Dog Luxating Patella: Grades, Symptoms & Surgery Options

Last updated: May 6, 2026

You are watching your dog trot across the living room when, mid-stride, they suddenly lift a back leg for a few steps, skip along on three legs, and then drop back to normal as if nothing happened. That brief hitch is one of the most recognizable signs of a luxating patella in dogs — a condition where the kneecap slides out of its normal groove. It is one of the most common orthopedic issues veterinarians diagnose, particularly in small breeds, and understanding it can make a real difference in how you manage your dog’s comfort and long-term mobility.

What Is a Luxating Patella in Dogs?

The patella, or kneecap, is a small bone that sits in a groove at the front of the knee joint called the trochlear groove. In a healthy leg, the patella glides smoothly within this groove as the dog bends and straightens the knee. A luxating patella occurs when the kneecap slips out of that groove, moving either to the inside or outside of the leg. When out of position, the dog cannot fully extend the knee — which is why you see that characteristic skipping motion.

In mild cases the patella pops back on its own within seconds. In severe cases it stays dislocated permanently, causing ongoing lameness and joint damage. The condition affects the hind limbs almost exclusively and is usually caused by genetic skeletal factors — a shallow trochlear groove, misalignment of the tibia, or an abnormal femoral angle — rather than a single traumatic event.

Medial vs. Lateral Luxating Patella

In a medial luxation, the patella slides toward the inside of the leg. This accounts for roughly 80 percent of cases and is especially common in small and toy breeds. In a lateral luxation, the patella slides outward. Lateral luxation is seen more often in large and giant breeds and tends to cause more significant problems because the mechanical forces are greater. Some dogs develop bilateral luxation — both knees affected — which can be harder to spot because there is no obviously normal leg for comparison.

Luxating Patella Grades: 1 Through 4

Veterinarians grade luxating patellas on a scale of 1 to 4, which directly guides treatment decisions.

Grade 1. The kneecap can be manually pushed out of the groove but returns on its own when released. Dogs rarely show lameness. Many owners are unaware of the problem until a routine exam. Grade 1 typically does not require surgery.

Grade 2. The patella pops out during normal movement or manual manipulation but can be repositioned by hand or when the dog straightens the leg. This is where owners first notice intermittent skipping. Some dogs manage well without surgery; others progress and eventually need it.

Grade 3. The kneecap is out of the groove most of the time. It can be pushed back manually but luxates again almost immediately. Dogs often carry the leg or walk with a crouched posture. Arthritis typically begins at this stage. Surgery is generally recommended.

Grade 4. The patella is permanently dislocated and cannot be replaced into the groove. The trochlear groove is very shallow or flat. Dogs walk with a noticeably bowlegged or knock-kneed stance. Surgery is necessary, though correction is more involved.

Symptoms of Luxating Patella in Dogs

Intermittent skipping or hopping. The hallmark symptom — a dog suddenly lifts one hind leg mid-walk, skips forward, then resumes normal walking once the kneecap pops back.

Bunny hopping. Dogs affected in both legs may propel both hind legs forward simultaneously rather than alternating them, reducing stress on unstable knees.

Sudden yelp or leg kick. An abrupt luxation can cause the dog to cry out and reflexively kick the leg straight, which sometimes snaps the kneecap back into position.

Reluctance to jump or climb. Dogs may avoid stairs, furniture, or getting into the car — activities requiring hind leg power.

Stiffness after rest. Dogs with secondary arthritis may be noticeably stiff when rising from a nap and loosen up after a few minutes of movement.

Dog Breeds at Risk

Luxating patella is disproportionately common in small and toy breeds. The most frequently diagnosed include Chihuahuas, Yorkshire Terriers, Pomeranians, Maltese, Miniature and Toy Poodles, Papillons, Boston Terriers, French Bulldogs, and Cavalier King Charles Spaniels. Among larger breeds, lateral luxation occurs in Labrador Retrievers, Golden Retrievers, Great Danes, and Akitas, sometimes alongside hip dysplasia or cruciate ligament tears.

Because the condition has a strong genetic component, knowing about it before adoption helps you plan for veterinary monitoring. Browse adoptable dogs on our adoption page, and visit our dog breeds directory for more on breeds commonly affected.

How Luxating Patella Is Diagnosed

A veterinarian can detect a luxating patella during a physical examination by manipulating the kneecap and feeling whether it slides out of the groove. This palpation test is how the grade is assigned. Radiographs are recommended if surgery is being considered, helping assess groove depth, bone alignment, and any existing arthritis. For complex cases in larger dogs, a CT scan may be used to plan the surgical approach. Grades can change over time, so regular veterinary check-ups allow the condition to be tracked.

