The Modified Maquet Procedure (MMP) is an evolution of the Tibial Tuberosity Advancement (TTA) that uses a titanium foam wedge instead of a cage to advance the tibial tuberosity.

It has been positioned as a less invasive, faster-to-perform alternative to TPLO for dogs with CCL rupture.

Published clinical evidence shows both procedures produce good outcomes, with TPLO demonstrating a slight advantage in objective gait analysis at 3 months.

Quick answer: A prospective randomized study found TPLO achieves 93.9% of normal peak vertical force vs 89.4% for MMP at 6 months — no significant difference in complications or OA progression. MMP is less invasive, faster, and generally less expensive. Both are appropriate for medium-to-large breed dogs.

Key takeaways

• TPLO achieves 93.9% of normal ground reaction force at 6 months vs 89.4% for MMP — numerically superior but not statistically significant
• No significant difference in major complications or OA progression was found between TPLO and MMP in the comparative study
• MMP is less invasive and faster to perform: a titanium foam wedge and partial osteotomy instead of TPLO's full proximal tibial cut
• MMP is generally less expensive than TPLO: shorter surgical time and different implant costs reduce the procedure price
• Early partial weight-bearing may occur sooner after MMP due to less invasive fixation and the partial osteotomy
• TPLO has a much larger evidence base: 25+ years of data vs limited MMP evidence

How each procedure works

TPLO (Tibial Plateau Leveling Osteotomy)

TPLO addresses CCL rupture by making a curved osteotomy through the proximal tibia and rotating the tibial plateau to approximately 5 degrees.

This changes joint biomechanics so the stifle is stable during weight-bearing without a functioning CCL. The osteotomy is held in place with a bone plate and screws.

Modified Maquet Procedure (MMP)

MMP is an adaptation of TTA in which the tibial tuberosity is advanced cranially by making a partial osteotomy in the tibial crest.

A porous titanium foam wedge is inserted into the gap and a fixation staple holds the construct in position.

The cranial advancement of the tuberosity repositions the patellar tendon to neutralize the cranial thrust that occurs in the CCL-deficient stifle the same biomechanical principle as TTA, with different implants.

Animal Works Veterinary Surgery describes MMP as using improved implants and surgical techniques designed to reduce operating time and minimize complications compared to standard TTA.

The titanium foam wedge promotes bone ingrowth and healing without the need for a cage or plate system. Bone healing in the MMP osteotomy site is typically complete at 90 days radiographically.

Clinical evidence: TPLO vs MMP

Primary comparative study

PubMed (prospective randomized controlled study, 61 dogs, 76 joints): dogs were treated with TPLO (n=30, 41 joints) or MMP (n=31, 35 joints) and compared with healthy controls.

Outcomes were assessed by clinical examination, radiography, and treadmill force plate gait analysis at 6 weeks, 3 months, and 6 months.

Results at 6 months:

• TPLO: 93.9% of normal peak vertical force (PVF), 85.9% of normal vertical impulse (VI)
• MMP: 89.4% of normal PVF, 79.9% of normal VI

At 3 months, significantly more TPLO patients were within the reference range for healthy dogs on peak vertical force. By 6 months, the difference was not statistically significant.

No significant difference was found in major complications or OA progression at any time point.

Conclusion from the study: "Although no significant differences were found between the surgical methods, TPLO patients showed superiority with regard to clinical outcome."

MMP standalone study

PMC (35 dogs, unilateral CCL rupture, MMP): significant improvement in ground reaction forces at all time intervals. At 90 days, 54.2% of patients had a Symmetry Index suggesting normal gait.

Complete bone healing on radiographs at 90 days. Major complication rate: 8.5% (3 of 35), minor complication rate: 2.8%.

Practical comparison

Which dogs are best suited to each?

MMP is often chosen for:

• Medium and large breed dogs where a less invasive approach is preferred
• Cases where surgical time is a clinical consideration
• Practices experienced in MMP technique
• Dogs where cost is a factor

TPLO is typically recommended for:

• Large and giant breed dogs with high joint loads
• Dogs with steep tibial plateau angles where TPLO provides more precise biomechanical correction
• Cases where the largest available evidence base is preferred
• Surgeons with established TPLO experience

Animal Hospital of Adel notes that both surgeries are effective, with MMP being less invasive, less expensive, and quicker to perform.

Walkerville Vet's evidence review concludes that TPLO gives slightly better objective results and that MMP is expected to outperform standard TTA, though more evidence is needed.

For the full TPLO pros and cons, see TPLO surgery pros and cons for dogs. For the full alternatives overview, see alternatives to TPLO surgery for dogs.

Frequently asked questions

Is MMP as effective as TPLO for large dogs?

The evidence suggests TPLO has a slight advantage at 3 months, with equivalent outcomes by 6 months in the primary comparative study.

Most surgeons still prefer TPLO for large and giant breeds due to the larger evidence base and slightly superior short-term objective results. MMP is appropriate for many large dogs in experienced hands.

How much cheaper is MMP than TPLO?

MMP is generally less expensive than TPLO due to shorter surgical time and different implant costs. The specific difference varies by practice, region, and surgeon.

Ask your veterinarian for a direct cost comparison for your dog's specific case.

What is the complication rate for MMP compared to TPLO?

The MMP standalone study reported an 8.5% major complication rate. TPLO complication rates across the literature range from 14 to 34%.

However, these figures come from different study populations and settings, making direct comparison difficult. Neither procedure is free of risk.

How long does MMP recovery take compared to TPLO?

Both procedures require 8 to 12 weeks of restricted activity, though MMP's less invasive partial osteotomy may allow earlier partial weight-bearing in some dogs.

Full activity return for both procedures is typically at 4 to 6 months.

Can a dog have TPLO if MMP fails?

Yes. TPLO can be performed as a revision if MMP results in ongoing instability or poor function. The converse is less common.

Discuss revision options with an orthopedic specialist if your dog is not progressing as expected after MMP.

