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TPLO, CBLO, and TTA: A Guide to Cruciate Surgery Options

TPLO, CBLO, and TTA: A Guide to Cruciate Surgery Options

Best Practices

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Compare TPLO, TTA, and CBLO surgeries for dog cruciate ligament injuries. Learn differences, costs, recovery, and best option for your dog

By 

Sustainable Vet Group

Updated on

August 13, 2026

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This article is for informational purposes only and is not a substitute for professional veterinary advice. Every case is unique, so always consult your veterinarian for guidance specific to your pet.

This content is intended for veterinary professionals for educational purposes. It does not replace clinical judgment or tailored advice. Always rely on your training, expertise, and the specific context of your patients.

TPLO, CBLO, and TTA: A Guide to Cruciate Surgery Options

When a dog tears its cranial cruciate ligament (CCL), three osteotomy-based surgeries are currently in widespread use: TPLO (tibial plateau leveling osteotomy), TTA (tibial tuberosity advancement), and CBLO (CORA-based leveling osteotomy).

All three aim to change the biomechanics of the stifle to eliminate the need for the damaged CCL.

They differ in the specific bone cut, the mechanism of stabilization, the implants used, and the evidence base supporting their outcomes.

 

Quick answer: TPLO, TTA, and CBLO all stabilize the stifle by changing tibial geometry. TPLO has the most evidence, is the ACVS gold standard for large dogs, and achieves 93% limb function at 1 year. TTA produces similar long-term outcomes. CBLO is used mainly for immature dogs and revision surgery.

 

Key takeaways

  • TPLO is the most evidence-supported procedure: a 2013 study confirmed 93% limb function restoration at 1 year; it is the ACVS-preferred procedure for most large, active dogs
  • TTA produces similar long-term outcomes to TPLO: a PMC systematic review of 72 studies found both are successful; TTA may have slightly faster early recovery
  • CBLO is a newer TPLO variant: the osteotomy is made at the CORA rather than proximally; fewer long-term studies exist; mainly used for immature dogs and revision cases
  • All three require 8 to 12 weeks of activity restriction: post-operative management is essentially identical; radiographic healing confirmation before activity return is required for all
  • TPLO has a lower SSI rate than TTA per the PMC systematic review; this is clinically meaningful given TPLO's already-elevated SSI risk vs other orthopedic procedures
  • The choice between TPLO and TTA is often surgeon preference and facility capability: no clear clinical superiority exists for appropriately selected patients; CBLO is less universally available

How each surgery works

TPLO: tibial plateau leveling osteotomy

TPLO makes a curved osteotomy through the proximal tibia and rotates the tibial plateau segment to approximately 5 degrees.

This rotation eliminates the cranial shear force that drives tibial thrust when the CCL is absent. A plate and locking screws hold the rotated segment while the osteotomy heals.

The result: the stifle is mechanically stable during weight bearing regardless of CCL integrity, because the geometry of the tibial plateau no longer creates the shear force that was causing instability.

TTA: tibial tuberosity advancement

TTA moves the tibial tuberosity (the bony prominence at the front of the tibia where the patellar tendon attaches) forward, changing the angle between the patellar tendon and the tibial plateau.

When this angle reaches approximately 90 degrees, the patellar tendon acts as an active stabilizer of the stifle during weight bearing, neutralizing the cranial shear force.

TTA uses a cage (typically titanium or porous polyethylene) to maintain the advanced position of the tuberosity during healing.

B Braun Vet Care confirms: TTA was quicker with a smaller incision; patients weight bore faster with fewer direct post-operative complications. However, longer-term studies show similar outcomes for each procedure.

CBLO: CORA-based leveling osteotomy

CBLO is a variant of the leveling osteotomy concept.

TPLO makes its circular cut proximally near the tibial plateau. CBLO makes its osteotomy at the CORA (center of rotation of angulation), which is lower on the bone.

The goal is to correct the tibial deformity at the site where it actually originates geometrically, which may produce a more anatomically accurate correction in some dogs.

Southern Animal Health confirms: CBLO benefits appear limited to immature dogs or revision surgery where cuts have already been made higher on the bone.

Outcome comparison

TPLO outcomes

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

A randomized blinded clinical trial comparing lateral fabellar suture stabilization with TPLO in 80 dogs confirmed TPLO produced higher peak vertical force and higher owner satisfaction at 1 year.

TPLO has the most extensive published evidence base of any cruciate repair technique in dogs.