Conservative Management

Not every luxating patella requires surgery. For grade 1 and many grade 2 dogs without significant lameness, conservative management can maintain quality of life.

Weight management is the single most impactful factor. Every extra pound increases force on the knee and accelerates cartilage wear. Exercise modification — consistent leash walks, swimming, and controlled trotting — maintains the quadriceps muscle that stabilizes the kneecap. Avoid sudden turns, hard stops, and repetitive jumping. Joint supplements such as glucosamine, chondroitin, and omega-3 fatty acids may offer modest benefit in slowing cartilage degradation. Anti-inflammatory medications (NSAIDs) can manage flare-ups but do not address the structural problem. Physical rehabilitation — including underwater treadmill work and targeted exercises — strengthens the muscles around the knee and improves hind limb function.

Surgery for Luxating Patella: When Is It Needed?

Surgery is recommended for grade 3 or 4 luxation, progressive grade 2 with persistent lameness, and any dog whose quality of life is meaningfully impaired. Several techniques are often combined:

Trochleoplasty deepens the trochlear groove so the kneecap has a more secure channel. A wedge of bone is removed and reset deeper, preserving the cartilage surface. Tibial tuberosity transposition repositions the patellar ligament attachment to realign the quadriceps mechanism, pinning it in place with a small metal pin. Soft tissue reconstruction tightens the joint capsule on the luxation side and releases it on the opposite side. Corrective osteotomy — cutting and realigning the bone itself — is reserved for severe grade 4 cases with significant rotational deformity.

Success rates are good: approximately 90 percent of dogs show significant improvement, with recurrence rates of 10 to 15 percent. Outcomes are best when surgery is performed before significant arthritis develops.

Recovery After Surgery

Recovery requires six to eight weeks of restricted activity, with full recovery at three to four months. The first two weeks are the most restrictive — short leash walks for bathroom breaks only, with crate rest when unsupervised. From weeks two through six, activity gradually increases under veterinary guidance. Most dogs are cleared for normal activity by 10 to 12 weeks.

The most common complication is doing too much too soon. Dogs feel better before they are healed, and restraining an enthusiastic dog for weeks is genuinely challenging — but essential. Implant failure and re-luxation are more likely when activity restrictions are not followed.

How Much Does Luxating Patella Surgery Cost?

Costs vary by location, severity, and whether a general surgeon or board-certified specialist performs the procedure. Most owners pay between $1,500 and $3,500 per knee. Complex grade 4 cases at specialty hospitals can reach $5,000 or more. This typically covers the workup, anesthesia, surgery, medications, and initial follow-ups. If both knees need surgery, they are usually done six to eight weeks apart, effectively doubling the total.

Pet insurance can offset this expense significantly if the policy was in place before diagnosis. Given how common the condition is in small breeds, insurance is worth considering early in your dog’s life.

Preventing Progression

You cannot change the anatomy your dog was born with, but you can slow progression meaningfully. Keep your dog lean — this matters more than any other single factor. Build muscle through regular, moderate exercise like walking, trotting, and swimming. Provide good footing — slippery floors cause dogs to splay their legs and stress the knees, so add area rugs or grip mats. Limit high-impact activities like repetitive jumping; provide ramps or steps for furniture and cars. And stay current on veterinary check-ups so changes can be caught early, when intervention is most effective.

Frequently Asked Questions

Can a luxating patella fix itself?

No. The structural factors — a shallow groove, bone misalignment — do not resolve on their own. A grade 1 or mild grade 2 may remain stable for life, but the anatomy does not self-correct. Conservative management keeps dogs comfortable and slows progression but does not reverse the condition.

Is luxating patella painful for dogs?

It can be. Mild, infrequent luxation may cause only a momentary hitch. But repeated luxation leads to inflammation, cartilage wear, and arthritis — all of which are painful. Dogs are stoic about chronic orthopedic pain, so working with your veterinarian proactively is better than assuming no obvious signs means no discomfort.

At what age does luxating patella appear?

In small breeds, it is often detectable by four to six months, with clinical signs by one to two years. Some cases are not identified until later in life because they were mild enough to escape notice or have progressed with age.

Can dogs live a normal life with a luxating patella?

Many dogs with grade 1 or well-managed grade 2 live completely normal, active lives. For dogs that need surgery, outcomes are generally excellent and most return to full activity. The key is not ignoring the condition — staying on top of it prevents a minor issue from becoming a major one.

Should I adopt a dog with a luxating patella?

Absolutely. It is a manageable condition, not a reason to pass on an otherwise wonderful dog. Many dogs with grade 1 or 2 never need surgery. Ask the rescue about the grade, which legs are affected, and what treatment has been started. Visit our adoption page to find dogs looking for homes — some of the best companions come with a quirky knee or two.