mark.
Home Exercises That Help
Physical therapy plays a real role in how quickly and completely your dog recovers. Most exercises are simple enough to do at home two to three times daily.
- Days 1 through 14: Passive range of motion exercises, where you gently bend and straighten the hip, knee, and ankle 10 times each. This prevents stiffness and maintains joint mobility while your dog is resting.
- Weeks 2 to 3: Sit-to-stand repetitions (encouraging your dog to push up from the hind legs), full limb stretches held for 20 seconds, and brief single-leg standing where you lift the healthy hind leg so the surgical leg bears weight.
- Weeks 3 to 6: Balance work with hind legs placed on an unstable surface like a cushion, encouraging weight shifts side to side.
- Weeks 6 to 8: Slow walks up inclines and steps, stepping over low poles on the ground, gentle tug-of-war, and brief “dancing” where you lift the front legs so the dog stands on its hind legs for a few seconds at a time.
If range of motion returns to normal by weeks two to three, the passive bending exercises can stop. The strengthening work continues to build muscle and confidence in the leg.
Complication Rates
A large retrospective study of 1,519 TPLO procedures found an overall complication rate of 11.4%. Most of those were minor. The major complication rate was 3.1%, while minor complications accounted for 8.3%.
Among minor complications, incision-related issues (swelling, mild infection at the skin level, or irritation) were the most common at 37% of all minor cases. Small fractures of the tibial crest or kneecap made up another 35%. These typically heal with continued rest and don’t require additional surgery.
Major complications requiring a second procedure were split roughly evenly among three categories: kneecap instability needing surgical correction, deep joint infection, and tibial fracture or implant failure, each accounting for about 19 to 21% of major cases. The use of cerclage wires (supplemental wire fixation) was associated with a slightly higher rate of tibial crest fractures at 4.4%, compared to 3.4% overall.
Cost of TPLO Surgery
TPLO surgery costs $2,500 to $6,000 for the operation alone. The total price, including the initial diagnostic visit, pre-surgical bloodwork, post-operative medications, follow-up appointments, and optional physical therapy, runs about $2,900 to $8,100 per knee. The wide range reflects differences in geographic location, the size of your dog (larger dogs need bigger implants and more anesthesia), and whether you pursue formal rehab sessions or do exercises at home.
If your dog has torn the cruciate ligament in one knee, there’s a meaningful chance the other knee will eventually go as well. Some estimates put the rate of bilateral tears at 40 to 60% over time, which is worth factoring into financial planning. Pet insurance typically covers TPLO if the policy was in place before the injury occurred and doesn’t exclude orthopedic conditions.