Resources

• PubMed. Outcome after Tibial Plateau Levelling Osteotomy and Modified Maquet Procedure in Dogs with CCL Rupture. pubmed.ncbi.nlm.nih.gov
• PMC. Outcome after Modified Maquet Procedure in Dogs: Force Plate Gait Analysis. ncbi.nlm.nih.gov
• Animal Works Veterinary Surgery. MMP vs TPLO. animalworksvets.com
• Dog Knee Injury. Modified Maquet Procedure (MMP Surgery) for Dogs. dogkneeinjury.com
• Walkerville Vet. Which ACL Surgery Is Best for Dogs? walkervillevet.com.au

Tibial Plateau Leveling Osteotomy (TPLO) is a common surgery to fix cranial cruciate ligament injuries in dogs. However, sometimes the implants used in TPLO can loosen, causing pain and complications. Understanding TPLO implant loosening causes and treatment options is important for pet owners to ensure a smooth recovery.

This article explains why TPLO implant loosening happens, how to recognize it, and what treatment choices are available. You will learn practical information to help your dog heal well after TPLO surgery.

What causes TPLO implant loosening?

TPLO implant loosening happens when the screws or plates used to stabilize the bone move or fail to hold properly. Several factors can contribute to this problem. Knowing these causes helps prevent loosening and guides treatment decisions.

• Improper surgical technique: If the implant is not placed correctly, it may not secure the bone well, increasing the risk of loosening during healing.
• Infection at surgical site: Infection can weaken bone and soft tissues around the implant, causing instability and loosening over time.
• Poor bone quality: Dogs with weak or diseased bone may not hold implants firmly, leading to early loosening after surgery.
• Excessive activity post-surgery: Allowing the dog to move too much before healing can stress the implant and cause it to loosen.

Understanding these causes helps veterinarians and owners work together to minimize implant loosening risks after TPLO surgery.

How can you recognize TPLO implant loosening in your dog?

Detecting implant loosening early is key to preventing further damage. Owners should watch for signs that suggest the implant is not stable. These signs often appear within weeks to months after surgery.

• Increased lameness or pain: If your dog suddenly limps more or shows pain around the surgery site, it may indicate implant problems.
• Swelling or heat at incision: Infection or inflammation near the implant can cause visible swelling or warmth.
• Abnormal limb movement: Unusual wobbling or instability when walking can signal implant loosening.
• Changes in behavior: Reluctance to bear weight or decreased activity may reflect discomfort from implant issues.

If you notice these signs, consult your veterinarian promptly for evaluation and imaging tests to confirm implant status.

What diagnostic methods confirm TPLO implant loosening?

Veterinarians use several diagnostic tools to assess implant stability. Accurate diagnosis guides treatment and helps prevent complications.

• Physical examination: Palpation and manipulation of the leg can reveal abnormal movement or pain near the implant.
• Radiographs (X-rays): X-rays show implant position, bone healing, and any signs of loosening such as gaps or screw back-out.
• Advanced imaging: CT scans provide detailed views of bone and implant interfaces, useful in complex cases.
• Laboratory tests: Blood work and culture samples help detect infection that may cause loosening.

Combining these methods ensures a thorough assessment of TPLO implant condition.

What treatment options exist for TPLO implant loosening?

Treatment depends on the cause and severity of implant loosening. Early intervention improves outcomes and reduces complications.

• Restricted activity: Limiting movement helps reduce stress on the implant and supports healing.
• Antibiotic therapy: If infection is present, targeted antibiotics are essential to control bacterial growth.
• Surgical revision: In severe cases, removing or replacing the loosened implant may be necessary to restore stability.
• Supportive care: Pain management and physical therapy aid recovery and improve limb function.

Your veterinarian will tailor treatment based on your dog’s condition and response to therapy.

How can TPLO implant loosening be prevented?

Prevention focuses on careful surgery and post-operative care. Owners play a key role in following veterinary instructions to avoid complications.

• Choose experienced surgeons: Skilled surgeons reduce risks by placing implants accurately and minimizing tissue damage.
• Follow post-op restrictions: Strictly limiting your dog’s activity during healing prevents undue implant stress.
• Monitor for infection: Keeping the incision clean and watching for signs of infection helps catch problems early.
• Regular veterinary check-ups: Scheduled visits allow early detection of implant issues before they worsen.

These steps help ensure the implant remains secure and the bone heals properly after TPLO surgery.

What is the prognosis after treating TPLO implant loosening?

The outlook depends on how quickly loosening is identified and treated. Early care often leads to good recovery, while delays can cause complications.

• Early intervention success: Prompt treatment usually restores implant stability and allows normal healing.
• Complications risk: Untreated loosening can cause chronic pain, infection, or joint instability.
• Long-term function: Many dogs regain good limb use after successful treatment and rehabilitation.
• Owner compliance importance: Following veterinary advice improves healing and reduces recurrence risk.

With proper management, most dogs recover well and return to active lives after TPLO implant loosening treatment.

What are the common complications of TPLO implant loosening?

Implant loosening can lead to several complications that affect your dog’s health and recovery. Recognizing these helps in timely management.

• Infection spread: Loosened implants can harbor bacteria, causing deep infections that are harder to treat.
• Delayed bone healing: Instability slows or prevents proper bone fusion after osteotomy.
• Joint instability: Loss of implant support may cause abnormal joint movement and arthritis development.
• Chronic pain: Persistent discomfort reduces quality of life and mobility.

Early diagnosis and treatment of implant loosening minimize these risks and improve recovery chances.

Conclusion

TPLO implant loosening is a serious but manageable complication after cruciate ligament surgery in dogs. Knowing the causes, signs, and treatment options helps owners support their pets through recovery.

Early veterinary evaluation and following post-operative care instructions are essential to prevent and treat implant loosening effectively. With proper care, most dogs regain good limb function and enjoy a healthy, active life after TPLO surgery.

What are the signs of TPLO implant loosening in dogs?

Signs include increased limping, swelling or heat at the surgery site, abnormal limb movement, and reluctance to bear weight or play.

Can infection cause TPLO implant loosening?

Yes, infection weakens tissues around the implant, leading to instability and loosening if not treated promptly.

