Yorkshire Terrier Patellar Luxation — A Complete Guide to Stage-by-Stage Symptoms and Regular Screening

JointBreed HealthMeongsiljang Veterinary Advisory Board

Patellar luxation is a common hereditary joint condition that Yorkshire Terriers often live with throughout their lives. To catch any changes in the severity grade early, it’s essential to know the recommended age-specific screening schedule and key home care tips.

Yorkshire Terriers and the Patella — Why Lifelong Management Is Necessary

A Yorkshire Terrier sitting comfortably on its owner's lap.

Yorkshire Terriers are a quintessential small breed that requires lifelong management for hereditary joint conditions, including patellar luxation. The most critical aspect is monitoring changes in the luxation grade. Begin with knee palpation exams starting at six months of age, and track any grade changes at least once a year. Keep in mind that the grade isn't a one-time, fixed determination; it can change throughout your dog's life depending on their activity level, body weight, and muscle mass.

Why Yorkshire Terriers Are Prone to Patellar Luxation

According to veterinary internal medicine textbooks, patellar luxation does not result from a single cause. It is a developmental issue that arises from factors such as inward bowing of the femur, a shallow trochlear groove, inward deviation of the tibial tuberosity, and weakness in the soft tissues—including ligaments and muscles—that stabilize the patella. These factors may act alone, but more commonly, they combine to cause the condition. Even in small breeds like Yorkshire Terriers, these developmental factors can overlap, leading to knee joint instability. Therefore, rather than attributing the condition to one primary cause, it is more accurate to understand that multiple developmental factors work together, making it easier for the patella to slip out of the trochlear groove.

Checking Symptoms by Patellar Luxation Grade

The condition is classified into four grades, with clinical signs becoming more apparent in daily life as the grade increases. - Grade 1: The patella appears normal at rest but can be manually displaced and reduced. - Grade 2: The dog occasionally hops on three legs or limps for a few steps. - Grade 3: The patella is dislocated most of the time, and the dog walks with an inward-turned leg. - Grade 4: The patella is permanently dislocated, severely limiting leg use, and the sitting posture is asymmetrical.

An anatomical illustration showing the position of the patella in a dog's knee joint

Go to the Vet Immediately If You See These Signs

If your dog suddenly lifts a hind leg and limps, only to stop, and this happens two or three times a day or more, or if they refuse to jump or climb stairs as they normally would, it may indicate that the condition is progressing rapidly. In particular, if symptoms that were previously seen in only one leg spread to both, do not delay seeking veterinary care. Once the condition progresses to Grade 4, recovery with conservative treatment alone becomes difficult, and a decision for surgery may need to be made quickly.

Age-Specific Regular Screening Schedule

Yorkshire Terriers should begin patellar examinations before symptoms appear, not after pain sets in. Following this schedule ensures you won’t miss any changes in the patellar grade. - 6 months of age: Initial knee palpation exam (conducted alongside completion of vaccinations) - 12 months of age: Include patellar grade documentation in the first-year comprehensive health checkup - 2 to 6 years of age: Annual routine palpation - 7 years and older: Palpation every six months, with an annual X-ray recommended

Comparison of Management Approaches by Patellar Luxation Grade

Item	Grade 1	Grade 2	Grade 3	Grade 4
Everyday symptoms	Almost none	Intermittent limping	Persistent limping	Difficulty using the leg
Weight management	Essential	Essential	Essential	Essential
Joint supplements	Recommended	Recommended	Recommended	Combined use
Rehabilitation exercise	Mainly walking	Hydrotherapy recommended	Hydrotherapy essential	Post-surgical rehabilitation
Surgery consideration	Usually unnecessary	Consider if painful	Actively consider	Recommended as a rule

Owners should not judge the grade on their own; it must be confirmed by a veterinarian's palpation and imaging examination.

Lifelong Management Points You Can Do at Home

Daily care can influence the progression of the condition, regardless of whether surgery is performed. Here are some things you can manage every day: - Weight Management: As weight increases, so does the burden on the knees, so it's important to maintain a healthy weight consistently. - Non-slip Flooring: Place non-slip mats in living rooms and kitchens to prevent slipping. - Limit Jumping: Replace jumping on sofas or beds with using stairs or ramps. - Strengthening Hind Leg Muscles: Regularly walk on flat ground within safe limits, and if possible, consult your veterinarian about incorporating rehabilitation exercises. - Nail and Paw Hair Care: Trim nails and paw hair frequently to reduce slipping.

A Yorkshire Terrier walking on a flat surface over a non-slip mat.

What You Must Know Before Deciding on Surgery

Patellar luxation surgery isn’t automatically indicated just because the grade is high. The decision is based on a comprehensive assessment of pain frequency, the grade of the other knee, whether there’s concurrent cruciate ligament injury, and the dog’s age and weight. In dogs with patellar luxation, the cranial cruciate ligament can rupture over time, so it’s important to evaluate the condition of the knee ligaments both before and after surgery. If the surgery is successful and the osteotomy site heals well, dogs typically return to normal activity gradually over 6–8 weeks. When both knees are affected, surgeries are often staged with a gap between them, so please discuss the plan thoroughly with a veterinary surgeon before making a decision.

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

Does a Grade 1 diagnosis mean my pet will never need surgery?

Grade 1 means the kneecap only dislocates when you touch the knee with your hand, and there’s usually little to no pain otherwise. In many cases, conservative management alone can help maintain this condition for a long time. However, since the knee condition can change over time, it’s a good idea to have regular palpation exams to monitor for any changes in grade.

Do joint supplements really work?

Joint supplements alone won’t lower your dog’s patellar luxation grade. The key to managing patellar luxation is maintaining a healthy weight and engaging in exercises that don’t strain the knees. Supplements should be viewed as supportive aids, and it’s best to consult with your veterinarian before using them.

How long should I walk my dog?

It's best to walk at a slow, steady pace on flat ground, ensuring it doesn't strain your pet. Avoid intense activities like sudden running, sharp turns, or frequent jumping, as these can put excessive stress on the knees.

If both knees are affected, should surgery be performed on both at the same time?

Typically, surgeries are performed on one leg at a time, with a gap between procedures. This approach allows the unaffected leg to bear weight during recovery, which is essential for effective rehabilitation. After surgery, it usually takes about 6 to 8 weeks for the pet to gradually return to normal activity levels, so the second surgery is often scheduled only after the first leg has fully healed.

Can surgery still be performed if the patellar luxation grade worsens in older dogs?

Age alone is not a contraindication to surgery. We assess anesthesia risk by checking heart, kidney, and liver function before administering anesthesia, then proceed accordingly. However, since recovery may be slower than in younger animals, it’s advisable to plan a more relaxed rehabilitation schedule.

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References

[1] Textbook of Veterinary Orthopaedic Surgery, Chapter 11 (Stifle Joint), 슬개골 탈구 진단·수술 챕터

[2] 100 Top Consultations in Small Animal General Practice, Patellar Luxation 섹션

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