TPLO, or tibial plateau leveling osteotomy, is a surgical procedure that stabilizes a dog’s knee after a torn cranial cruciate ligament (CCL), the canine equivalent of the ACL in humans. First developed in 1993, it is now considered the gold standard for treating CCL tears in dogs of all sizes. The surgery works by reshaping the top of the shinbone so the knee joint remains stable without needing the torn ligament to function.
Why Dogs Need TPLO Surgery
The CCL is a band of tissue inside the knee (called the stifle in dogs) that prevents the shinbone from sliding forward relative to the thighbone. When it tears, every step your dog takes pushes the shinbone forward in an uncontrolled way, causing pain, inflammation, and progressive joint damage. Unlike in humans, where ACL tears are usually sudden sports injuries, CCL tears in dogs often develop gradually from chronic degeneration of the ligament.
A torn CCL can show up as a sudden, severe limp where your dog barely touches their toes to the ground, or as a longer-lasting lameness that seemed to improve with rest but never fully went away. Over time, muscle wasting in the affected leg becomes noticeable, and the knee itself feels thicker and swollen compared to the healthy side. Veterinarians confirm the diagnosis with two hands-on tests: the “drawer test,” where the vet tries to slide the shinbone forward, and the “tibial compression test,” which mimics the forces of weight-bearing. X-rays taken during these maneuvers detect forward displacement of the shinbone in about 97% of confirmed tears.
Partial tears are trickier. The knee may not feel obviously loose on exam, so vets rely more heavily on detecting joint swelling and the buildup of scar tissue around the joint. Left untreated, partial tears almost always progress to complete tears.
How the Surgery Works
In a healthy knee, the top surface of the shinbone (the tibial plateau) slopes backward at an angle. This slope is the root of the problem: when a dog bears weight, that angled surface creates a forward-directed force on the shinbone. The CCL normally counteracts that force, but once the ligament is gone, nothing holds the shinbone back.
TPLO eliminates that forward force by changing the angle of the tibial plateau itself. The surgeon makes a curved, semicircular cut through the top of the shinbone, then rotates that top segment backward until the plateau is nearly level, typically achieving an angle of about 5 to 6.5 degrees. A metal bone plate and screws lock the two pieces of bone in their new positions so they can heal together. The result is a knee that stays stable during movement without relying on the torn ligament at all.
Recovery Timeline
Recovery takes a minimum of eight weeks of strict activity restriction, followed by a gradual return to normal activity by 12 weeks. Your dog should not run, jump, or play off-leash until X-rays confirm the bone has healed. The entire process is built around controlled, incremental increases in movement.
Week 1: Gentle range-of-motion exercises (slowly bending and straightening the knee, 10 repetitions three times a day) and very short leash walks of 5 to 10 minutes, three times daily. Cold packs on the surgical site for 10 to 15 minutes several times a day help with swelling.
Weeks 2 and 3: Leash walks increase to 10 to 20 minutes, three times a day. Most dogs start putting some weight on the leg by week 2, though some take longer. You can stop the passive range-of-motion exercises once your dog is using the leg consistently.
Weeks 4 and 5: Walks extend to 20 to 30 minutes. This is when rehabilitation exercises begin in earnest: sit-to-stand repetitions, figure-of-eight walking patterns, and wall-assisted stands that prevent your dog from shifting weight off the surgical leg. Swimming for one to three minutes twice a day is helpful if available. Most dogs have a noticeable limp at this stage but are putting decent weight on the leg during slow walks.
Weeks 6 through 8: Walks reach 30 to 40 minutes once daily, and you can add inclines, hills, ramps, and stair climbing. X-rays at the eight-week mark determine whether the bone has healed enough to begin the final phase.
Weeks 9 through 12: Assuming the bone has healed, your dog transitions to faster walks and short straight-line runs of 10 to 15 minutes. By the end of week 12, most dogs return to full activity.
Physical Rehabilitation
Professional rehabilitation can speed recovery and improve outcomes. Early-phase therapy focuses on pain control and reducing swelling through massage, cold therapy, therapeutic laser, and electrical nerve stimulation. As healing progresses, an underwater treadmill becomes one of the most valuable tools. The buoyancy of the water supports your dog’s weight while encouraging a normal gait pattern, and water levels can be adjusted to target different muscles and joint angles.
Later exercises build strength and body awareness: balance board work, walking backward, small controlled jumps, and “dancing” (lifting the front legs to load the hind legs). Trigger point therapy using dry needling or manual techniques addresses muscle tension that develops from weeks of compensating for a painful limb.
Success Rates and Outcomes
TPLO has the strongest track record of any CCL surgery in dogs. Long-term studies show dogs recover to about 93% of normal function more than a year after surgery, and TPLO is the only surgical technique in which dogs consistently achieve full, normal limb function. Owner and veterinarian assessments both rate TPLO outcomes as superior to the main alternatives.
Compared to other procedures like TTA (tibial tuberosity advancement), TPLO provides faster improvement in joint range of motion in the first month, lower complication rates, better long-term limb function, and less progression of arthritis. It is the overwhelming technique of choice among veterinary orthopedic specialists for dogs over about 33 pounds, though it is increasingly used in smaller dogs as well.
Risks and Complications
No surgery is without risk. Postoperative infection occurs in roughly 6.6% of cases, making it the most common complication. Signs include increased swelling, redness, discharge from the incision, or fever in the days and weeks following surgery. Most infections respond well to treatment when caught early.
Meniscal injury is the other significant concern. The meniscus is a cushion of cartilage inside the knee that often sustains damage alongside or because of the CCL tear. About one-third of dogs already have meniscal damage at the time of surgery, which the surgeon addresses during the procedure. A smaller percentage, around 2.8%, develop new meniscal tears after surgery, which can cause a return of lameness and may require a second procedure.
Implant-related problems, such as loosening of the plate or screws, are less common but can occur, particularly if a dog is allowed off-leash activity too soon during recovery.
Cost of TPLO Surgery
The surgery itself typically costs between $2,500 and $6,000 per knee. Total costs, including the initial diagnostic visit ($250 to $600 for the exam, sedation, and X-rays), post-surgery medications and follow-up appointments ($50 to $300), and follow-up X-rays ($150 to $400), bring the full price to roughly $2,900 to $8,100. Geographic location, the size of your dog, and whether you use a general practice veterinarian or a board-certified surgeon all influence where you fall in that range. Many veterinary practices offer payment plans, and pet insurance policies that were in place before the injury typically cover a significant portion of the cost.