Vetamac confirms: a 2013 study found TPLO patients averaged 93% limb function return at 1 year, and a higher percentage achieved full return compared to TTA.

TTA outcomes

The PMC systematic review of 72 studies (PMC9748159) found both TPLO and TTA are successful management options, with no lameness at long-term evaluation for most patients.

It also found TTA showed better OA scores up to 6 months postoperatively, while TPLO had lower SSI rates.

B Braun Vet Care confirms: many longer-term studies show similar outcomes for TPLO and TTA; one study suggests TPLO had a marginally better outcome than MMP.

Southern Animal Health confirms: a study of long-term results 3 years after surgery clearly shows that TTA and MMP candidates show more arthritis and more discomfort than dogs repaired with TPLO.

CBLO outcomes

CBLO has fewer published long-term studies than TPLO or TTA. Early results are promising.

The SustainableVet.org CBLO article confirms that CBLO produces good outcomes and is particularly used for dogs with steep tibial slopes or early arthritis.

Longer-term comparative data against TPLO in equivalent patient populations remains limited.

Patient selection

When TPLO is the preferred choice

  • Dogs over 35 to 40 pounds (medium to large breeds)
  • Young, athletic, or working dogs of any size
  • Dogs with steep tibial plateau angles (TPA above 25 to 30 degrees)
  • Cases where maximum long-term joint stability and arthritis control are priorities

When TTA may be considered

  • Dogs with low to moderate TPA (the mechanical advantage of TTA is greatest when the existing TPA is near 90 degrees)
  • Cases where a shorter surgical time is beneficial (older dogs with anesthetic risk)
  • Some surgeons prefer TTA for dogs with high-velocity tibial thrust where TTA's mechanism may provide faster active stabilization

When CBLO may be considered

  • Skeletally immature dogs where TPLO would cut across the growth plate
  • Revision cases where a proximal osteotomy has already been performed
  • Dogs with unusual tibial geometry where the CORA is positioned lower than average

SustainableVet.org confirms: CBLO is a newer, flexible option that fits many situations, especially for dogs with steep tibial slopes or early arthritis.

Recovery comparison

All three procedures require essentially the same post-operative management:

  • Strict activity restriction for 8 to 12 weeks
  • Leash walks only during the restriction period
  • Radiographic assessment of bone healing at 6 to 8 weeks and 12 weeks
  • Progressive return to activity after radiographic confirmation

The one consistent early difference: TTA dogs may weight bear more readily in the first 1 to 2 weeks.

B Braun Vet Care confirms: TTA patients were quick to weight bear with fewer direct post-operative complications compared to TPLO.

This early advantage does not produce meaningfully different long-term outcomes in most studies.

Cost comparison

All three osteotomy procedures are similarly priced at referral centers -- typically $3,000 to $6,000 per stifle. The specific cost depends on the facility, surgeon, dog size, and geographic region.

Cost differences between TPLO, TTA, and CBLO at the same facility are typically not substantial.

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

For lateral suture comparison, see lateral suture vs TPLO for dogs.

Frequently asked questions

Is TPLO better than TTA?

For most large, active dogs, the balance of evidence slightly favors TPLO for long-term outcomes and lower arthritis progression.

However, multiple studies show no significant difference in objective gait analysis at long-term follow-up. The choice is often surgeon experience and facility capability rather than an absolute clinical superiority.

What is CBLO and is it better than TPLO?

CBLO is a variant of the leveling osteotomy that makes its bone cut at a different anatomical location. It is not established as better than TPLO for routine adult dog CCL repair.

Its main current applications are in immature dogs and revision surgery cases where TPLO would be anatomically difficult.

Which surgery has the lowest complication rate?

TTA generally has a lower SSI rate in some studies and was associated with fewer immediate post-operative complications in others.

However, TPLO and TTA have broadly comparable overall complication profiles at experienced facilities. CBLO data is more limited.

Can my regular vet perform any of these surgeries?

TPLO and TTA require specialized training and equipment (oscillating saw, specific implants, fluoroscopy for osteotomy confirmation). Both are typically performed by board-certified surgeons or general practitioners with specific TPLO or TTA training.

CBLO is similarly specialized. None of these are routine general practice procedures.

My dog had a failed TTA. Can TPLO be done as a revision?

Yes -- TPLO can be performed as a revision after a failed TTA in appropriate cases. The surgical planning differs from primary TPLO because the proximal tibial anatomy has already been altered.

CBLO may be used in these cases for similar reasons. This is a specialist procedure requiring careful pre-operative radiographic planning.

Resources

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