The first part of this study presents the preoperative planning for circular Tibial Tuberosity Advancement (cTTA), a novel method for the treatment of canine cranial cruciate ligament rupture. The first section of the present article is a brief summary of the condition and the surgical techniques used. CTTA was developed by MASSIMO PETAZZONI, an Italian veterinary surgeon as a modification of Tibial Tuberosity Advancement (TTA). Both correction techniques are based on the same principle, the planning methods are very similar. To the authors' knowledge, there are only two studies available on cTTA to date, both of which providing little information on preoperative planning. The authors' planning method is based on the common tangent and tibial plateau slope techniques (normally used for TTA) with modifications, in order to determine the ideal degree of correction more accurately.

The second part of the study presents a detailed description of the surgical technique and early results with circular Tibial Tuberosity Advancement (cTTA), a novel method for the treatment of canine cranial cruciate ligament rupture. For preoperative planning, see part one of the present article. The technique is based on Tibial Tuberosity Advancement (TTA), sharing the same principle of biomechanical stabilization. To the authors knowledge, there are only two studies available on cTTA to date. The study involved 16 patients, followed up to two weeks after implant removal. omplications occurred in seven patients (43.75%), one of which had two different complications at two different periods of time. Though the rate of complications might seem high, all were classified as minor, and none required reoperation. After the removal of the implants, all patients performed well.

The authors have found in a 23-month-old British shorthair cat epiphyseal dysplasia and patella luxation together. Separation of the femoral capital epiphysis is associated with severe trauma, but atraumatic slipped capital femoral epiphysis has also been described in cats. In this case a 23-month-old neutered, overweight, male cat was presented with hind limb lameness. At the physical examination the patient could not stand up on hind limbs, the rotation of the hip was painful, and in both of the patella grade II. medial luxation was diagnosed. Neurological failure was not diagnosed. The blood test showed elevated blood glucose and fructosamine values. Pelvic radiographs showed femur proximal epihyseolysis affecting both sides. Because the pain was elicited upon palpation of the hip area, hence femoral capital resection was made first on one side and one month later on the other side. After the femoral head removal the sample was admitted for histopathological examination. The diagnosis was epiphyseal dysplasia with slipped capital femoral epiphysis. The epiphyseal dysplasia is a known disease in cats, but according to the authors' knowledge there have been no reported cases of concomitant occurrence with patella luxation, and beginning diabetes mellitus.