TPLO surgery requires general anesthesia that is tailored to the individual patient. For most healthy adult dogs, TPLO anesthesia is straightforward and low-risk.

For older dogs, obese dogs, or those with concurrent medical conditions, the anesthetic plan requires additional planning.

Understanding what the protocol involves helps owners know what to expect and how to prepare their dog.

Quick answer: TPLO anesthesia includes a preoperative blood panel; premedication with an opioid and sedative; induction with propofol or alfaxalone; maintenance with isoflurane or sevoflurane; continuous monitoring; and multimodal pain management including NSAIDs, nerve blocks (sciatic/femoral or epidural), and post-operative opioids.

Key takeaways

• Preoperative blood work is standard for all TPLO patients: CBC and biochemistry identify organ dysfunction and conditions that increase anesthetic risk
• TPLO anesthesia is multimodal: combining opioids, NSAIDs, nerve blocks, and inhalant anesthetic reduces total drug doses and improves pain control
• Nerve blocks are now standard in TPLO anesthesia: femoral and sciatic blocks with bupivacaine reduce post-operative opioid requirements
• A published feasibility study achieved total opioid-free post-operative analgesia in TPLO dogs using nerve blocks, ketamine, isoflurane, and meloxicam
• Epidural analgesia reduces post-operative opioid requirements by 36% compared to no epidural, per PMC study data
• Food is withheld 8 to 12 hours before surgery to reduce aspiration risk; water restriction is typically shorter

Pre-anesthetic assessment

Every dog undergoing TPLO is evaluated before anesthesia to identify risk factors and optimize the anesthetic plan.

Physical examination: body weight, cardiovascular and respiratory status, mucous membrane color and capillary refill, hydration status, and assessment of concurrent conditions.

Blood work: complete blood count (CBC) detects anaemia, infection, and platelet abnormalities. Biochemistry panel assesses kidney function (creatinine, BUN), liver function (ALT, ALP, bilirubin), blood glucose, and electrolytes. These results determine anesthetic drug selection and guide fluid therapy.

ASA classification: anesthesiologists use the American Society of Anesthesiologists (ASA) physical status classification (1 to 5) to communicate overall health status. Most TPLO patients are ASA class 1 (healthy) or 2 (mild systemic disease). Dogs with significant cardiac, renal, or hepatic disease may be ASA 3 or higher and require additional monitoring or modified protocols.

Premedication

Premedication is given 20 to 40 minutes before induction.

It serves to calm the dog, reduce anxiety, provide early analgesia (preemptive analgesia), reduce the amount of induction and maintenance agent required, and make induction smoother.

Opioids (most common premedication component for TPLO):

• Hydromorphone: commonly used as a premedication; the PubMed perioperative analgesia study used hydromorphone plus acepromazine as premedication in all 56 TPLO dogs
• Methadone: provides both opioid analgesia and NMDA receptor antagonism; commonly used as a premedication in many European centres
• Morphine: used in some protocols, particularly when combined with epidural administration

Sedatives:

• Acepromazine: a phenothiazine tranquilizer that provides reliable sedation; use is reduced in patients with cardiovascular compromise due to vasodilatory effects
• Medetomidine or dexmedetomidine: alpha-2 agonists providing sedation, analgesia, and muscle relaxation; used in the opioid-free feasibility protocol (PMC 2024)
• Midazolam: benzodiazepine used particularly in geriatric or debilitated dogs for its minimal cardiovascular effects

Anesthetic induction

Induction agents produce rapid unconsciousness, allowing placement of an endotracheal tube for airway control.

Propofol: the most commonly used induction agent in healthy dogs. Provides smooth, rapid induction with a short duration, making induction-to-intubation management easy.

Alfaxalone: a neuroactive steroid with a similar profile to propofol. Used in some protocols as an alternative, particularly in smaller dogs or where propofol is not available.

Ketamine + midazolam: used in some protocols as an alternative induction combination, particularly when some degree of analgesia is desired at induction. Also used in opioid-sparing protocols.

Intraoperative maintenance

Inhalant anesthetics (isoflurane or sevoflurane) are delivered via endotracheal tube to maintain unconsciousness throughout the surgery.

Isoflurane is the most widely used agent in veterinary anaesthesia for TPLO. Sevoflurane provides faster recovery but is more expensive. Both are effective.

IV constant rate infusions (CRI) during surgery augment inhalant anesthesia and reduce inhalant requirements:

• Ketamine CRI: used in opioid-sparing protocols; the PMC feasibility study used ketamine CRI at 0.6 mg/kg/h throughout surgery
• Morphine-lidocaine-ketamine (MLK CRI): a well-established combination providing balanced intraoperative analgesia with reduced inhalant requirements
• Fentanyl CRI: an opioid CRI providing titratable intraoperative analgesia

Regional analgesia (nerve blocks)

Nerve blocks have become a key component of TPLO anesthesia because they provide superior post-operative pain control compared to systemic opioids alone.

Femoral and sciatic nerve blocks (FSNB): block the main sensory nerves to the stifle joint and hind limb. Performed before surgery with bupivacaine. PMC research comparing nerve blockade approaches for TPLO confirms that femoral and sciatic nerve blocks provide superior postoperative analgesia compared to IV CRI alone.

Lumbosacral epidural: injection of morphine and bupivacaine into the epidural space. PMC data (epidural + liposomal bupivacaine study) found epidural analgesia produced 36% fewer post-operative opioid injections compared to no epidural.

Intra-articular injection: bupivacaine injected directly into the stifle joint before or after surgery. Used as an alternative or supplement to nerve blocks in some protocols.

Intraoperative monitoring

Standard TPLO monitoring includes:

• ECG: continuous heart rate and rhythm monitoring
• Pulse oximetry (SpO2): peripheral oxygen saturation
• Capnography (end-tidal CO2): assesses ventilation adequacy; dogs are often placed on mechanical ventilation during TPLO
• Blood pressure: direct arterial or indirect Doppler/oscillometric
• Temperature: hypothermia is a common complication of long anesthetic events; warming devices are used routinely
• Depth of anesthesia assessment: clinical signs including eye position, jaw tone, and response to surgical stimulation

Post-operative pain management

TPLO is a significant orthopedic procedure and post-operative pain management directly affects recovery quality and rate of return to function.

