TPLO Surgery Failure and Complications in Dogs

Name: TPLO Surgery Failure and Complications in Dogs
Creator: Dr. Zubair Khalid

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-10-03

Most dogs recover well after TPLO surgery, but failure and complications do happen. The overall surgical site infection rate across published studies is about 9%, and roughly 4% of dogs need the implant removed at some point [1]. If your dog is still limping months after TPLO surgery, that is a sign worth investigating, not something to wait out.

This article is educational and is not a substitute for veterinary diagnosis or treatment.

Quick Answer

TPLO has a good reputation for a reason, but it is not risk-free. Infection, implant loosening, rotational instability, and persistent lameness are the main problems owners run into.
Surgical site infection affects about 9% of TPLO cases, and about 4% of dogs eventually need the plate and screws removed [1].
Postoperative rotational instability was found in nearly 25% of stifles in one referral-center study, and it was linked to more severe lameness before surgery [2].
Mechanical fatigue testing suggests the bone and implant can tolerate standing and walking loads, but repetitive trotting and galloping may cause cumulative fatigue damage [3].
Limping that lasts more than 8 to 12 weeks after surgery, or that gets worse instead of better, needs a veterinary recheck with X-rays.

What TPLO Surgery Is and Why It Is Done

TPLO stands for tibial plateau leveling osteotomy. It is one of the most common surgical treatments for a torn cranial cruciate ligament, the dog equivalent of an ACL tear. During the procedure, your surgeon cuts the top of the tibia, rotates that segment to change the slope of the joint surface, and holds it in place with a metal plate and screws.

The goal is to stabilize the knee without replacing the ligament. Instead of relying on a ligament to stop the shin bone from sliding forward, the surgery changes the biomechanics of the joint so the sliding force is reduced.

TPLO is not the only option. Tibial tuberosity advancement (TTA) is another common procedure, and research comparing the two for long-term arthritis development has shown mixed results. One clinical trial found less osteoarthritis progression after TTA at 6 months, while another found the opposite, and neither difference was statistically significant [4]. A third study reported more osteoarthritis progression with TTA than TPLO [4]. The bottom line is that both procedures can work, and your surgeon's experience and your dog's specific anatomy matter a great deal.

Small-breed dogs with both a cruciate tear and a luxating patella may be candidates for a modified TPLO technique using a precontoured plate, which allows both problems to be addressed in a single surgery. In one study of this approach, all patellar luxations were corrected, healing took a median of 84 days, and no dog needed a second surgery for complications [5].

If you want a broader overview of the procedure and what recovery typically looks like, see TPLO Surgery for Dogs: Cruciate Tear Recovery Timeline and Success Rate.

How to Prepare for TPLO Surgery

Preparation starts before surgery day. Your veterinarian will run bloodwork and possibly chest X-rays to confirm your dog is healthy enough for anesthesia. If your dog is a flat-faced breed like a bulldog, pug, or Boston terrier, ask about airway risks specifically. Brachycephalic dogs can have complications beyond simple airway obstruction, which you can read about in Anesthetic Complications in Brachycephalic Dogs: Beyond Airway Obstruction.

At home, set up a recovery space before your dog comes back. You will need:

A crate or small pen where your dog cannot jump, run, or slip on slick floors
Nonslip rugs or yoga mats over hard flooring
A comfortable orthopedic bed
A way to block stairs, or a plan to carry your dog up and down
Easy access to food, water, and a spot to go outside for bathroom breaks

Ask your surgeon about pain medication, antibiotic protocol, and whether your dog should stay on any current supplements. Do not give any over-the-counter medication without asking first, since some common human pain relievers are toxic to dogs.

What Happens During TPLO Surgery

TPLO is performed under general anesthesia. The surgeon makes an incision over the inside or outside of the knee, depending on their approach. If you are curious about the anatomy involved, Surgical Approaches to the Canine Stifle: Medial and Lateral explains the difference.

Once the joint is open, the surgeon inspects the meniscus, a cartilage pad inside the knee. Meniscal tears are common with cruciate injuries and are often trimmed or removed at the same time. Then the tibia is cut, rotated, and fixed with a plate and screws.

The procedure usually takes 1 to 2 hours per knee. Most dogs stay overnight for pain control and monitoring, though some hospitals send dogs home the same day.

Recovery Timeline and Home Care

Recovery is gradual and requires strict activity restriction. The table below gives a general timeline, but your surgeon will set the exact schedule for your dog.

