the chihuahua breed is known to have the knee condition known as patellar luxation and is one of the most common health problems associated with chihuahuas. the knee is a complex structure consisting of muscles, ligaments, tendons, cartilage, and bones. these components must align properly and interact harmoniously in order to function properly. three bones are included in the knee: the femur, the tibia, and the patella (kneecap).
the lower front portion of the femur (thigh bone) in a normal chihuahua has two bony ridges that form a fairly deep groove in which the patella is supposed to slide up and down. these structures limit the patella’s movement to one restricted place, and in doing so, control the activity of the quadriceps muscle. the entire system is constantly lubricated by joint fluid. it works so that there is total freedom of motion between the structures.
diagram of the anatomy of a normal knee cap
when does patellar luxation (trick knee, subluxation of patella, or floating patella) occur? find out in caring for your chihuahua made easy
what causes patellar luxation in chihuahuas? find out in caring for your chihuahua made easy
what are the symptoms of patellar luxation in chihuahuas? find out in caring for your chihuahua made easy
how do you know if your chihuahua will require surgery if they have patellar luxation? find out in caring for your chihuahua made easy
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related: what is a teacup chihuahua?
references: peteducation.com/article.cfm?c=2+2084&aid=457 – drs. foster & smith, inc.