NSAIDs: meloxicam or carprofen are administered in the peri-operative period and continued at home for 7 to 14 days minimum. The PMC opioid-free protocol administered meloxicam 0.2 mg/kg IV intraoperatively.

Opioids: hydromorphone or buprenorphine for 24 to 48 hours post-operatively, reducing as the nerve block wears off and NSAID analgesia covers the residual pain.

Gabapentin: increasingly prescribed for the first 1 to 2 weeks post-operatively to address neuropathic pain components associated with the surgical trauma and healing nerve tissues.

For the full recovery guide and what to expect after waking up, see what to expect after TPLO surgery in dogs.

For the leg shaking guide that often relates to anesthetic recovery, see dog leg shaking after TPLO surgery.

For the incontinence guide related to catheterization and anesthesia effects, see dog incontinence after TPLO surgery. For the post-surgical pain guide, see dog whining after TPLO surgery: causes and care.

Frequently asked questions

Is TPLO anesthesia safe for dogs?

For healthy adult dogs, TPLO anesthesia is considered low-risk. The most significant risks involve cardiovascular depression from the anesthetic agents and hypothermia during the procedure.

These are managed through continuous monitoring and supportive care. Pre-anesthetic blood work identifies dogs with conditions that increase risk.

How long is the dog under anesthesia for TPLO?

Total anesthesia time typically ranges from 1.5 to 2.5 hours for a standard TPLO, depending on the surgeon's experience and any complications.

Dogs are usually extubated within 15 to 30 minutes of the end of surgery as they recover consciousness.

What happens if my dog is in pain when it wakes up from TPLO?

Post-operative pain assessment is performed by the veterinary team as the dog recovers. Rescue analgesia (additional opioid doses) is given if pain scores exceed defined thresholds.

The goal of the multimodal protocol is to prevent pain peaks rather than treat pain after it occurs.

Contact the surgical team if your dog appears to be in significant pain after discharge.

My dog is older. Is anesthesia more dangerous?

Age increases anesthetic risk because older dogs are more likely to have subclinical cardiac, renal, or hepatic disease, slower drug metabolism, and reduced physiological reserve.

Thorough pre-anesthetic bloodwork and cardiac assessment (chest X-ray, echocardiogram in selected cases) helps quantify risk. The anesthetic team adjusts protocols for older patients with reduced drug doses and enhanced monitoring.

What does fasting before TPLO mean?

Food is typically withheld for 8 to 12 hours before anesthesia to reduce the risk of vomiting and aspiration during induction or recovery.

Water restriction is typically shorter often until the night before or only 2 to 4 hours before surgery.

Follow your surgeon's specific instructions, which are tailored to your dog's size and health status.

Resources

• PMC. Postoperative Opioid-Free Analgesia in Dogs Undergoing TPLO: A Feasibility Study. pmc.ncbi.nlm.nih.gov
• PMC. Incidence of Postoperative Opioids in TPLO Dogs After Liposomal Bupivacaine With or Without Morphine Epidural. ncbi.nlm.nih.gov
• PubMed. Comparison of Perioperative Analgesic Protocols for Dogs Undergoing TPLO. pubmed.ncbi.nlm.nih.gov
• PMC. Effects of Saphenous and Sciatic Nerve Blocks, Lumbosacral Epidural or MLK CRI on Postoperative Pain in TPLO Dogs. pmc.ncbi.nlm.nih.gov
• VCA Animal Hospitals. Tibial Plateau Leveling Osteotomy (TPLO) in Dogs. vcahospitals.com

Before performing TPLO surgery, the veterinary surgeon selects the appropriate bone plate from a range of sizes specific to the implant system being used.

The plate size chart is the reference tool that guides this selection.

Choosing the correct plate is as important as the surgical technique itself an undersized plate risks mechanical failure, and an oversized plate may not fit the tibial anatomy correctly.

Quick answer: The TPLO plate size chart matches body weight and tibial bone dimensions to the appropriate implant. Arthrex plates range from 2.0 mm to 4.5 mm; Synthes covers a similar range. Tibial width is measured on preoperative radiographs and used alongside body weight to select the plate and screw configuration.

Key takeaways

• The plate size chart is a preoperative planning tool that matches body weight and bone dimensions to the appropriate implant
• Arthrex offers TPLO plates from 2.0 mm to 4.5 mm: the small sizes are purpose-designed for small breed anatomy, not scaled-down large plates
• Tibial width is measured on preoperative radiographs: a primary determinant of plate selection alongside body weight
• Plate selection is system-specific: Arthrex plates require Arthrex instruments and screws; Synthes requires Synthes-specific tools
• The plate is single-use sterile: a new plate must be available if a different size is needed intraoperatively
• Correct plate selection directly affects outcomes: undersized plates risk fatigue fracture; oversized plates cause soft tissue irritation

What the plate size chart does

The TPLO plate size chart is a lookup reference similar in function to the rotation chart and weight chart that are part of the Arthrex and Synthes TPLO planning systems.

It takes known inputs (primarily body weight and tibial dimensions measured on radiographs) and outputs the recommended plate size from the manufacturer's product range.

SustainableVet.org explains: a TPLO plate size chart is a reference guide used by veterinary surgeons to select the appropriate implant size for stabilizing the tibia after TPLO surgery.

Plates come in various lengths and hole numbers to fit different dog breeds and bone sizes.

The chart removes the guesswork from a decision that significantly affects the mechanical performance of the repair.

A plate that is correctly sized distributes load evenly across all screw holes and lies flush against the cortical bone surface, minimizing stress risers and soft tissue irritation.

Key variables in plate size selection

Body weight

Body weight is the primary initial filter. Heavier dogs generate higher joint forces and require larger, stiffer plates to withstand the loads applied during weight-bearing and normal activity.

General size categories used across Arthrex and Synthes product lines:

• Small breed (under 10 to 15 kg): 2.0 mm or 2.4 mm plates
• Medium breed (15 to 30 kg): 3.5 mm plates
• Large breed (30 to 50 kg): 3.5 mm or 4.5 mm plates
• Giant breed (over 50 kg): 4.5 mm plates; locking systems particularly important

These ranges are approximate and surgeon-dependent. The specific manufacturer chart values take precedence over general categories.

Tibial width and bone dimensions

The plate must span the osteotomy site with at least 2 screws proximal and 2 screws distal to the cut for adequate fixation.

