Dog Patellar Luxation: Managing a Common Orthopedic Problem

Patellar luxation — dislocation of the kneecap — is one of the most common orthopedic conditions in dogs, particularly small breeds, causing pain, lameness, and progressive joint damage if untreated.

Key Facts

Patellar luxation affects an estimated 7% of puppies and is most common in small breeds including Chihuahuas, Toy Poodles, and Pomeranians
The condition is graded 1-4 based on severity, from occasional luxation that self-corrects to permanent dislocation
Medial luxation (kneecap dislocating inward) is more common in small breeds; lateral luxation is more common in large breeds
Grade 3-4 luxation typically requires surgical correction to prevent progressive osteoarthritis
Untreated severe luxation causes chronic pain and eventually complete inability to use the affected limb
The condition has a significant hereditary component — affected dogs should not be used for breeding

Welfare Considerations

Patellar luxation causes pain that varies with severity from intermittent discomfort when the kneecap slips to chronic constant pain in permanent dislocation. Dogs with Grade 1-2 luxation may show skipping gait when the kneecap slips and then self-corrects — owners often mistake this for normal behavior rather than pain. Grade 3-4 luxation causes progressive joint damage and significant chronic pain from abnormal joint mechanics and secondary arthritis. Surgical correction for severe grades provides genuine welfare relief, restoring normal joint mechanics and preventing the accumulating damage of untreated luxation. The hereditary component creates a welfare obligation in breeding — selecting against patellar luxation reduces the prevalence of inherited pain in future generations.

What You Can Do

Have small breed puppies examined for patellar luxation as part of initial health assessment
Recognize the skipping gait pattern that indicates intermittent patellar luxation in your dog
Discuss surgical correction with a veterinary orthopedic specialist for Grade 3-4 luxation
Manage weight carefully in affected dogs — every extra kilogram increases joint stress
Avoid breeding dogs with confirmed patellar luxation to reduce hereditary transmission
Ensure appropriate pain management if surgical correction is not immediately possible