Time After Surgery	What to Expect	Activity Level
Days 1 to 3	Groggy, incision sore, may not want to eat much	Confined to crate or small pen, leash only for bathroom breaks
Week 1 to 2	Incision checked at recheck, stitches or staples removed around day 10 to 14	Short leash walks for potty only, no stairs if possible
Week 2 to 4	Swelling should be gone, some dogs start bearing weight	Slow, short leash walks, 5 to 10 minutes, 2 to 3 times daily
Week 4 to 8	X-rays often taken to check bone healing	Walks gradually lengthened, still no running or jumping
Week 8 to 12	Most dogs are walking well, some still have a mild limp	Controlled leash walks, gentle incline work if approved
Month 3 to 6	Bone healing usually complete, strength rebuilding	Gradual return to normal activity, avoid sharp turns and rough play

Bone healing after TPLO can take longer than many owners expect. In one study of small-breed dogs having modified TPLO, median bone healing time was 84 days, with a range of 57 to 233 days [5]. In a study of very large dogs (45 to 70 kg), healing scores were lower than ideal, and heavier dogs had more change in their tibial plateau angle over time [6].

Home care during recovery includes:

Strict leash control for every trip outside
No jumping on furniture, no stairs if avoidable
Ice or cold packs if your surgeon recommends them
Keeping the incision clean and dry
Checking the incision daily for redness, swelling, discharge, or odor
Giving all medications exactly as prescribed

If your dog has had a blood transfusion for any reason during or after surgery, watch for reactions. Complication Recognition in Canine Blood Transfusion Reactions covers what to look for.

Dog TPLO Surgery Complications and Warning Signs

Complications after TPLO range from minor to serious. Knowing what to watch for helps you act quickly.

Infection

Surgical site infection is the most common complication. A meta-analysis of 30 studies covering 8,820 dogs and 9,576 TPLOs found an overall infection rate of 9.11%, with individual study rates ranging from 2.9% to 25.9% [1]. The same analysis found that about 4.11% of dogs needed the implant removed [1]. A separate systematic review confirmed that surgical site infections after TPLO are a significant clinical concern and that identifying risk factors can guide prevention [7].

Signs of infection include:

Redness, warmth, or swelling around the incision
Discharge that is cloudy, yellow, or foul-smelling
Fever, lethargy, or loss of appetite
Pain that seems to be getting worse instead of better

Some infections are superficial and respond to antibiotics. Others are deep and may require surgery to flush the site or remove the plate.

Implant Failure and Loosening

The plate and screws can loosen, break, or cause irritation over time. A biomechanical study using finite element analysis found that stress concentrates near the third and sixth tibial screws and the proximal fibula, and that displacement is greatest in the caudolateral tibia [3]. That study also found that standing and walking loads did not cause fatigue failure, but trotting and galloping did produce fatigue damage in the bone and fibula [3]. This is one reason strict activity restriction matters so much in the first few months.

In very large dogs (45 to 70 kg), a 3.5 mm TPLO locking compression plate showed a significant change in tibial plateau angle between surgery and the 6-week recheck, with heavier dogs and left hindlimbs showing more change [6]. Eight of 36 dogs in that study had postoperative complications, and 2 of 36 developed surgical site infections [6].

Rotational Instability

Rotational instability means the knee still has abnormal rotational movement after surgery. In a study of 312 stifles, postoperative rotational instability was identified in 24.6% of cases and required placement of an antirotational suture [2]. Dogs with more severe lameness before surgery had higher odds of instability, while dogs with a chronic (long-standing) cruciate tear had lower odds [2].

Persistent Limping Months After TPLO Surgery

This is one of the most common reasons owners search for answers. Some limping is normal early on. A dog that is still limping 3, 4, or 6 months after TPLO surgery needs a veterinary workup.

Possible causes include:

Infection that was not fully resolved
Implant loosening or irritation
Rotational instability
Meniscal tear that developed after surgery
Incomplete bone healing
Arthritis that was already present before surgery
A problem in the other leg

Your veterinarian will likely recommend X-rays and a hands-on orthopedic exam. Sometimes the answer is physical therapy and more time. Sometimes it is a second surgery.

Questions to Ask Your Veterinarian

Before surgery, ask:

How many TPLOs do you perform each year?
What is your personal infection rate and complication rate?
What plate and screw system will you use, and why?
Will you inspect and treat the meniscus during surgery?
What is your protocol for antibiotics before, during, and after surgery?
What does the recovery schedule look like week by week?
What signs should make me call you immediately?
What is the plan if my dog is still limping at 3 months?