The tibial width at the planned osteotomy level measured in millimeters on a mediolateral radiograph determines which plate length and screw configuration provides sufficient purchase without overhanging the bone margins.

Number of screw holes

Plates are available with different numbers of holes (typically 4, 5, or 6 holes for standard sizes).

More holes provide more screw fixation points, which is important in larger dogs or those expected to be highly active during recovery.

SustainableVet.org notes: plates come in various lengths and hole numbers to fit different dog breeds and bone sizes, allowing surgeons to select the configuration that best matches each individual patient's anatomy.

Arthrex TPLO plate system

Arthrex produces the most widely used TPLO locking plate system in the United States. The Arthrex TPLO Locking Plate System is designed with specific anatomical features to facilitate consistent plate placement.

From Arthrex Vet Systems documentation: the 2.0 mm and 2.4 mm TPLO locking plates are not simply shrunken versions of larger TPLO plates.

The smaller plates were purpose-designed for small breed bone anatomy.

Small dogs have proportionally different tibial geometry, and scaling down a large plate does not optimize screw angle or load distribution.

Arthrex's 4.5 mm plate incorporates a caudal tilt designed for improved screw purchase in the proximal tibial segment, with a proximal screw trajectory directed to avoid the osteotomy line.

This is an important design feature: screws that inadvertently cross the osteotomy reduce fixation quality and risk creating a stress concentration at the cut.

The Arthrex system includes an InternalBrace ligament augmentation option for dogs with severe stifle instability. This knotless lateral stabilization technique is not part of standard TPLO.

For the Arthrex plate overview, see Arthrex TPLO plate overview and use. For the Synthes plate overview, see Synthes TPLO plate overview and use.

How the plate size chart integrates with other planning tools

The plate size chart is used in concert with two other charts in the preoperative planning sequence:

Rotation chart: determines how many degrees the tibial segment must be rotated to achieve the target postoperative TPA of approximately 5 degrees. This is completed using the preoperative TPA measurement from radiographs.

Weight chart: guides post-operative weight-bearing expectations during rehabilitation.

All three charts together form the complete preoperative planning and post-operative monitoring framework. For the rotation chart, see Arthrex TPLO rotation chart explained.

For the weight chart, see Arthrex TPLO weight chart explained.

Why correct plate size matters

Mechanical adequacy: the plate must be strong enough to withstand the bending forces applied across the osteotomy during recovery typically equivalent to body weight or more during brief dynamic loading events (jumping down from a bed despite restrictions). An undersized plate risks fatigue fracture if the osteotomy takes longer to heal than expected.

Biological fit: the plate must lie flush against the bone surface. A plate that sits proud causes soft tissue irritation and can lead to the implant-associated pain and lameness that eventually requires plate removal.

Screw purchase quality: screws that are too short for the bone depth, or too long and penetrating the far cortex inappropriately, compromise fixation quality. Plate size selection is linked to the specific screw lengths that are compatible with each plate variant.

Frequently asked questions

Can the surgeon change the plate size during surgery?

Yes. If the preoperatively planned plate size does not fit correctly once the osteotomy is made and the bone is positioned, the surgeon may open a different plate size.

This is why surgical teams keep a range of plate sizes available in the sterile field or immediately accessible.

The plate is a single-use sterile item it cannot be resterilized if opened and unused.

Are Arthrex and Synthes plates interchangeable?

No. Each manufacturer's plates require that manufacturer's specific screws, instruments, and jigs.

Using Synthes screws in an Arthrex plate (or vice versa) risks stripped screw heads, incorrect screw purchase geometry, and compromised fixation. The systems are entirely separate.

How does the surgeon know which plate to order before surgery?

The surgeon measures the tibial width and records body weight at the preoperative planning appointment.

Based on these measurements and the manufacturer's size chart, a specific plate and screw set is ordered or identified from the implant inventory before surgery.

Is a larger plate always better for a big dog?

Not necessarily.

The plate must fit the tibial anatomy. A plate longer than the available cortical surface overhangs the bone, creating soft tissue irritation and stress concentration at the plate ends.

The goal is the smallest plate that provides adequate mechanical fixation for the dog's body weight and expected activity level.

What happens if the wrong plate size is used?

An undersized plate risks fatigue fracture under repetitive loading. An oversized plate may not conform to the bone surface, reducing screw fixation quality and potentially causing soft tissue irritation.

Plate failure or malposition requiring revision is a recognized complication of poor implant selection.

Resources

• Arthrex Vet Systems. TPLO Locking Plate System. arthrexvetsystems.com
• Arthrex Vet Systems. 4.5 mm TPLO Plates and Screws. arthrexvetsystems.com
• PMC. Influence of Fixation Systems on Complications After TPLO in Dogs Greater Than 45 kg. ncbi.nlm.nih.gov
• VCA Animal Hospitals. Tibial Plateau Leveling Osteotomy (TPLO) in Dogs. vcahospitals.com

TPLO (tibial plateau leveling osteotomy) is the most widely performed surgery for cranial cruciate ligament (CCL) rupture in dogs.

It is the procedure most commonly recommended by board-certified veterinary surgeons for medium and large dogs, and it has the most extensive published evidence base of any CCL repair technique.

Understanding what TPLO is, why it works, and what recovery involves helps owners make informed decisions and prepare for the process.

Quick answer: TPLO (tibial plateau leveling osteotomy) corrects CCL rupture by changing tibial plateau geometry to eliminate the shear force making the CCL unnecessary. A curved cut is made through the tibia, rotated to 5 degrees, and secured with a locking plate while the bone heals. Success rate is 90 to 95%.

Key takeaways

• TPLO stands for tibial plateau leveling osteotomy: it levels the tibial plateau through a bone cut to stabilize the stifle without relying on the damaged CCL
• TPLO corrects CCL rupture by eliminating the shear force the CCL resists: it changes the tibial plateau geometry so the joint is stable without a CCL
• The procedure achieves a post-operative tibial plateau angle of approximately 5 degrees: VCA confirms the tibial plateau is rotated until appropriately level (ideally 5 degrees), eliminating cranial tibial thrust
• TPLO has a 90 to 95% success rate: RCVS confirms 90 to 95% of dogs regain complete or near-complete function; 93% of owners report satisfaction at 12 months
• Recovery requires 8 to 12 weeks of activity restriction for bone healing; progressive return to full activity follows; muscle recovery takes up to 6 months
• TPLO is the most commonly recommended procedure for CCL rupture by ACVS surgeons in dogs over approximately 15 to 20 kg

The CCL and why it ruptures

The cranial cruciate ligament (CCL) is the equivalent of the human ACL in dogs.

