10/20/2026
Cruciate ligament tears cause a majority of cases of hind end lameness cases we see in dogs. The cruciate ligament is analogous to a human’s ACL, located at the knees. ACL tears in humans most often come from trauma, but cruciate tears in dogs are most often the result of degeneration over time. Larger, middle-aged dogs are the most common culprits, but it happens to dogs of any age or breed.
It starts with your dog suddenly not wanting to put weight on one of their hind legs despite being fine a few minutes ago. When you come in for an appointment the doctor will examine them to isolate where their discomfort is coming from and rule out other causes, but to diagnose a torn cruciate requires x-rays. Because these x-rays require precise angles and are uncomfortable on an injured leg, we do them with sedation and extra pain medication on board. We also look at both legs, because dogs with one torn cruciate have a very high likelihood of tearing the other. This not only allows us to diagnose cruciate tears, but also tells us if your pet is a good candidate for repair surgeries like the TPLO.
Dr. Blake recently trained to perform tibial-plateau-leveling osteotomies (TPLOs) in dogs. TPLO surgery changes the angle where the tibia and femur meet by cutting and plating the tibia to make the joint stable even without the ligament. There are multiple possible surgeries to correct cruciate tears, but the TPLO consistently restores dogs to the closest to normal function after surgery. Post-op care requires several weeks of strict rest, but with diligent follow-up care including rechecking radiographs to carefully monitor progress and shockwave therapy to encourage healing, your dog will enjoy a return to the life they led before their injury.
[These x-rays are from Rosie, who came to us from Animal Orphanage (Old Town, Maine) for surgery. The first two are pre-op and show some of the precise measurements needed for surgical repair, while the final one shows what the joint looks after. The last shows Dr. Blake and his family, including his dogs Cub, Archie, and Cygnus.]