How is TPLO implant loosening diagnosed?

Diagnosis involves physical exams, X-rays, possibly CT scans, and lab tests to check for infection or implant movement.

What treatments are available for TPLO implant loosening?

Treatment includes restricted activity, antibiotics for infection, surgical revision if needed, and supportive care like pain management.

How can I prevent TPLO implant loosening after surgery?

Prevention involves choosing skilled surgeons, following strict post-op activity limits, monitoring for infection, and attending regular vet check-ups.

A clicking or popping sound from the stifle after TPLO surgery is a common observation that owners report, especially during the first weeks of recovery.

It is not automatically a sign of a problem.

The clinical significance depends on what accompanies the click: is the dog bearing weight and recovering normally, or is clicking associated with lameness, pain, or a trajectory reversal?

Quick answer: Post-TPLO clicking most often reflects normal joint adjustment, soft tissue movement, or cavitation. The most clinically important cause is a meniscal tear, producing a meniscal click with pain and returning lameness. Clicking without lameness or pain in early recovery is usually benign.

Key takeaways

• Most post-TPLO clicking is benign: the click typically comes from joint adjustment to new mechanics; the dog usually feels fine even when a sound is present
• The meniscal click is the clinically significant type: dogs with meniscal tears exhibit a meniscal click accompanied by lameness and pain
• Clicking with lameness or pain warrants prompt veterinary evaluation: clicking with swelling, limping, or avoiding the leg could signal instability, implant issues, or a torn meniscus
• Clicking that is isolated, early in recovery, and not associated with lameness is usually normal and improves as healing progresses
• Late-onset clicking in a previously normal recovery is more concerning than early clicking; it suggests a new event such as meniscal tear or implant loosening
• Implant loosening is a rare but serious cause of clicking: abnormal joint mechanics from loosened screws or plate produce clicking accompanied by pain and radiographic changes

What causes clicking after TPLO surgery

Normal joint adjustment

After TPLO, the tibial plateau is repositioned to a new angle. The soft tissues, tendons, and joint capsule require weeks to adapt to this new geometry.

During this adaptation period, movement can produce audible sounds as structures slide over each other or snap slightly over new contours.

TPLO Info confirms: after CCL repair, the joints adjust to new motion. The click comes from the knees. The dog usually feels fine even when a sound is present.

Soft tissue movement over the implant

The TPLO plate sits against the medial tibial surface. Tendons and fascial layers that previously moved over the normal tibial contour now move over a plate with a different profile.

This can produce audible snapping or clicking sounds during flexion and extension, particularly in the first weeks before soft tissue accommodation occurs.

Gas bubble release (cavitation)

Joint capsule distension from post-surgical effusion can trap gas in the joint space. Movement releases this gas in small pops -- the same mechanism as knuckle cracking in humans.

This is painless and harmless.

Meniscal click (most significant cause)

The medial meniscus is vulnerable to injury in CCL disease. At the time of TPLO, the surgeon assesses the meniscus and removes damaged tissue.

However, meniscal injury can occur after TPLO -- either from previously undetected damage that progresses, or from new injury in a joint that has not yet fully stabilized.

Laguna Woods Vets confirms: dogs with meniscal tears frequently exhibit a meniscal click. If damage is noted during TPLO, the meniscus is removed. If not removed, it may tear later.

SustainableVet.org confirms: symptoms of meniscal damage include clicking when the dog moves, lameness, reluctance to use the affected leg, and discomfort when bending the knee.

The meniscal click is distinguished from benign clicking by:

• Accompanying lameness (often a sudden return of limping after initial improvement)
• Pain when the stifle is manipulated on examination
• Worsening trajectory rather than improvement

Implant-related clicking (uncommon)

Plate or screw loosening generates abnormal tibial motion during weight bearing, which can produce clicking.

This is uncommon in an uncomplicated TPLO but more likely if the dog has been overactive during recovery.

Signs include pain localized to the plate site and radiographic evidence of implant migration or peri-implant bone changes.

SustainableVet.org confirms: implant failure is rare but serious; plates or screws can loosen or break if the dog is too active early, leading to discomfort and joint noises.

Normal vs. concerning clicking: a practical guide

Likely normal (benign):

• Clicking present from the first days after surgery
• No lameness associated with the click
• Dog is bearing weight and improving week by week
• Click is quiet and intermittent
• Dog does not react (wince, pull back, vocalize) when the stifle is manipulated

Warrants veterinary evaluation:

• Clicking that appears new after a period of recovery without clicking
• Clicking accompanied by lameness or reluctance to bear weight
• Dog flinches or vocalizes when the stifle is flexed
• Clicking that is getting louder or more frequent over time
• Lameness that had been improving and then reverses

SustainableVet.org confirms: contact your vet if the clicking sound is persistent or getting worse over time; a mild clicking early in recovery is normal but it should improve as healing progresses.

Meniscal tear after TPLO: what happens next

If a meniscal tear is suspected or confirmed, management depends on severity.

Mild cases: pain management with NSAIDs, joint supplements, and controlled exercise restriction. The meniscus may stabilize with conservative management if the tear is small and the joint is otherwise stable.

Cases with ongoing pain or lameness: partial meniscectomy (surgical removal of the torn portion of the meniscus) is required. This is a second surgical procedure requiring general anesthesia and a repeat recovery period.

SustainableVet.org confirms: if a meniscal tear causes ongoing pain and instability, surgery is often needed; this may involve a partial meniscectomy.

Larger dogs and clicking

Larger dogs are more likely to produce audible joint sounds during recovery. Greater body mass means greater joint loading forces, which amplify soft tissue and implant movement sounds.

SustainableVet.org confirms: larger dogs are more likely to make joint sounds during recovery; their extra weight puts more pressure on the healing leg, which can make clicking more noticeable.

This does not mean clicking in large dogs is more likely to be pathological -- only that it is more audible when it occurs.