It connects the femur (thigh bone) to the tibia (shin bone) inside the stifle (knee) joint and serves three primary functions:

• Preventing the tibia from sliding forward relative to the femur during weight bearing
• Limiting internal rotation of the tibia
• Preventing hyperextension of the stifle

Unlike most human ACL tears (which are acute traumatic events), CCL rupture in dogs is typically degenerative. The fibers weaken progressively over months to years before the ligament fails completely.

By the time complete rupture occurs, most of the fibers have already been compromised.

This is why the contralateral (opposite) CCL is also at risk -- the same degenerative process typically affects both stifles.

When the CCL ruptures, the tibial plateau's natural slope creates an unconstrained cranial shear force during weight bearing.

The femur slides down the tibial plateau, the tibia shifts forward, and the dog is in pain and unable to use the leg normally.

CCL rupture is one of the most common orthopedic injuries in dogs. High-risk breeds include Labrador Retrievers, Rottweilers, Staffordshire Terriers, Mastiffs, Newfoundlands, and German Shepherds.

Neutered dogs have a higher risk than intact dogs of the same breed.

How TPLO works: the biomechanical principle

The normal canine tibial plateau slopes downward from front to back at approximately 23 to 29 degrees (the tibial plateau angle, or TPA).

When the dog bears weight, this slope creates a cranial shear force -- the tibia tries to slide forward relative to the femur. In a normal stifle, the CCL resists this force.

When the CCL is absent, the force is unopposed and the joint is unstable.

TPLO does not attempt to restore the CCL. Instead, it eliminates the shear force entirely.

By rotating the tibial plateau to approximately 5 degrees, the joint surface becomes level enough that the patellar tendon -- rather than the CCL -- provides the stabilizing force during weight bearing.

The joint is mechanically stable without any ligament. The need for the CCL is eliminated by changing the geometry of the tibial plateau.

Dispomed confirms: TPLO addresses CCL rupture by altering the biomechanics of the stifle. The tibial plateau normally slopes downward; TPLO creates a flat or level plateau, decreasing sliding motion at this joint.

The TPLO procedure: step by step

Pre-operative planning

Before surgery, the dog is sedated and lateral stifle radiographs are taken.

The surgeon measures the TPA from these images and calculates the amount of rotation required to achieve the target post-operative TPA of approximately 5 degrees.

The surgeon also selects the appropriate saw blade radius and implant size based on these measurements and the dog's body weight.

Anesthesia and preparation

The dog is placed under general anesthesia. The surgical site is clipped and prepared with antiseptic solution. IV antibiotics (typically cefazolin) are given before the incision.

Joint inspection and meniscal assessment

The surgeon makes an incision over the medial aspect of the proximal tibia and performs a small arthrotomy (opening into the joint) to inspect the menisci.

Damaged meniscal tissue is removed at this stage.

Chewy confirms: during surgery, the joint is examined and the surgeon might remove damaged tissue before proceeding with the osteotomy.

The osteotomy

Using a specialized oscillating saw blade, the surgeon makes a curved (arcuate) cut through the proximal tibia at the level of the tibial plateau.

The radius of this cut is determined by the pre-operative planning.

Rotation

The cut bone segment (containing the tibial plateau) is rotated backward (caudally) by the calculated amount to achieve the target TPA.

VCA Animal Hospitals confirms: the top section of the tibia is rotated backward until deemed appropriately level -- typically 2 to 14 degrees, with 5 degrees as the ideal angle.

Plate fixation

A TPLO plate (a contoured locking plate) is secured to the tibia across the osteotomy using locking screws. The plate holds the rotated tibial plateau in position while the bone heals.

Closure

The joint capsule, fascia, subcutaneous tissue, and skin are closed in layers. The incision is bandaged.

Success rate and outcomes

RCVS Canine Cruciate Registry confirms: TPLO has a 90 to 95% success rate, with 90 to 95% of dogs regaining complete or near-complete function; 93% of owners reporting satisfaction at 12 months.

A 2013 study found that TPLO patients achieved 93% restoration of limb function at 1 year.

TPLO produces better long-term outcomes than lateral suture stabilization in most studies of large dogs, and similar long-term outcomes to TTA in comparable patient populations.

RCVS confirms: all dogs with CCL rupture are expected to develop at least some osteoarthritis, but this is reduced or delayed in dogs that have had surgical stabilization.

Recovery overview

• Weeks 0 to 2: crate rest, 5-minute bathroom leash walks only, e-collar on at all times
• Weeks 2 to 6: graduated leash walk increase, passive range-of-motion exercises
• Week 6: radiographic assessment of bone healing; activity increase if healing is progressing
• Weeks 8 to 12: final radiographic confirmation of bone healing; activity restrictions lifted if healing is confirmed
• Months 3 to 6: progressive return to full activity; muscle recovery continues

For the full recovery guide, see what to expect after TPLO surgery in dogs. For the surgery comparisons, see TPLO vs CBLO vs TTA: a guide to cruciate surgery options.

For preparation, see preparing for your dog's TPLO surgery. For the signs that TPLO may be needed, see 13 signs your dog may need TPLO surgery.

Frequently asked questions

Is TPLO the only surgery for CCL rupture in dogs?

No. The main alternatives are lateral suture stabilization (extracapsular repair), TTA (tibial tuberosity advancement), and CBLO (CORA-based leveling osteotomy). Lateral suture achieves good outcomes in dogs under approximately 35 pounds.

TTA produces similar long-term outcomes to TPLO in appropriately selected dogs. CBLO is used mainly for immature dogs and revision surgery cases.

Can a dog live without surgery for CCL rupture?

Small dogs (under 10 to 15 kg) sometimes stabilize adequately with conservative management (strict rest, weight management, joint support).

For most dogs over 15 kg, conservative management does not restore normal joint stability and the dog remains in pain with progressive arthritis.

Surgery is strongly recommended for most medium and large dogs.

How long does TPLO surgery take?

