There are four grades of patellar luxation:
- Grade I- the kneecap can be manually luxated but the kneecap returns to its normal position when the pressure is released.
- Grade II- the kneecap can spontaneously luxate out of position with just normal movement of the knee.
- Grade III- the kneecap remains luxated most of the time but can be manually reduced into the normal position.
- Grade IV- the patella is permanently luxated and can not be manually repositioned
Dogs frequently start with a Grade I or Grade II and worsen over time to a Grade III or IV. Many people are not aware their pet is affected, but a luxating patella can cause pain. Owners may see the pet limp on a rear leg, or they may see them shake a rear leg to try to snap the kneecap back into place.
A serious consequence of patellar luxation is that it predisposes the dog to a rupture of a ligament inside the knee called the anterior cruciate ligament (ACL). ACL ruptures are very painful, at least initially, and usually the dog doesn’t bear weight on the affected leg. Surgery is indicated for any case that is causing lameness or pain. Owners may also elect corrective surgery as a way to prevent an ACL.