When to contact your vet about clicking

Contact your vet promptly (same day or within 24 hours) if:

• Clicking is accompanied by lameness or non-weight bearing
• A dog that was improving begins to worsen (trajectory reversal)
• The click is producing a visible pain response
• The click appears late in recovery (after weeks of silent healing)

Contact at your next scheduled appointment (can wait):

• Intermittent clicking early in recovery without lameness
• Click that is quieter week by week
• Dog is bearing full weight and improving in function

For the full TPLO complications guide, see common complications after TPLO surgery. For the toe-tapping guide, see dog toe tapping after TPLO surgery.

For the lameness guide, see lameness after TPLO surgery in dogs. For the leg shaking guide, see dog leg shaking after TPLO surgery.

Frequently asked questions

My dog's knee has been clicking for 3 weeks but she is not limping at all. Should I be worried?

Three weeks of clicking with no lameness and a normal, improving recovery trajectory is most likely benign joint adjustment. Monitor for lameness, pain on stifle palpation, or worsening of the click.

Mention it at your next scheduled vet appointment -- this is not an emergency call.

My dog's leg clicked once loudly while getting up, and then she held the leg up. What do I do?

Contact your vet the same day. A sudden loud click followed by acute lameness may indicate a meniscal injury event. This presentation warrants veterinary examination and likely radiographs.

Can clicking after TPLO get better on its own?

Yes -- benign mechanical clicking from joint adjustment and soft tissue accommodation typically resolves or reduces significantly over the first 4 to 8 weeks.

A meniscal click does not resolve without treatment of the meniscal tear.

Does clicking mean the plate is failing?

Not typically. Implant failure clicking is accompanied by pain and worsening lameness. Benign clicking in a comfortable, normally-recovering dog does not indicate implant failure.

Radiographs at the scheduled 6-week and 12-week appointments assess implant integrity.

My dog clicks on every step. Is that different from occasional clicking?

Consistent clicking on every step, particularly if it has a regular, reproducible pattern during weight bearing, is more likely to have a structural cause (meniscal click) than intermittent clicking.

Mention this to your vet and assess whether lameness is present.

Resources

• TPLO Info. Why Is My Dog's Leg Clicking After TPLO Surgery? tploinfo.com
• SustainableVet. Why Is My Dog's Leg Clicking After TPLO Surgery? sustainablevet.org
• Laguna Woods Vets (LHAH). TPLO Surgery Complications. lhah.com
• ACVS. Cranial Cruciate Ligament Disease. acvs.org

A meniscal tear after TPLO surgery is one of the most recognized post-operative complications.

The medial meniscus is at risk both at the time of CCL rupture and after surgery, when residual instability or degenerative changes can damage tissue that appeared normal during the original procedure.

Recognizing the signs early significantly improves outcomes.

Quick answer: Post-TPLO meniscal tears present as sudden lameness return in a previously improving dog, often with a meniscal click. Late tears occur in 2 to 22% of TPLO cases (RCVS). PubMed found 5.6% late meniscal tear incidence. Treatment is partial meniscectomy; all dogs treated returned to peak limb function per PubMed.

Key takeaways

• Late meniscal tears occur in 2 to 22% of post-TPLO dogs: RCVS confirms this range; a PubMed TPLO arthroscopy study found a 5.6% late meniscal tear incidence
• The hallmark sign is sudden lameness regression in a previously improving dog: RCVS confirms affected dogs display good mobility and then go suddenly lame; this trajectory reversal distinguishes meniscal injury
• The meniscal click is audible but not always present: the absence of a click does not rule out meniscal injury
• The meniscus does not heal on its own: limited blood supply prevents natural regeneration; small tears may be managed conservatively but most require partial meniscectomy
• Partial meniscectomy produces excellent outcomes: all dogs treated by partial meniscectomy returned to peak limb function (PubMed); outcomes at 6 months are comparable to dogs with intact menisci
• Concurrent meniscal tears do not worsen long-term outcomes: AVMA research found similar midterm outcomes for TPLO plus meniscectomy vs TPLO alone, despite more severe arthritis at surgery

The medial meniscus: what it is and why it is at risk

The medial meniscus is a crescent-shaped fibrocartilage structure on the inner surface of the stifle joint. It distributes joint load, provides shock absorption, and stabilizes the joint during weight bearing.

Each stifle has two menisci. The medial is injured far more frequently because it is firmly attached to the tibia and cannot shift away from the abnormal tibial movement during CCL rupture.

SustainableVet.org confirms: the medial meniscus is more prone to injury because it is firmly attached to the tibia. When the tibia slides forward, it is compressed by the femoral condyle.

Why meniscal tears occur after TPLO

Latent tears missed at surgery

At the time of TPLO, the surgeon examines the meniscus through a small arthrotomy or arthroscopy and removes any clearly damaged tissue. However, not all tears are visible at surgery.

Small partial-thickness tears or areas of early degeneration may not be identifiable intraoperatively but progress to complete tears in the weeks or months after surgery.

PMC confirms: post-surgical meniscal pathology may be due to failure of diagnosis at the time of surgery (latent tears) or a result of residual joint instability (post-liminary tears).

Residual joint instability after TPLO

TPLO eliminates the cranial shear force that destabilized the joint. However, the stifle undergoes significant remodeling in the weeks after surgery, and some residual instability may persist during this period.

This can subject a structurally weakened meniscus to loading forces that produce tearing.

SustainableVet.org confirms: meniscal tears after TPLO can occur due to ongoing joint instability before surgery, direct trauma, or degenerative changes.

Progressive degeneration

Older dogs are at higher risk for meniscal tears because the meniscus undergoes age-related degeneration -- loss of collagen fiber organization, reduced cell density, and decreased water content.

PMC confirms: increasing age is a risk factor for medial meniscal tear; the meniscus experiences oxidative stress and abnormal matrix organization that can lead to injury under normal loading forces.

Concurrent vs. late meniscal tears

Concurrent (primary) tears

These are meniscal tears present at the time of TPLO and treated during the original surgery. PubMed data found a concurrent meniscal tear prevalence of 32.2% in dogs undergoing TPLO.

These are removed at the time of the procedure via arthrotomy or arthroscopy.

