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What is Tibial Tuberosity Advancement - TTA

The most common knee injury in the dog is rupture of the Cranial Cruciate Ligament (CCL), also frequently referred to as the Anterior Cruciate Ligament (ACL).  This injury can occur at any age and in any breed, but most frequently occurs in middle aged, overweight, medium to large breed dogs.  This ligament frequently can suffer a partial tear, leading to slight instability of the knee. If this damage goes untreated, it most commonly leads to complete rupture and possibly damage to the medial meniscus of the knee.  The meniscus acts as a cushion in the knee.   Complete rupture results in front-to-back instability, commonly called Tibial Thrust, and internal rotation of the lower leg, commonly called Pivot Shift.  Untreated legs usually become very arthritic and painful from the instability.

An injured Cruciate Ligament can only be corrected by surgery. There are numerous surgical corrections currently being performed. The most common are 1) External Capsular Repair, 2) TightRope Procedure (a variation of the External Capsular Repair), 3) Tibial Plateau Leveling Operation (TPLO), and 4) Tibial Tuberosity Advancement (TTA). 

The forces within the knee are very complicated and change as the knee is rotated through its range of motion. In a normal standing position there is a tendancy for the lower end of the Femur to slide backwards on the tilted Tibial Plateau, this is called Tibial Thrust. This force can be corrected by either cutting the Tibial Plateau and rotating it into a more flat position (TPLO) or by counteracting this force by changing the angle of pull of the very strong Patellar Tendon by advancing the Tibial Tuberosity (TTA). It has been shown that the TPLO procedure can still allow rotational instability (Pivot Shift) and this may lead to the progression of arthritis as the dog ages. This Pivot Shift does not seem to be a problem with the TTA procedure because it results in more control of rotation by the large quadriceps muscle which pulls on the Patellar Tendon.  The difference in the physics have been worked out quite well by the researchers.  Anyone interested in the details can easily find them by doing an internet search on “TTA vs. TPLO”.

 

The normal Knee Joint (also know as the Stifle joint, has multiple structures which are important to its function. This drawing shows a view from the front with the muscles removed. It is important to note that the Patellar Tendon, a vital structure in the joint has been removed, so that you can see “behind” it. The Patellar Tendon is a thick, tough band that runs from the Patella (green dot) to the Tibial Tuberosity (red dot).

*Information and Images Provided by TTASurgery.Com

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