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Tibial Tuberosity Advancement (TTA)
Tta Rad

Information about the procedure for referring vets.

Following work published by Tepic and Montavon in 2002 that demonstrate that weight bearing forces were approximately aligned parallel to the patella tendon, the TTA procedure was developed to stabilise cranial cruciate ligament deficient stifles.

It is theorised that at stifle flexion angles of less than 90*, the joint is stabilised by the caudal cruciate ligament. At angles over 90* the cranial cruciate ligament stabilises the joint. The 90* angle is termed the cross-over point, and if the tibial crest is advanced so that the patella tendon angle does not exceed 90* at any phase of flexion or extension of the stifle, the joint will be stabilised throughout by the caudal cruciate ligament, making the cranial cruciate ligament redundant.

Since then the TTA procedure and its variations have become widely accepted in small animal practice. At Rata alone we have performed this procedure over 1000 times in the last few years.