Late (secondary) tears

These are meniscal tears that develop after TPLO in a previously intact or adequately treated meniscus. The PubMed TPLO arthroscopy study found a late meniscal tear incidence of 5.6%.

RCVS Canine Cruciate Registry confirms late meniscal tears are seen in 2 to 22% of cases.

SustainableVet.org confirms: a secondary meniscus tear often happens weeks or months after the initial procedure and results in immediate pain, limping, and reluctance to move.

Symptoms of a post-TPLO meniscal tear

Sudden lameness regression: the most characteristic sign. A dog making steady progress suddenly becomes lame on the operated leg. This is distinct from the gradual variability of normal TPLO recovery.

Audible or palpable meniscal click: a clicking or popping sound during stifle flexion and extension. SustainableVet.org confirms the knee may produce a clicking sound when moving. The click is heard when the torn meniscal flap is displaced by the femoral condyle.

Pain on stifle manipulation: the dog flinches, vocalizes, or resists when the stifle is flexed through its range. This distinguishes pain from benign mechanical clicking.

Stifle swelling: joint effusion may increase from the baseline level. The joint feels fuller and may be warmer than the contralateral stifle.

Reluctance to bear weight: the dog shifts weight off the operated leg, holds the leg up, or toe-touches only.

SustainableVet.org confirms: symptoms include a sudden return of lameness, difficulty bearing weight, or a clicking or popping sound when the knee moves; dogs may yelp when standing or walking.

Diagnosis

Veterinary evaluation includes:

Physical examination: stifle manipulation to assess pain, range of motion, joint effusion, and presence of a palpable meniscal click. The McMurray-type maneuver and medial meniscal compression test are used to localize meniscal pain.

Radiographs: assess joint effusion (fat pad displacement), osteotomy healing, and implant position. Radiographs do not directly image the meniscus but rule out implant complications as the cause of lameness.

Arthroscopy or arthrotomy: definitive diagnosis. Direct visualization of the meniscus under anesthesia identifies the location, type, and severity of the tear.

Treatment

Conservative management

Small or partial-thickness tears without significant clinical signs can be managed conservatively with:

• NSAIDs for 4 to 8 weeks
• Strict activity restriction
• Joint supplements (omega-3 fatty acids, glucosamine, chondroitin)
• Reassessment if signs do not resolve

SustainableVet.org confirms: small tears may be managed with rest, NSAIDs, and joint supplements; but severe cases often require surgical intervention.

Partial meniscectomy

The definitive treatment for complete or symptomatic meniscal tears. The surgeon removes the damaged portion of the meniscus arthroscopically or via a small arthrotomy, leaving the undamaged portion intact.

The outcomes of partial meniscectomy are excellent. PubMed confirms: all dogs with late meniscal tears treated by partial meniscectomy returned to peak postoperative limb function based on client-assessed outcomes.

AVMA research confirms: treatment for meniscal tear results in significant improvement in lameness, with postoperative outcomes at 6 months comparable to dogs with intact menisci.

RCVS confirms: meniscal tears are treated by removing the torn portion. Dogs with long-term meniscal tears have a bit more osteoarthritis but generally maintain a good quality of life.

Post-meniscectomy recovery

Recovery after partial meniscectomy is typically faster than the original TPLO recovery. The osteotomy is already healed; the additional recovery is for the joint to settle after the meniscectomy.

Most dogs return to normal activity within 4 to 8 weeks.

For the clicking guide, see why is my dog's leg clicking after TPLO surgery?. For the lameness guide, see lameness after TPLO surgery in dogs.

For the infection signs guide, see earliest signs of TPLO infection. For the TPLO complications guide, see 15 common complications after TPLO surgery.

Frequently asked questions

How do I know if it is a meniscal tear or normal recovery variability?

The key is trajectory. Normal recovery shows week-over-week improvement with occasional minor setbacks. A meniscal tear produces a clear regression: the dog was improving, then suddenly lame.

If your dog has been consistently improving and then becomes acutely lame, contact your vet the same day.

Can a meniscal tear be seen on X-ray?

No. Radiographs cannot image cartilage. X-rays assess bone, implant, and joint effusion. A suspected meniscal tear requires arthroscopy or an MRI (less common in veterinary practice) for definitive diagnosis.

Will my dog need another general anesthetic for the meniscectomy?

Yes. Arthroscopy or arthrotomy for partial meniscectomy requires general anesthesia. The procedure is typically shorter than the original TPLO and recovery is faster because the plate and osteotomy are already healed.

Is there anything that could have been done to prevent this?

Not reliably. The risk of late meniscal tears is partly structural (inherent joint instability during healing), partly degenerative (pre-existing meniscal weakness), and partly age-related.

Strict activity restriction during recovery reduces the risk by minimizing the abnormal joint loading that can damage a weakened meniscus, but it cannot eliminate risk entirely.

My dog had a concurrent meniscal tear treated at the time of TPLO. Is the outcome worse?

No.

AVMA research confirms similar midterm functional outcomes for TPLO plus meniscectomy vs TPLO alone in dogs with intact menisci.

Resources

• RCVS Canine Cruciate Registry. Meniscal Tears. ccr.rcvsknowledge.org
• PubMed. Incidence of Medial Meniscal Tears After Arthroscopic Assisted TPLO. pubmed.ncbi.nlm.nih.gov
• AVMA Journals. Concurrent Bucket Handle Meniscal Tear Treated with Arthroscopic Partial Meniscectomy Does Not Influence Midterm Outcomes After TPLO. avmajournals.avma.org
• PMC. Associations Between Meniscal Tears and Osteoarthritis Among Dogs Undergoing TPLO. pmc.ncbi.nlm.nih.gov

Some redness around a TPLO incision is a completely normal part of healing.

The skin and underlying tissues respond to any surgical trauma with an inflammatory response redness is one of the visible signs of that response.

The question is always: is this normal healing redness, or is this infection?

Quick answer: Mild redness at the TPLO incision is normal for 2 to 3 days, fading over 1 to 2 weeks. Call your vet if redness spreads, is warm, produces discharge, worsens after day 3, or your dog develops fever.

