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Unfortunately
luxating patella's
are not that uncommon in bassets.
In certain breeds that have extremely short legs such as the Basset Hound or Dachshund, patellar luxation is thought to be secondary to the abnormal shape of the femur and tibia. The curvatures of the bones in these breeds work in conjunction with the forces of the quadriceps muscles to displace the patella to the inside. Please do not misunderstand - not all members of these breeds are affected with patellar luxation, only a small portion.
Given the age of the hound and the fact that it is a male I would want to rule out Pano as the cause before going to a surgical option. Regardless of your vets recomendations I would strongly recommend a second opinion from a vet that specialize in orthopaedics

That said if the cause of the limping is Luxating Petella, billateral (effecting both legs) is more common that just a single leg. There is thought to be a strong genetic component to this condition so if you know the Breeder they should be informed. Surgery done early has a very good prognoses of success. It is far better to get the problem corrected early before any arthitis develops. I know a couple bassets currently competing in agility that had surgery done on both knees for this condition so the prognose after surgery is usually good. The simple explanation of found on web sites that the cause of Patellar Luxations is caused by a too shallow groove that the knee cap sits in is an over simplication of the problem though it is true in some cases. Often the cause is multifacited and may require quite extensive surgery to correct. From Cyber-Bibliotecha
When patellar luxations are present early in life, the major muscle groups of the thigh pull toward the inside of the leg, putting abnormal pressure on the knee joint cartilage. The result is a bowlegged stance and an abnormal pull on the patella (fig.1). Therefore, the statement \"patellar luxation is an anatomic malformation not merely of the knee but of the entire pelvic limb\"? accurately describes the complexity of a seemingly simple luxation. Thus, a number of anatomic pelvic limb deformities can lead to or result from the structural manifestation of medial patellar luxation. These include bowed legs, coxofemoral (hip) joint abnormalities, and outward rotation of the limb.
...Because there is great individual variation in the pathologic deformities seen, a graded classification of medial patellar luxation (Putnam 1968) has been formulated as a basis for recommending which type of surgical repair is most appropriate for each individual.

...The most commonly accepted surgical procedures include...
1) Deepening the trochlear groove.
2) Tightening the tissues around the joint.
3) De-rotating the femur or tibia.
4) Repositioning the patellar ligament attachment to the tibia.
The post op can be a real hardship trying to keep a young pup quite and confined without driving it or yourself insane. It is a real test of patience.

links
from the Text book of small animal orthopaedics
Patellar Luxation - Chapter 81

CANINE PANOSTEITIS - CHAPTER 49

Orange Villa Veterinary Medial luxating patella
 
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