Luxating patella, or trick knee, is a condition in which the
kneecap, dislocates or moves out of its normal location. The luxation is
usually medial, but can be lateral. It can be caused by some form of
blunt trauma, or may be a
defect. In congenital cases, it is usually bilateral. Patellar luxation
is a common condition in dogs,
particularly small and miniature breeds. The condition usually becomes
evident between the ages of 4 to 6 months. It also occurs in
cats, especially the
Diagnosis is made through palpation of the knee. Rarely,
x-rays are necessary. The
luxating patella often causes no or very slight symptoms. There may be
intermittent limping in the rear leg.
can develop secondarily. There are several stages in patellar luxation, ranging
from minor (the patella's position is normal most of the time) to very serious
(the patella is permanently luxated). The more serious stages require
surgery to correct, if
the animal has difficulty walking. The surgery involves deepening the groove (trochlea)
that the patella sits in.
- Ettinger, Stephen J.;Feldman, Edward C.(1995).Textbook of Veterinary
Internal Medicine(4th ed.). W.B. Saunders Company.
| Legg-Calvé-Perthes Syndrome
| Luxating Patella
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