Key takeaways

• Mild redness at the incision is normal for 2 to 3 days post-surgery: it should be fading by day 3 to 5
• Normal redness is localized to the incision line: redness spreading outward from the wound edge is not normal
• Infection redness is spreading, warm, and accompanied by discharge: these features together require veterinary evaluation
• Suture reaction redness is localized and itchy: the pattern is different from infection and typically resolves after suture removal
• Licking is the most preventable wound complication: saliva introduces bacteria; the E-collar must stay on until suture removal
• Redness after week 2 warrants veterinary evaluation: new redness after day 14 suggests a complication

Normal redness after TPLO surgery

The inflammatory phase of wound healing is the body's first response to surgical trauma. Blood flow increases to the wound, bringing immune cells and clotting factors.

This increased blood flow makes the skin appear pink or faintly red. This is expected and necessary for healing.

SustainableVet.org confirms: normal redness after TPLO surgery is usually mild and limited to the incision area. It should improve daily as the wound heals.

Characteristics of normal healing redness:

• Confined to the immediate edges of the incision not spreading outward
• Mild pale pink to light red, not deep red or purple
• Decreasing over time improving from day 3 onward
• Not warm to the touch (normal healing generates mild local warmth, but not the significant heat of infection)
• No discharge from the wound other than possibly a small amount of serum in the first 24 to 48 hours
• The dog is not bothered by gentle examination of the area

The redness typically peaks at 48 to 72 hours post-surgery and should be noticeably fading by the end of the first week.

Abnormal redness: signs of infection

Infection redness is different from normal healing redness in several characteristic ways:

Spreading: the redness extends outward from the incision margin into the surrounding skin. This cellulitis pattern spreading red discoloration in surrounding tissue is a sign that bacteria are spreading through the tissue planes.

Warmth: the infected area feels significantly warmer than surrounding skin or the opposite leg. Infection drives significant local heat through the inflammatory cytokine response.

Discharge: infected wounds produce discharge that may be clear-to-yellow early, progressing to yellow-green, cloudy, or frankly purulent. Foul odor is a hallmark of anaerobic bacterial involvement.

Worsening, not improving: normal redness fades. Infected redness intensifies. If redness is worse at day 5 than at day 2, infection is strongly suspected.

Systemic signs: fever (rectal temperature above 102.5 F), lethargy, loss of appetite, and reluctance to bear weight alongside redness suggest the infection is causing systemic effects.

SustainableVet.org confirms: infection risk includes bacteria entering the incision, causing redness that worsens along with discharge or odor.

The TPLO incision infection guide confirms: infection risk occurs in approximately 3 to 10% of TPLO cases. Signs of infection include redness, swelling, warmth, discharge, and delayed healing.

Other causes of post-TPLO redness

Suture or staple reaction

Some dogs develop a local inflammatory reaction to the suture material more commonly with older suture types or in dogs with sensitive skin.

This produces redness specifically along the suture line, often with mild swelling and sometimes itching (prompting the dog to lick or chew at the site).

It is localized, does not produce the spreading pattern of infection, and typically resolves after suture removal.

Contact dermatitis

Redness from a reaction to bandage material, antiseptic solution applied to the wound, or topical medications can mimic early infection. The pattern follows the contact area rather than the wound edge.

Seroma formation

A seroma that presses against the overlying skin may cause mild skin discoloration and the appearance of redness over the fluid-filled swelling. The area is soft, fluctuant, and typically not warm.

For the full seroma guide, see seroma in dogs after TPLO surgery.

What to do if you notice redness

First 3 days: normal range

Monitor daily. Take a photograph to track progression. Ensure the E-collar is on at all times. Check that no discharge or spreading is occurring.

Days 3 to 10: should be improving

If redness is not clearly fading by day 5 to 7, contact your veterinarian.

Photograph the wound to share with the vet by phone or telehealth before deciding whether an in-person visit is needed.

Do not apply any topical products to the wound without veterinary guidance antiseptics can delay healing and worsen skin reaction.

After day 10: any new or persistent redness needs evaluation

By day 10 to 14, most surgical incisions are well into the proliferative healing phase.

Persistent redness at this stage, or new-onset redness that was not present before, warrants a veterinary appointment rather than home monitoring.

Incision care during recovery

• Keep the incision dry: no bathing, no swimming, no wet grass
• E-collar on at all times until sutures are removed (typically day 10 to 14)
• Check the wound twice daily: look at it, do not touch it unless instructed
• No ointments or antiseptics unless specifically prescribed
• Contact your vet before applying anything to the wound

For the incision infection guide with full symptom detail, see TPLO incision infection symptoms and prevention. For the full complications reference, see 15 common complications after TPLO surgery in dogs.

For the seroma guide (fluid that can cause discoloration), see seroma in dogs after TPLO surgery. For the full TPLO recovery guide, see what to expect after TPLO surgery in dogs.

Frequently asked questions

How do I know if my dog's incision redness is normal?

Normal redness is mild, pink, confined directly to the wound edges, and fading by day 3 to 5.

Abnormal redness is spreading outward from the incision, deepening in color, warm to the touch, or accompanied by discharge or odor. If you are unsure, photograph the wound and contact your veterinarian.

My dog's incision looks red and my dog keeps licking it. What should I do?

Replace or refit the E-collar immediately if the dog has been reaching the wound. Even a few minutes of licking introduces bacteria.

Examine the wound for any discharge, spreading redness, or wound breakdown. If you see any of these, contact your vet the same day.

If the wound looks intact, continue monitoring closely with the E-collar secured.

Can redness appear weeks after surgery?

Yes. Late-onset redness appearing 2 to 6 weeks post-surgery often signals a developing infection rather than normal healing.

Common causes include low-grade suture infection, developing seroma, or a bacterial infection that has been slowly progressing. Any new redness appearing after the initial 2-week healing phase warrants veterinary evaluation.

Is red skin around the TPLO staples normal?

A small amount of mild pinkness immediately at the staple insertion points is normal.

