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Originally Posted by donnarod  What is stage 3 LP? |
The patella slippage is graded on a scale of 1-4 with 4 being the worst. Grades 3 & 4 always require surgery.
Grade I -- The patella can be manually luxated but easily comes back into normal position. Patient may or may not occasionally carry the affected leg.
Grade II -- Patella luxates on flexion of the knee joint and remains out of place until manually replaced or patient extends and rotates joint. Patient intermittently carries the affected limb with the knee joint flexed.
Grade III -- Patella remains luxated most of the time but can be manually reduced (placed back into position). Flexion and extension of the knee joint reluxates the patella. Patient transfers most of the body weight to the front legs, bunny hops or carries the affected legs, and appears bowlegged or knock-kneed.
Grade IV -- Patella is permanently luxated and cannot be manually repositioned. The quadriceps muscle group starts to shorten, making it difficult to extend the leg fully. Patient transfers most of the body weight to the front legs, bunny hops or carries the affected legs, and appears bowlegged or knock-kneed. http://www.cpvh.com/Articles/78.html