'Viva Liberty', a 16 week old Warmblood filly, presented to the Cornell Large Animal Surgery Service with a chief complaint of bilateral stifle effusion and lameness. History: Weaning from nursing at three weeks of age and hand raised thereafter. Progressive lameness and swelling for 8 weeks in duration. Two referring veterinarians had seen the filly prior to her presentation at Cornell. Physical Exam/Problem List: 'Viva Liberty' had extensive effusion in both stifles. Her patellae intermittently luxated laterally in both stifles. All other parameters were within normal limits. Radiology: Radiographs of the stifles exhibited severe osteochondrosis of the lateral trochlea of both the left and right femur. Skyline radiographs displayed an appropriate trochlear groove. Based on these presenting signs, a decision was made to treat 'Viva Liberty' surgically. Dr. Bramlage from Rood and Riddle was consulted on surgical intervention in cases of lateral trochlea osteochondrosis with concurrent luxating patella. The filly was taken to surgery where her patellae were secured in the trochlear groove by reconstructing the medial femoropatellar ligament with screws and suture. Despite the success of the surgery immediately post-op, the decision was made 6 weeks after surgery to have the filly euthanized due to the severity of the osteochondrosis lesions, and poor prognosis on further surgical intervention.