TTA stands for Tibial Tuberosity Advancement.  TTA was developed in Switzerland by Dr. Slobodan Tepic in the late 1990's and has only been introduced here in the US for the last 4-5 years.  TTA uses the same concept of leveling the tibial plateau in relation to the dynamic transfer of force through the patellar tendon. 

Instead of rotating the bone to flatten the plateau like TPLO, a cut is made on the non-weight bearing front part of the tibia and the patellar tendon is advanced and plated as a wedge at a new perpendicular angle.  Because the cut is made on the non-weight bearing surface of the bone, recovery to walking and full use is 2-3 weeks faster than TPLO. Not every dog is a candidate for TTA, but it is the most common surgery we do for ACL repair in dogs over 60 pounds.

TPLO stands for Tibial Plateau Leveling Osteotomy.  It was developed by Dr. Barclay Slocum in the early 1990's in Oregon.  TPLO works by making a semi-circular cut in the tiba and rotating the piece backwards by a  pre-determined amount so the tibial slope is perpendicular to the patellar tendon.  The majority of dogs have a slope of 19- 23°. Goal of TPLO surgery is to reduce the slope to 5-15° degrees. Most dogs are weight bearing within a few days of discharge and are using the leg nearly normally within 8-10 weeks. See more information at: slocumenterprises.com