The procedure typically takes 1.5 to 2 hours. Bilateral simultaneous TPLO takes 3 to 4 hours.

Does the TPLO plate stay in permanently?

Yes, in most cases. The plate is not routinely removed after the osteotomy heals. It is removed if it causes complications (infection, implant irritation, failure).

What is the cost of TPLO surgery?

TPLO typically costs $3,500 to $6,000 per stifle depending on the facility, surgeon, geographic location, and the dog's size.

This typically includes the surgical procedure, anesthesia, hospitalization, implants, and the immediate post-operative period.

Resources

• RCVS Canine Cruciate Registry. Tibial Plateau Levelling Osteotomy (TPLO). rcvsknowledge.org
• VCA Animal Hospitals. TPLO. vcahospitals.com
• Dispomed. TPLO Surgery in Dogs: Success Rates and Alternatives. dispomed.com
• ACVS. Cranial Cruciate Ligament Disease. acvs.org

Bruising after TPLO surgery in dogs is a common concern for many pet owners. TPLO, or Tibial Plateau Leveling Osteotomy, is a surgical procedure to stabilize a dog's knee after a cruciate ligament injury. After surgery, owners often notice bruising around the incision site or leg, which can be alarming.

This article explains why bruising happens after TPLO surgery, how to care for your dog during recovery, and when to contact your veterinarian. Understanding bruising helps you support your dog's healing process effectively.

Why Does Bruising Occur After TPLO Surgery in Dogs?

Bruising happens when blood vessels under the skin break and leak blood into surrounding tissues. After TPLO surgery, bruising is usually due to the trauma of surgery and tissue manipulation. The surgical area may show discoloration as part of normal healing.

It is important to recognize that some bruising is expected, but excessive or worsening bruising may indicate complications. Knowing the causes helps you monitor your dog’s recovery closely.

• Surgical trauma: The cutting and repositioning of bone and soft tissue during TPLO can cause small blood vessels to rupture, leading to bruising around the surgical site.
• Inflammation response: The body’s natural healing process causes inflammation, which can increase blood flow and cause visible bruising and swelling near the incision.
• Blood thinning medications: If your dog is on medications like aspirin or NSAIDs, these can increase bruising risk by affecting clotting mechanisms.
• Movement after surgery: Excessive activity or pressure on the leg soon after surgery can worsen bruising by disrupting healing tissues and blood vessels.

Understanding these causes helps you differentiate normal bruising from signs of complications that need veterinary attention.

What Does Normal Bruising Look Like After TPLO Surgery?

Normal bruising after TPLO surgery usually appears as a purple, blue, or reddish discoloration around the incision or leg. It often develops within 24 to 48 hours post-surgery and gradually fades over 1 to 2 weeks.

Knowing the typical appearance and timeline of bruising helps you track your dog’s healing and identify abnormal changes early.

• Color changes: Bruises typically start dark purple or blue, then change to green, yellow, and finally fade as healing progresses over days to weeks.
• Size and spread: Normal bruising is usually localized near the incision and does not spread extensively to other parts of the leg or body.
• Swelling presence: Mild swelling often accompanies bruising but should not cause severe discomfort or limb deformity.
• Pain level: Some tenderness is expected, but your dog should not show signs of severe pain or limping beyond normal post-surgical recovery.

Monitoring these signs helps ensure bruising is part of normal healing and not a sign of infection or bleeding complications.

How Should You Care for Bruising After TPLO Surgery?

Proper care reduces bruising severity and supports healing after TPLO surgery. Following your veterinarian’s instructions and providing gentle care helps your dog recover comfortably and safely.

Simple steps at home can minimize bruising and swelling while preventing complications.

• Rest and restricted activity: Limit your dog’s movement to prevent pressure on the surgical site and avoid worsening bruising or swelling.
• Cold compress application: Applying a cold pack wrapped in cloth for 10–15 minutes several times daily during the first 48 hours can reduce swelling and bruising.
• Proper bandage care: Keep any surgical bandages clean and dry, and follow your vet’s instructions on changing or removing them to avoid irritation.
• Medication adherence: Administer all prescribed painkillers and anti-inflammatory drugs exactly as directed to control pain and reduce inflammation.

Consistent care helps your dog heal faster and reduces the risk of bruising-related complications.

When Should You Be Concerned About Bruising After TPLO Surgery?

While bruising is normal, certain signs indicate that your dog may need urgent veterinary evaluation. Recognizing these warning signs early can prevent serious complications.

If you notice any of the following, contact your veterinarian promptly for advice or examination.

• Rapidly expanding bruises: Bruising that spreads quickly or becomes very large may signal active bleeding or hematoma formation requiring medical attention.
• Excessive swelling and heat: Swelling that worsens with warmth and redness around the incision could indicate infection or inflammation needing treatment.
• Severe pain or lameness: If your dog shows intense pain, refuses to bear weight, or has a limp worsening over time, this may suggest complications.
• Discharge or foul odor: Any pus, bleeding, or bad smell from the surgical site is a sign of infection and requires immediate veterinary care.

Early detection of problems helps ensure timely treatment and better recovery outcomes.

Can Bruising Affect Your Dog’s Recovery After TPLO Surgery?

Bruising itself usually does not affect the overall success of TPLO surgery if it is mild and managed properly. However, severe bruising or related complications can delay healing and cause discomfort.

Understanding the impact of bruising helps you provide better care and communicate effectively with your veterinarian during recovery.

• Minor bruising benefits: Mild bruising is a normal sign of healing and usually resolves without affecting joint stability or function.
• Severe bruising risks: Large bruises or hematomas can increase pain, limit mobility, and sometimes require drainage or additional treatment.
• Infection risk: Bruised tissue is more vulnerable to infection, so keeping the area clean and monitoring closely is essential.
• Physical therapy considerations: Bruising may limit early physical therapy, so adjusting rehabilitation plans based on your dog’s condition is important.

Working closely with your vet ensures bruising does not interfere with your dog’s full recovery and return to normal activity.

How Can You Prevent Bruising After TPLO Surgery in Dogs?

While some bruising is unavoidable due to surgery, certain steps can reduce its severity and support smooth healing. Prevention focuses on careful handling and following veterinary guidance.

Taking precautions before and after surgery helps protect your dog’s tissues and blood vessels from excessive damage.