Spreading redness between staple sites, significant swelling along the staple line, or discharge from staple holes is not normal and requires veterinary evaluation before the scheduled staple removal visit.

What happens if redness from infection is left untreated?

Superficial infections can progress to deeper tissue infections, then to implant-associated infections and osteomyelitis.

Laguna Hills Animal Hospital confirms that even superficial soft tissue infections have been shown to progress to implant infections and bone infections when not treated promptly and appropriately.

Resources

• SustainableVet. TPLO Incision Infection Symptoms and Prevention. sustainablevet.org
• Dial A Vet. Redness and Swelling Around TPLO Incision. dialavet.com
• Laguna Hills Animal Hospital. TPLO Surgery Complications. lhah.com
• VCA Animal Hospitals. Tibial Plateau Leveling Osteotomy (TPLO) in Dogs. vcahospitals.com

TPLO is the most commonly performed surgery for CCL rupture in dogs and the most commonly misunderstood.

Misconceptions about TPLO cause unnecessary hesitation, lead some owners to choose inferior alternatives, and create unrealistic expectations about recovery.

This guide addresses the 10 most common myths directly -- with evidence-based clarification for each.

Quick answer: The most persistent TPLO myths: that dogs can manage without surgery, that TPLO is only for large breeds, that recovery takes a few weeks, that the plate must be removed after healing, and that TPLO prevents arthritis. All are false. TPLO has a 90 to 95% success rate.

Key takeaways

• Myth: "My dog can heal without surgery": dog knee anatomy differs fundamentally from human; without surgery, severe OA, meniscal tearing, and chronic lameness are expected in most dogs over 15 kg
• Myth: "TPLO is only for large dogs": SustainableVet.org confirms TPLO is just as effective for small and toy breeds; the biomechanical correction is appropriate regardless of size
• Myth: "Recovery only takes a few weeks": bone healing takes 8 to 12 weeks; full muscle recovery takes 4 to 6 months; 8 to 12 weeks is the minimum restriction period
• Myth: "The plate needs to be removed after healing": the TPLO plate is designed to be permanent; removal is only performed when complications arise
• Myth: "TPLO prevents arthritis": all CCL-affected stifles develop progressive OA regardless of surgical technique; TPLO reduces OA progression but does not prevent it
• Myth: "Dogs are in severe pain after TPLO": SustainableVet.org confirms this is a misconception; modern multi-modal pain management controls post-surgical pain effectively

Myth 1: "My dog can heal without surgery"

The truth: dogs and humans have fundamentally different knee anatomy. In humans, the flat tibial plateau and strong surrounding musculature allow some CCL tears to be managed conservatively with physical therapy and bracing. In dogs, the tibial plateau slopes steeply downward, generating a cranial shear force that the absent CCL cannot resist. Without surgical correction of this force, the joint remains mechanically unstable with every weight-bearing step.

TPLO Info confirms: dogs and humans respond very differently to CCL tears. Without surgery, severe OA can develop, meniscal tearing can occur, and other side effects may be present.

Conservative management (strict rest, weight management, joint supplements, physical therapy) can provide temporary improvement, particularly in small dogs and partial tears.

For most dogs over 15 kg with complete CCL rupture, conservative management does not restore normal joint stability, and progressive lameness, OA, and joint deterioration are the expected outcome.

Who can be managed conservatively?

• Very small dogs (under 10 to 15 kg) with partial tears and low activity levels
• Dogs with significant comorbidities where anesthetic risk outweighs surgical benefit
• Owners who decline surgery after being fully informed of expected outcomes

For all other dogs -- medium and large breeds, young dogs, active dogs, complete ruptures -- surgery produces substantially better outcomes than conservative management.

Myth 2: "TPLO is only for large dogs"

The truth: TPLO was originally developed for large and giant breeds because they were the most severely affected by CCL disease and the most poorly served by lateral suture stabilization. But TPLO corrects the underlying biomechanical problem (excessive tibial plateau angle) in any dog, regardless of size.

SustainableVet.org confirms: TPLO was initially developed for large dogs due to biomechanical challenges, but has been found just as effective for small and toy breeds.

For small dogs, both TPLO and lateral suture stabilization can achieve good outcomes.

The decision for a small dog should be based on the dog's TPA, activity level, and individual assessment -- not a blanket assumption that TPLO is unnecessary.

Myth 3: "TPLO recovery only takes a few weeks"

The truth: bone healing takes 8 to 12 weeks. This is the period of activity restriction. But bone healing and functional recovery are not the same thing. Full muscle rebuilding and joint function restoration takes 4 to 6 months from surgery.

Canada Vet Express confirms: recovery is gradual; most dogs begin walking within a few days and return to normal activity within 3 to 4 months with proper care.

The 8 to 12 week bone healing timeline means:

• Activity restrictions are in place for 8 to 12 weeks minimum
• Radiographic confirmation of healing is required before restrictions are lifted
• Progressive return to full activity follows the radiographic clearance

After restrictions are lifted, the operated leg continues to rebuild strength and coordination for months. For sport dogs and working dogs, the return-to-sport protocol extends to 7 to 9 months from surgery.

Myth 4: "The TPLO plate needs to be removed after the bone heals"

The truth: the plate is designed to remain in place permanently. It does not need to be removed when the osteotomy heals. Routine plate removal is not standard practice in veterinary orthopedics.

SustainableVet.org confirms: these implants are meant to stay in place permanently, but in rare cases they can cause problems; removal is only performed when complications arise.

When plate removal is performed:

• Deep implant-associated infection requiring source removal
• Implant failure (breakage, loosening causing instability)
• Persistent implant irritation producing clinical lameness specifically attributable to the plate

In the vast majority of dogs, the plate is never removed. It remains in place for life with no adverse effects.

Myth 5: "TPLO prevents arthritis"

The truth: TPLO reduces and slows arthritis progression. It does not prevent it. All CCL-affected stifles develop progressive OA regardless of surgical technique or outcome.

SustainableVet.org confirms: mild arthritis is expected even in successful cases.