After surgery, ask:

Is the bone healing on schedule based on these X-rays?
Are the plate and screws still in the right position?
Do we need to adjust activity, medication, or physical therapy?
Should we consider a referral to an orthopedic specialist?

Limitations and When to Contact a Veterinarian

No article can tell you what is happening in your dog's knee. Individual cases need a veterinarian who can examine your dog, review X-rays, and consider the full history.

Contact your veterinarian the same day if you notice:

Incision discharge, foul odor, or increasing redness
Fever, lethargy, or refusal to eat
Sudden increase in pain or lameness
Swelling in the leg that is new or getting worse
Your dog licking or chewing at the incision

Go to an emergency clinic immediately if you see:

The incision opens up or you can see the plate
Heavy bleeding that does not stop with pressure
Your dog cannot bear weight at all on the operated leg
Difficulty breathing, collapse, or pale gums
Signs of a severe allergic reaction such as facial swelling or hives

Schedule a routine recheck if:

Your dog is still limping more than 8 to 12 weeks after surgery
The limp is getting worse instead of better
Your dog seems painful after activity
You are unsure whether the recovery is on track

Frequently Asked Questions

What is the success rate of dog TPLO surgery?

Most dogs return to good function after TPLO, and the procedure is considered the preferred surgical treatment for cranial cruciate ligament rupture in many cases [3]. However, success is not universal. Complications such as infection, implant problems, and rotational instability do occur, and some dogs need additional treatment. Your surgeon's experience and your dog's size, age, and overall health all affect the outcome.

How common is infection after TPLO?

Infection is the most frequently reported complication. Pooled data from multiple studies put the overall surgical site infection rate at about 9%, though individual studies have reported rates as low as 2.9% and as high as 25.9% [1]. About 4% of dogs end up needing the implant removed [1]. Following your surgeon's wound care instructions carefully can lower the risk.

Can a TPLO plate fail or break?

Yes, though it is not the most common complication. Stress concentrates around certain screws and the fibula, and repetitive high-impact activity like trotting and galloping can cause fatigue damage to the bone and implant over time [3]. Very large dogs may also see changes in their tibial plateau angle after surgery, which can affect how well the plate maintains the correction [6].

Why is my dog still limping months after TPLO surgery?

Persistent limping months after surgery is not normal and should be investigated. Possible causes include infection, implant loosening, rotational instability, a new meniscal tear, incomplete bone healing, or pre-existing arthritis. Your veterinarian will need to examine your dog and take X-rays to figure out what is going on. Do not wait to see if it resolves on its own.

Is TPLO better than TTA for preventing arthritis?

The evidence is mixed. One clinical trial found less osteoarthritis progression after TTA at 6 months, while another found less after TPLO, and neither difference was statistically significant [4]. A third study reported significantly more osteoarthritis progression with TTA than TPLO [4]. Overall, the strength of evidence comparing the two procedures for this specific outcome is weak, so the choice often comes down to surgeon preference and your dog's individual needs.

References

Tibial plateau leveling osteotomy surgical site infections: A systematic review with meta-analysis of prevalence and associated risk factors. Veterinary surgery : VS, 2026.
Postoperative rotational instability after tibial plateau-leveling osteotomy is associated with acute cranial cruciate ligament rupture and meniscal injury. American journal of veterinary research, 2026.
Biomechanical evaluation of structural integrity after tibial plateau leveling osteotomy in dogs using finite element analysis. Scientific reports, 2026.
In dogs with ruptured cranial cruciate ligament, is TPLO superior to TTA in reducing postoperative radiographic osteoarthritis?. Veterinary evidence, 2026.
Modified tibial plateau-leveling osteotomy using a precontoured plate achieves single-stage correction with favorable clinical outcomes in small-breed dogs. American journal of veterinary research, 2026.
Effect of a 3.5 mm Tibial Plateau Leveling Osteotomy Locking Compression Plate on Serial Postoperative Tibial Plateau Angle Maintenance, Short-Term Osteotomy Healing, and Complication Rates in 45 to 70 kg Dogs. Veterinary and comparative orthopaedics and traumatology : V.C.O.T, 2026.
Surgical site infections in canine tibial plateau leveling osteotomy: a systematic review and meta-analysis. Journal of the American Veterinary Medical Association, 2026.