• Pre-surgery health check: Ensuring your dog is healthy and not on blood-thinning medications before surgery reduces bruising risk.
• Gentle post-op handling: Avoid rough play, jumping, or excessive pressure on the leg during recovery to prevent new bruises.
• Follow medication instructions: Use prescribed drugs properly and avoid over-the-counter medications without vet approval to prevent clotting issues.
• Regular veterinary follow-up: Attend all scheduled check-ups so your vet can monitor healing and address bruising or other concerns early.

Prevention and careful management promote a safer, faster recovery with minimal bruising complications.

Conclusion

Bruising after TPLO surgery in dogs is a common and usually normal part of the healing process. It results from surgical trauma and inflammation, appearing as discoloration near the incision site. Mild bruising typically resolves within two weeks without affecting recovery.

Proper care, including rest, cold compresses, and medication adherence, helps reduce bruising and supports healing. However, owners should watch for signs of excessive bruising, swelling, pain, or infection and contact their veterinarian promptly if these occur. Understanding bruising after TPLO surgery allows you to care for your dog confidently and ensure a smooth recovery.

FAQs

Is bruising after TPLO surgery normal for all dogs?

Yes, mild bruising is common after TPLO surgery due to tissue trauma and inflammation. However, the amount varies by individual and surgical factors.

How long does bruising last after TPLO surgery?

Bruising usually appears within 1–2 days after surgery and fades over 1 to 2 weeks as the tissues heal naturally.

Can I use cold packs on my dog’s bruising after surgery?

Yes, applying cold compresses wrapped in cloth for 10–15 minutes several times daily during the first 48 hours helps reduce swelling and bruising.

When should I call the vet about bruising after TPLO?

Contact your vet if bruising spreads rapidly, swelling worsens, pain is severe, or if there is discharge or foul odor from the incision.

Does bruising affect my dog’s ability to walk after TPLO surgery?

Mild bruising usually does not affect walking, but severe bruising or pain may cause limping and require veterinary evaluation.

When dogs suffer from cranial cruciate ligament (CCL) rupture, surgical options like CORA-Based Leveling Osteotomy (CBLO) and Tibial Plateau Leveling Osteotomy (TPLO) are common. Choosing the right surgery can be confusing for pet owners. This article explains the differences between CBLO and TPLO clearly.

Both surgeries aim to stabilize the knee and reduce pain, but they use different techniques. Understanding these can help you decide the best treatment for your dog. You will learn how each surgery works, their benefits, risks, and recovery expectations.

What is CORA-Based Leveling Osteotomy (CBLO)?

CBLO is a newer surgical method designed to correct the knee joint angle by cutting and rotating the tibia bone. It uses the Center of Rotation of Angulation (CORA) to plan the correction precisely. This technique aims to restore normal joint mechanics and reduce arthritis progression.

The surgery involves measuring the tibial plateau angle and calculating the exact bone cut needed. This precision helps improve joint stability and function after surgery.

• Precise correction planning: CBLO uses detailed imaging to calculate the exact bone cut angle, improving surgical accuracy and joint alignment.
• Restores joint mechanics: By correcting the tibial angle precisely, CBLO helps the knee function more naturally, reducing abnormal stresses.
• Reduces arthritis risk: Better joint alignment may slow arthritis development compared to other techniques.
• Suitable for various dogs: CBLO can be adapted for different breeds and sizes, making it versatile for many patients.

CBLO is gaining popularity because it focuses on restoring the knee’s natural biomechanics. This can lead to better long-term outcomes for dogs with CCL injuries.

What is Tibial Plateau Leveling Osteotomy (TPLO)?

TPLO is a well-established surgery that changes the slope of the tibial plateau to stabilize the knee without relying on ligament repair. It involves cutting the tibia and rotating the bone to a flatter angle. This reduces the forward thrust that causes instability in CCL injuries.

TPLO has been used for decades and is considered a gold standard for many surgeons treating CCL rupture. It is effective in restoring function and reducing pain.

• Changes tibial slope: TPLO flattens the tibial plateau angle to prevent the femur from sliding forward during movement.
• Improves joint stability: By altering bone geometry, TPLO stabilizes the knee without needing ligament reconstruction.
• Proven track record: TPLO has decades of clinical use with good success rates in many dog breeds.
• Requires specialized equipment: The surgery needs specific saws and plates designed for the procedure.

TPLO remains a trusted option for many veterinarians due to its consistent results and ability to restore mobility in affected dogs.

How do CBLO and TPLO differ in surgical technique?

Both CBLO and TPLO involve cutting and rotating the tibia, but their planning and goals differ. CBLO uses the CORA method for precise angle correction, while TPLO focuses on leveling the tibial plateau to a standard angle.

These differences affect how the bone is cut, rotated, and fixed with plates and screws during surgery.

• Planning approach: CBLO uses CORA calculations for individualized correction; TPLO uses a fixed target angle for leveling.
• Bone cut shape: CBLO often uses an angled cut based on CORA; TPLO uses a curved cut around the tibial plateau.
• Rotation amount: CBLO rotation varies by dog’s anatomy; TPLO rotation aims for a 5-degree tibial plateau slope.
• Implant fixation: Both use plates and screws, but implant design may differ based on osteotomy shape.

Understanding these technical differences helps surgeons choose the best method for each patient’s anatomy and needs.

What are the benefits of CBLO compared to TPLO?

CBLO offers several advantages due to its precise correction method. It aims to restore normal joint mechanics more closely than TPLO, which may improve long-term joint health.

These benefits can influence recovery speed, pain levels, and arthritis progression after surgery.

• Individualized correction: CBLO tailors the bone cut to each dog’s unique anatomy, potentially improving joint function.
• Potentially less arthritis: Better joint alignment may reduce abnormal wear and slow arthritis development.
• Preserves bone stock: CBLO may remove less bone compared to TPLO, preserving more natural structure.
• Improved biomechanics: Restoring the natural joint angle can lead to better limb use and comfort.

While CBLO is newer, early studies suggest it may offer improved outcomes for some dogs compared to TPLO.

What are the risks and complications of CBLO and TPLO?

Both surgeries carry risks common to orthopedic procedures, including infection, implant failure, and delayed healing. Some risks vary based on technique and patient factors.

Knowing these risks helps owners prepare and monitor their dogs after surgery.

