Feline Patellar Luxation
Also known as: Luxating Patella, Kneecap Dislocation
⚠ Emergency Warning Signs
Not typically an emergency condition; sudden, severe inability to bear weight would warrant evaluation for a different, more acute problem.
Overview
Patellar luxation is a condition where the kneecap slips out of its normal groove, causing an intermittent or persistent hindlimb abnormality. It's less commonly discussed in cats than dogs (where it's a very well-known condition in small breeds) but does occur, and awareness of it in cats specifically has grown as veterinary orthopedic attention to the condition has increased.
Symptoms
- Intermittent hindlimb skip/hop
- Reluctance to jump
- Persistent lameness (higher grades)
Causes
Can be developmental (a structural predisposition present from a young age) or, less commonly, traumatic in origin. The kneecap slipping out of its normal groove, patellar luxation in cats is less common than in small-breed dogs but does occur, sometimes congenitally (present from an early age due to how the joint developed) or following trauma — genuinely can occur without obvious lameness in milder cases, sometimes only noticed as an occasional skip or hop in the cat's gait rather than persistent limping.
Risk Factors
No strong universally-established breed predisposition in cats the way there is in certain small dog breeds, though some studies suggest possible breed-associated patterns; overall a less common diagnosis in cats than dogs.
Transmission
Not applicable — not an infectious disease; developmental cases have a structural/possibly hereditary component relevant to breeding decisions.
Incubation Period
Not applicable; developmental cases are present from a young age, though signs may not become obvious until later.
Disease Stages & Progression
Graded by severity from occasional, self-correcting slipping (lower grade) to a kneecap that's permanently out of place (higher grade); can be present in one or both hind legs.
Early Warning Signs
An intermittent skip or hop in the hind leg gait, sometimes barely noticeable and easy to miss or dismiss.
Advanced Symptoms
More persistent lameness, reluctance to jump, and in higher-grade cases, a visibly abnormal hindlimb gait or posture; secondary osteoarthritis (see that disease page) can develop over time from the joint instability.
Diagnostic Methods
Physical exam manipulation of the kneecap (assessing how easily it luxates and whether it self-corrects) combined with X-rays. Physical examination, manually assessing whether the kneecap can be displaced from its normal position and how easily it returns, is the primary diagnostic method; X-rays help assess the joint's overall structure and rule out other contributing factors or additional joint damage.
Veterinary Examination Process
Gait observation and manual assessment of the kneecap's stability and grade of luxation.
Recommended Lab Tests
Pre-anesthetic bloodwork if surgery is planned.
Diagnostic Imaging
X-rays confirm the diagnosis and assess for any secondary joint changes.
Blood Test Indicators
Not diagnostic; used for pre-anesthetic screening if surgery is being considered.
Biopsy / Histopathology
Not applicable.
Differential Diagnoses
Other causes of hindlimb lameness or gait abnormality — hip dysplasia, cruciate ligament injury, or other orthopedic conditions — physical exam and X-rays distinguish these.
Home Monitoring Guidance
Watching gait for any skip/hop pattern and its frequency or progression over time.
Veterinary Treatment Options
Lower-grade cases with infrequent, self-correcting luxation and minimal discomfort may be managed conservatively (weight control, joint supplements); higher-grade or symptomatic cases often benefit from surgical correction to realign the kneecap's track, performed by a veterinary surgeon. Milder, infrequent luxation not causing significant lameness may simply be monitored; more persistent or higher-grade luxation causing regular lameness or discomfort may benefit from surgical correction, which realigns the structures guiding the kneecap's movement to keep it properly tracking within its groove.
Surgery Requirements
Surgical correction is commonly recommended for higher-grade or symptomatic cases to prevent progressive joint damage and improve comfort/function.
Recovery Timeline
Surgical recovery typically takes 6-8 weeks with appropriate activity restriction; conservatively-managed cases don't have a defined recovery timeline since the condition itself persists, managed rather than resolved.
Possible Complications
Secondary osteoarthritis from chronic joint instability if left untreated or unmanaged.
Long-Term Management
For conservatively-managed cases, ongoing weight control and monitoring; post-surgical cases are typically monitored for successful healing and return to normal function.
Prevention
No well-established specific prevention for the developmental form; maintaining a healthy weight reduces joint stress regardless.
Vaccination Availability
Not applicable — not an infectious disease.
Prognosis
Good, particularly with appropriate management (conservative or surgical) matched to the case's severity.
References
American College of Veterinary Surgeons feline orthopedic resources.
Medications Used
- Pain relief / anti-inflammatory medication as needed
- Joint supplements for cats managed conservatively
Estimated Treatment Cost by Country
| Country | Estimated Cost Range | Notes |
|---|---|---|
| IN | 15,000–60,000 INR | |
| US | 1,800–4,500 USD | |
| UK | 1,400–3,500 GBP | |
| AU | 2,200–5,500 AUD | |
| JP | 100,000–350,000 JPY | |
| DE | 1,400–3,500 EUR | |
| BR | 3,500–9,000 BRL |
Frequently Asked Questions
Is this common in cats?
It's genuinely less commonly diagnosed in cats than in some small dog breeds where it's very well known, but it does occur and is likely somewhat under-recognized given less routine screening attention in cats.
Does my cat need surgery?
It depends on the grade and how much it's actually affecting your cat — lower-grade, infrequent, minimally-symptomatic cases are sometimes managed without surgery, while higher-grade or clearly bothersome cases often benefit from surgical correction.
What's that occasional skip in my cat's back leg?
It could be patellar luxation, among other possibilities — worth having your vet take a look, since an intermittent hindlimb skip is a recognizable, describable sign specific enough to be worth mentioning at a visit rather than dismissing as nothing.
Will this get worse over time?
It can, particularly if left unaddressed — chronic joint instability can lead to secondary osteoarthritis, which is part of why higher-grade cases are often recommended for surgical correction rather than just monitoring indefinitely.