A luxating patella is a condition when the patella, or kneecap, dislocates or moves out of its usual position. This condition is also known as a trick knee.

 

 

Especially in little and miniature breeds of dogs, patellar luxation is a prevalent issue. In most cases, the problem doesn’t appear until between 4 and 6 months. It can also affect cats, particularly domestic short-haired cats. It also happens in people, and anterior cruciate ligament injury may be a contributing factor in those cases.

There have been numerous cases of patella luxation in animals of different species, including goats, cattle, alpacas, and miniature pigs.