What is a TTA?
TTA stands for tibial tuberosity advancement, and is one of the techniques available for stabilization of cranial cruciate ligament deficiency in dogs. This technique was invented by Dr. Slobodan Tepic and Dr. Pierre Montabon in Zurich, and was launched by Kyon in 2004 following three years of clinical testing.
TTA involves an osteotomy of the non-weightbearing portion of the tibia. This section of the bone called the tibial tuberosity is moved forward so that the patellar ligament is aligned on a 90 degree angle with the tibial plateau. By doing this, you change the angle of the forces applied to the knee during stride which gives stabilization to the joint.
Implants used to keep the tibial tuberosity in place (as seen in this radiograph of a CVSS patient), includes a cage which is placed on the end of the osteotomy closer to the joint and is secured by two titanium screws to keep the space between the tibial tuberosity and the tibia. Also, a tension band plate secures the tibial tuberosity to the tibia and is secured by an an pronged implant called a fork and additional cortical screws.
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