Published long-term data (TPLO Info, citing long-term retrospective studies) confirms moderate but significant OA progression in all TPLO cohorts with follow-up extending to 6.8 years.

TPLO produces substantially less OA progression than TTA or lateral suture stabilization, but OA progression is universal.

The appropriate expectation: TPLO minimizes OA development and clinical impact. Long-term management (weight management, exercise modification, joint supplements, and periodic NSAID use for flares) is required in all TPLO dogs.

Myth 6: "Dogs are in severe pain after TPLO"

The truth: modern veterinary anesthesia and pain management protocols produce well-controlled post-operative pain in TPLO dogs. Dogs typically begin bearing some weight within 24 to 48 hours. Pain that is not controlled is a clinical problem requiring medication adjustment -- not an expected feature of TPLO recovery.

SustainableVet.org confirms: it is a misconception that dogs experience severe pain after TPLO surgery; modern multi-modal pain management controls post-surgical pain effectively.

Post-operative pain management typically includes: NSAIDs (carprofen, meloxicam), gabapentin, opioids during hospitalization, local anesthetic nerve blocks at surgery.

Dogs in adequate pain control rest comfortably, bear some weight within days, and show appetite by day 3.

Uncontrolled post-operative pain (dog cannot settle, crying, refuses all weight bearing beyond day 3) indicates a need for pain medication adjustment -- contact your vet rather than accepting it as inevitable.

Myth 7: "TPLO is too risky for most dogs"

The truth: TPLO has a 90 to 95% success rate. The complication rate across all studies is 10 to 34%, but the vast majority of complications are minor (superficial infection, seroma, mild swelling). Serious complications requiring revision surgery occur in fewer than 10% of cases.

Dispomed confirms: overall complication rates are 14 to 34%, but a second surgery is required in less than 10% of cases.

No surgery is without risk.

But for a dog with a torn CCL, the risk of TPLO is substantially lower than the certainty of progressive joint deterioration, pain, and reduced quality of life without surgical treatment.

Myth 8: "TPLO is only for show dogs or working dogs"

The truth: TPLO is appropriate for any dog with CCL rupture that will benefit from restored joint stability -- including middle-aged household pets with no competitive goals.

SustainableVet.org confirms: some pet owners mistakenly believe that TPLO surgery is only for show dogs or high-performance athletes; this is not true; TPLO benefits any dog with CCL disease.

The goal of TPLO is freedom from joint pain and restored ability to perform normal daily activities -- walking, playing, using stairs, sitting and rising comfortably.

These are benefits for every dog, not just sport dogs.

Myth 9: "All dogs with CCL tears need TPLO immediately"

The truth: TPLO is not always an emergency. The timing of surgery should be guided by the veterinary assessment. Partial tears in small dogs may be monitored with conservative management. Dogs with significant concurrent illness may benefit from medical optimization before surgery. The appropriate goal is surgical timing that optimizes anesthetic risk and surgical conditions, not surgical urgency at any cost.

SustainableVet.org confirms: while TPLO surgery is the best treatment for CCL tears, it isn't necessary for every case; for mild or partial tears in less active dogs, alternatives can be effective.

However, in dogs with complete rupture, particularly larger breeds, delay generally produces worse outcomes as OA progresses and the meniscus is exposed to ongoing mechanical insult from the unstable joint.

Myth 10: "If TPLO fails, the dog will never recover"

The truth: most TPLO complications are treatable. Superficial infections resolve with antibiotics. Late meniscal tears are treated with partial meniscectomy. Implant failures can be revised. Osteomyelitis, the most challenging complication, requires prolonged treatment but is often successfully managed.

SustainableVet.org confirms: revision TPLO surgery can be performed if the initial procedure fails; this may involve removing or replacing implants, repositioning the tibial cut, or addressing infections.

The critical factor in outcome from a complication is early detection and prompt treatment. Most complications that are identified and treated early resolve without long-term sequelae.

For the full TPLO overview, see what is TPLO surgery in dogs?. For the success rate data, see TPLO failure rate in dogs. For recovery, see what to expect after TPLO surgery.

For alternatives, see alternatives to TPLO surgery for dogs.

Frequently asked questions

Is TPLO actually the best treatment for CCL rupture?

For most dogs over 15 to 20 kg, TPLO is the most evidence-supported surgical option, producing the highest rates of long-term function and owner satisfaction in the published literature.

For small dogs, lateral suture stabilization achieves comparable results at lower cost. The choice depends on the individual dog's size, activity level, TPA, and health status.

Can I wait and see how my dog does without surgery?

You can choose conservative management.

The expected outcome in most dogs over 15 kg with complete CCL rupture who do not have surgery is progressive lameness, rapidly advancing OA, ongoing meniscal damage, and reduced quality of life.

Early surgical intervention consistently produces better long-term outcomes than delayed or non-surgical management.

Is the recovery really as strict as described?

Yes. The restriction protocol exists because the plate holds the osteotomy until new bone consolidates -- a process that takes 8 to 12 weeks regardless of how well the dog appears.

A single running or jumping episode before healing is confirmed can displace the plate and require revision surgery.

Will my dog be the same dog after TPLO?

Most owners report their dog is effectively the same dog -- or better than before the CCL rupture -- within 6 to 12 months of surgery.

The 90 to 95% success rate reflects a high proportion of dogs returning to their previous activity level.

Some dogs develop mild age-related stiffness years later as OA progresses, but this is manageable with appropriate care.

Does TPLO cure the CCL problem permanently?

TPLO permanently corrects the biomechanical cause of CCL-related instability in the operated stifle. It does not repair or replace the CCL -- it makes the CCL unnecessary.

It does not prevent CCL disease in the contralateral stifle.

Resources

• SustainableVet. Common Myths About TPLO Surgery Explained. sustainablevet.org
• TPLO Info. 5 Misconceptions About TPLO Surgery. tploinfo.com
• Dispomed. TPLO Surgery in Dogs: Success Rates and Alternatives. dispomed.com
• ACVS. Cranial Cruciate Ligament Disease. acvs.org