It is a common disorder detected in tiny breeds of dogs such as Pomeranians. In a dog with patella luxation, the kneecap (patella), slips out of its real position, either towards the inner side of the knee, the medial patellar luxation (MPL), or the outer side of the knee, the lateral patellar luxation (LPL). This painful condition forces the dog to hold the affected rear leg up every few steps. It suffers from lameness and is unable to put weight on the affected leg.
Symptoms: When the dog repetitively stretches its hind leg, holds up a rear leg every few steps while walking or running and screams out.
Four Grades of Patellar luxation:
- Grade 1: The Patella can be pushed out of position and manually returns back to its original position (slightly affected and no surgery is required).
- Grade 2: The Patella can instinctively be pushed out of position and does not return back to its original position (slightly affected, but minor surgery is required).
- Grade 3: The Patella is continuously dislocated and when pushed back into its original position, quickly pops back out (Surgery and Tibial tuberosity transplant is required).
- Grade 4: The Patella is permanently dislocated and cannot be pushed back into its original position (Surgery and Tibial tuberosity transplant is required).