Surgical Correction of Congenital Bilateral Patellar Luxation in a Pup - A Case Report

K. Mohd. Arif Basha, K.M. Srinivasa Murthy, L. Ranganath


Luxation of patella may be congenital or traumatic origin, and can affect any breed. The congenital
form is related to developmental abnormalities of the limb that create malalignment of quadriceps
group of muscles. With underlying abnormalities of hip and stifle joint congenital lateral patellar
luxation have skeletal abnormalities like retroversion of femoral head and neck, coxa vara (altered
angle of inclination), genu valgum and shallow trochlear groove with poorly developed trochlear
ridges (Denny and Butterworth, 2006). Luxation of patella is a common cause of lameness in dog
which can be in medial or lateral displacement. The incidence of medial patellar luxation is 5 times
more than lateral luxation and is seen more in large breeds of dogs. Lateral patellar luxation may
predispose the dogs to knock knee (genu valgum) and cow hock (hock valgus) condition (Robins,
1990). The cause of lateral patellar luxation is unknown but is thought to be related to anteversion
or coxa valga of the coxofemoral joint, which shifts the line of force produced by the pull of
quadriceps lateral to the longitudinal axis of the trochlear groove. This abnormally directed lateral
force pulls the patella from the trochlear sulcus causing skeletal abnormalities (Fossum, 2002).



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