• Infection risk: Both surgeries involve bone cuts and implants, which can become infected if not properly managed.
• Implant complications: Plates or screws may loosen or break, requiring revision surgery in some cases.
• Delayed bone healing: Healing time can vary, and some dogs may experience slower recovery.
• Postoperative pain: Both procedures cause pain that needs management with medication and care.

Choosing a skilled surgeon and following postoperative instructions reduce these risks significantly.

How do recovery and rehabilitation compare between CBLO and TPLO?

Recovery after CBLO and TPLO involves rest, controlled activity, and physical therapy. Both surgeries require careful management to ensure proper bone healing and joint function.

Rehabilitation protocols may differ slightly based on the surgery type and surgeon preference.

• Initial rest period: Both require strict rest for 6 to 8 weeks to allow bone healing without stress.
• Physical therapy: Controlled exercises help regain strength and range of motion gradually.
• Pain management: Medications and cold therapy reduce pain and swelling during recovery.
• Long-term outcome: Most dogs regain good limb function within 3 to 6 months post-surgery.

Following the veterinarian’s rehabilitation plan is crucial for a successful recovery regardless of the surgery chosen.

Which dogs are best suited for CBLO or TPLO?

Dog size, breed, age, and anatomy influence which surgery is most appropriate. Both CBLO and TPLO can treat CCL rupture effectively but may be better suited to different patients.

Veterinarians evaluate each dog’s knee anatomy and lifestyle before recommending surgery.

• Large breeds: TPLO has a long history of success in large and active breeds like Labradors and German Shepherds.
• Variable anatomy: CBLO’s precise correction suits dogs with unusual tibial angles or complex deformities.
• Older dogs: Both surgeries can be performed safely, but recovery may be slower in senior dogs.
• Activity level: Active dogs may benefit from the biomechanical advantages of CBLO or TPLO depending on anatomy.

Discussing your dog’s specific case with a veterinary surgeon helps determine the best surgical option.

Conclusion

Choosing between CORA-Based Leveling Osteotomy and TPLO depends on your dog’s anatomy, breed, and lifestyle. Both surgeries aim to stabilize the knee and reduce pain from cruciate ligament rupture.

CBLO offers precise correction tailored to the dog’s unique bone structure, potentially improving joint mechanics and reducing arthritis risk. TPLO is a proven, reliable surgery with decades of success in many breeds. Consulting your veterinarian will help you decide the best option for your dog’s health and recovery.

FAQs

What is the main difference between CBLO and TPLO?

CBLO uses precise angle correction based on the CORA method, while TPLO levels the tibial plateau to a fixed angle to stabilize the knee.

Is one surgery better for small dogs?

Both surgeries can be used in small dogs, but CBLO’s individualized correction may be more suitable for unusual bone shapes.

How long does recovery take after these surgeries?

Recovery typically takes 3 to 6 months, with strict rest and physical therapy essential for proper healing.

Are there risks of arthritis after CBLO or TPLO?

Both surgeries reduce arthritis risk by stabilizing the knee, but CBLO may better preserve joint mechanics, potentially slowing arthritis progression.

Can dogs return to normal activity after surgery?

Most dogs regain good limb function and return to normal activity levels with proper rehabilitation after either CBLO or TPLO.

TPLO produces predominantly positive long-term effects in most dogs, but it also produces a predictable set of changes that owners should understand and manage proactively.

Most of these effects are manageable with appropriate care. Knowing what to expect prevents owners from being surprised by normal post-TPLO findings and helps them recognize when a change requires veterinary attention.

Quick answer: The 13 key long-term effects of TPLO surgery: improved joint stability, progressive osteoarthritis, muscle atrophy, morning stiffness, cold weather sensitivity, scar tissue formation, patellar tendon thickening, permanent implant in situ, contralateral CCL rupture risk, late implant complications, behavioral changes from chronic pain, weight management challenges, and long-term monitoring requirements.

Key takeaways

• Improved joint stability is the intended and most common long-term effect: for 90 to 95% of dogs, TPLO eliminates CCL-related instability and restores near-normal function
• Progressive osteoarthritis develops in all CCL-affected stifles regardless of surgical technique: TPLO slows OA progression but does not stop it; long-term OA management is a universal requirement
• Muscle atrophy is common in the operated leg throughout recovery; the thigh may remain visibly smaller than the contralateral side for months if rehabilitation is inadequate
• Contralateral CCL rupture risk is high: SustainableVet.org confirms up to a 50% chance of tearing the opposite CCL within a few years; the same degenerative process affects both stifles
• The TPLO plate and screws are permanent in the vast majority of cases: removal is only performed when complications arise; routine plate removal is not standard practice
• Weight management is the most impactful long-term owner-controlled variable: excess weight accelerates OA progression; maintaining ideal body condition is the primary long-term prevention strategy

The 13 long-term effects

1. Improved joint stability and mobility

The primary intended effect. The osteotomy and plate fixation permanently change the tibial plateau geometry, eliminating the cranial tibial thrust that caused instability.

For 90 to 95% of dogs, this produces lasting functional improvement: return to normal gait, ability to run and play, and freedom from the pain of unstable joint loading.

SustainableVet.org confirms: over 90% of dogs regain full limb function within a year; with proper care, many dogs remain active for 8 to 10 years after surgery.

2. Progressive osteoarthritis

The most universal long-term challenge. CCL disease initiates an arthritis process in the stifle that continues regardless of surgical outcome.

TPLO reduces the rate of progression and the severity of clinical signs compared to other treatment options, but OA continues.

Clinical signs of progressing OA emerge gradually over months and years: stiffness after rest, reluctance to run, difficulty climbing, and behavioral changes associated with chronic low-grade pain.

Management: weight management, omega-3 fatty acids, glucosamine and chondroitin, NSAIDs for flares, hydrotherapy, physiotherapy.

3. Muscle atrophy and asymmetry

The operated leg loses muscle mass rapidly during the restriction period and slowly rebuilds during rehabilitation. Full recovery of muscle symmetry takes 4 to 6 months in most dogs.

In some dogs -- particularly those with inadequate rehabilitation or ongoing joint pain -- visible thigh circumference asymmetry persists long-term.

Vetplayas confirms: due to reduced use during recovery and altered movement patterns post-surgery, muscles around the operated leg may weaken and shrink.

