Dog Patellar Surgery: What Are the Options? — Differences Between TTT and Trochleoplasty

JointQ&AMeongsiljang Veterinary Advisory Board

Surgical treatment for patellar luxation in dogs typically combines several techniques, primarily trochleoplasty and tibial tuberosity transposition (TTT). The most appropriate surgical approach depends on the grade of luxation and the extent of bone deformity.

Types of Patellar Surgery at a Glance

A veterinarian examining a puppy's patella

Patellar surgery for dogs is an orthopedic procedure that corrects the bone and surrounding tissues to stabilize a dislocated kneecap. The key point is that it’s not just one single surgery. Most procedures combine trochleoplasty with tibial tuberosity transposition (TTT), and often include soft tissue reconstruction as well. The specific combination of techniques depends on the grade of luxation and the extent of bone deformation, so a thorough preoperative examination is essential.

Why Are There Multiple Types of Surgery?

Patellar luxation isn’t just about the kneecap slipping out of place. According to veterinary orthopedic textbooks, it involves a complex interplay of multiple issues, including inward bowing of the thigh bone (femoral varus), underdevelopment of the trochlear groove, medial displacement of the tibial tuberosity, and altered tension in the surrounding muscles and ligaments. Because each underlying cause requires a different corrective approach, surgeons often combine various surgical techniques. Since the severity of each structural issue varies from dog to dog, there is no single "standard" surgical procedure.

Comparison of Major Patellar Surgery Types

Item	Trochleoplasty (Trochlear Groove Deepening)	Tibial Tuberosity Transposition (TTT)	Soft Tissue Reconstruction
Purpose	Deepen the groove where the patella sits	Realign the position of the tibial tubercle	Adjust joint capsule and ligament tension
Bone Cutting Involved	Yes (cartilage preserved)	Yes (tubercle relocated)	No
When Typically Needed	When the trochlear groove is shallow	When the tibial tubercle is misaligned	When the joint capsule is stretched
Performed Alone	Usually combined	Usually combined	Performed as an adjunct

In actual surgery, 2–3 techniques are often used together.

Trochleoplasty

Trochleoplasty is a surgical procedure that deepens the groove on the front of the thigh bone (femur) through which the kneecap (patella) glides. When this groove is too shallow, the kneecap can easily slip sideways. To correct this, the groove is carved out in a V-shaped wedge or rectangular pattern, and the displaced cartilage flap is preserved and repositioned to cover the defect, creating a deeper groove lined with healthy cartilage. Veterinary orthopedic textbooks describe several trochleoplasty techniques, including wedge resection (which preserves cartilage), as well as block and rectangular resections. Rather than one method being considered the "standard," the most appropriate technique is selected based on the degree of bone deformity and the condition of the trochlear groove. Regardless of the specific approach, trochleoplasty is a fundamental component commonly performed alongside most patellar surgeries.

An anatomical illustration showing the principle of pulley groove surgery

Tibial Tuberosity Transposition (TTT)

Tibial tuberosity transposition is a surgical procedure in which the prominent "tuberosity" at the upper part of the tibia (shinbone) is cut, repositioned to its correct anatomical location, and fixed in place. When the patella is displaced medially or laterally, it cannot move in a straight line; therefore, realigning this tuberosity corrects the patellar groove. Small pins or wires are used for fixation. In cases of higher-grade dislocation or significant bone deformity, this procedure is often performed in conjunction with trochleoplasty.

An illustration from veterinary surgery showing the tibial plateau leveling osteotomy procedure

Leave the Choice of Surgery to Your Veterinarian

It’s difficult for pet owners to decide in advance, “Please perform this specific surgery.” The surgical plan is determined by measuring the bone angle, the depth of the trochlear groove, and the position of the tibial tuberosity on X-rays and CT scans, so the plan may be adjusted slightly even during the procedure. The most important step is to receive a precise diagnosis from a veterinarian with extensive orthopedic experience and to get a thorough explanation of the anticipated surgical approach and potential risks.

How Does Post-Surgical Recovery Progress?

Recovery typically takes 6 to 8 weeks. - First 2 weeks: Strict rest is required, with only brief bathroom breaks allowed. - Weeks 3–4: Begin gentle movement, focusing on short walks indoors. - Weeks 5–8: Gradually increase walk duration as directed by your veterinarian. - After 8 weeks: Adjust activity levels based on follow-up X-rays. Avoid slippery floors, stairs, and jumping throughout the entire recovery period. Incorporating rehabilitation exercises can help support muscle recovery.

A puppy recovering at home after patellar surgery

Key Points to Remember for Preventing Recurrence

Even after patellar surgery, the risk of recurrence is never completely zero. According to veterinary surgical textbooks, patellar luxation can be bilateral, meaning that after one side is operated on, the other side may also develop luxation. Weight management, maintaining muscle mass, and providing a non-slip floor environment are lifelong care priorities. For small-breed dogs, excess weight can place additional stress on the joints, making regular weight monitoring essential.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

Can pulley groove plasty be performed as a standalone procedure?

This procedure can only be performed alone when the dislocation grade is low and there is minimal bone deformation. In most cases, it is carried out in combination with other techniques.

Do the pins used in TTT need to be removed later?

If there’s no irritation or infection, we usually leave it as is. However, if problematic symptoms develop, we may consider surgical removal.

Is it safe to have surgery on both knees at the same time?

It’s possible, but the recovery period becomes more challenging. We usually recommend staggering the procedures, doing one side at a time.

When can my pet start going for walks after surgery?

Immediately after surgery, only short walks for bathroom breaks are allowed. Regular walks should not begin until at least 6 to 8 weeks later, and only with your veterinarian’s approval.

Is it possible to manage the condition with medication instead of surgery?

For grade 1-2 luxations, if there is no pain, it is possible to monitor the condition through weight and exercise management. For grade 3-4 luxations, surgery is the standard treatment.

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References

[1] Textbook of Veterinary Orthopaedic Surgery, Chapter 11: Stifle Joint Disorders

[2] Clinical Medicine of the Dog and Cat, 4th Ed, Patellar Luxation Pathophysiology

[3] 100 Top Consultations in Small Animal General Practice, Patellar Luxation