4. Morning stiffness

Morning stiffness -- the dog rises from sleep stiffly and walks awkwardly for the first few minutes before loosening up -- is one of the most common long-term effects of post-TPLO OA.

It typically develops months to years after surgery and gradually worsens as the dog ages.

This stiffness should not be confused with acute lameness. It consistently improves within 5 to 10 minutes of movement.

If it does not improve, or if the dog refuses to bear weight on waking, contact your vet.

5. Cold weather sensitivity

Dogs with OA in the operated stifle commonly show increased stiffness and lameness during cold weather or when barometric pressure changes.

This reflects the sensitivity of arthritic joints to temperature and pressure changes -- the same phenomenon seen in human arthritis.

Management: NSAIDs or joint supplements maintained year-round; warming the dog's sleeping area; a brief gentle walk before expecting full function in cold conditions.

6. Scar tissue formation

The surgical dissection and bone healing produce scar tissue in and around the stifle. This fibrous tissue generally has a beneficial stabilizing effect, contributing to long-term joint stability.

In some dogs, however, periarticular fibrosis restricts range of motion and causes stiffness that persists long after bone healing is complete.

Regular low-impact exercise and physiotherapy help maintain range of motion and prevent excessive fibrous tissue restriction.

7. Patellar tendon thickening

Fibrous thickening of the patellar tendon is a recognized long-term change after TPLO. It is typically subclinical -- detected on palpation at follow-up examinations but not producing clinical lameness.

In a small number of dogs, it contributes to reduced range of motion.

8. Permanent implant in situ

The TPLO plate and screws are designed to remain in place for life. In the vast majority of dogs, the implant is never removed and causes no long-term problems.

SustainableVet.org confirms: these implants are meant to stay in place permanently. In rare cases, some dogs may develop infections around the implant or experience loosening of the hardware over time.

The plate is palpable under the skin on the medial tibial surface. This is normal and not a complication.

9. Contralateral CCL rupture

The degenerative process that caused one CCL to rupture typically affects both stifles.

SustainableVet.org confirms dogs have up to a 50% chance of tearing the CCL in the opposite knee within a few years.

RCVS confirms approximately 50% of dogs develop CCL disease in the other hind limb.

This is not a complication of TPLO -- it is the natural history of bilateral CCL disease.

Monitoring the contralateral stifle for early signs of instability, effusion, or lameness is appropriate in all TPLO dogs.

10. Late implant-associated complications

Implant-related complications -- loosening, late infection from hematogenous seeding, or implant irritation -- can occur years after the original surgery. These are uncommon but recognized long-term effects.

Signs: new lameness focused at the plate site, warmth or swelling over the plate, a new draining tract in previously healed skin. Any of these warrants prompt veterinary assessment.

11. Behavioral changes

Chronic joint pain from progressive OA, late meniscal injury, or implant irritation can produce subtle behavioral changes: reduced engagement in play, reluctance to walk, increased irritability, or reduced stair use.

These changes are often attributed to aging but may reflect treatable pain.

Annual or semi-annual pain assessments, including use of validated canine pain scales (Canine Brief Pain Inventory, Helsinki Chronic Pain Index), help detect behavioral pain signs before they become severe.

12. Weight management challenges

Activity restriction during recovery predisposes many dogs to weight gain. Excess weight gained during the 8 to 12 week restriction period is then carried on the healing joint for the following months.

Long-term obesity accelerates OA progression and is the most modifiable risk factor for long-term joint health.

Medcovet confirms: because activity is restricted, veterinary teams may recommend reducing food intake by about 30% during recovery to prevent weight gain and extra strain on the knee joint.

13. Long-term monitoring and supplement requirements

TPLO dogs benefit from long-term monitoring (every 6 to 12 months after full recovery) to assess:

• Arthritis progression radiographically and clinically
• Body condition score and weight
• Contralateral stifle stability
• Implant integrity (radiographs every 1 to 2 years in some protocols)

Joint supplements (omega-3 fatty acids at anti-inflammatory doses; glucosamine and chondroitin) and ongoing weight management are the primary preventive interventions for the long-term joint changes that TPLO does not prevent.

For the long-term outcomes guide, see long-term outcomes of TPLO surgery. For arthritis management, see arthritis after TPLO surgery in dogs.

For the signs that require attention, see signs of TPLO failure in dogs. For the failure rate overview, see TPLO failure rate in dogs.

Frequently asked questions

Will my dog develop arthritis even if the TPLO was successful?

Yes. All CCL-affected stifles develop progressive osteoarthritis regardless of surgical technique or outcome.

TPLO reduces the rate of progression and the severity of clinical signs compared to non-surgical management and lateral suture repair.

The goal of TPLO is not to prevent OA but to minimize it while restoring function.

How long will the TPLO plate last?

The plate is designed to be permanent. Published long-term follow-up data at 6.8 years shows 90.4% of dogs with good to excellent results -- with the plate in place.

Plate complications requiring removal occur in 3.5 to 7.5% of cases.

My dog had TPLO 2 years ago and is now limping. Is this related to the surgery?

Possibly. Two-year post-TPLO lameness most commonly results from progressive OA, late meniscal tear, late implant-associated infection (hematogenous seeding), or contralateral CCL disease.

A veterinary examination and radiographs of both stifles will identify the cause and guide treatment.

Does the opposite leg always need TPLO as well?

Not necessarily and not always at the same time. RCVS confirms approximately 50% of dogs develop CCL disease in the opposite hind limb.

When and whether the second stifle requires surgery depends on whether the second CCL has ruptured or become significantly unstable. Annual monitoring of the contralateral stifle is appropriate.

Can TPLO dogs still live active lives long-term?

Yes. Most do. SustainableVet.org confirms that with proper care, many dogs remain active for 8 to 10 years after surgery.

The keys are weight management, regular low-impact exercise, joint supplements, and addressing pain or complications promptly.

Resources

• SustainableVet. 13 Long-Term Effects of TPLO Surgery on Dogs. sustainablevet.org
• RCVS Canine Cruciate Registry. Tibial Plateau Levelling Osteotomy. rcvsknowledge.org
• TPLO Info. TPLO Literature and Studies. tploinfo.com
• SustainableVet. Long-Term Outcomes of TPLO Surgery. sustainablevet.org