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33rd Annual Scientific Meeting proceedings

Stream:   |   Session: Short Communications Orthopaedic + Neuro
Date/Time: 08-07-2023 (16:45 - 17:00)   |   Location:
Biomechanical evaluation of a novel fixation technique with a single length of orthopedic wire for tibial tuberosity transposition: an ex vivo cadaveric study
Natsios P1, Capaul R1, Kopf N2, Pozzi A*1, Tinga S3, Park B1
1Small Animal Surgery Clinic, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland, 2Tierklinik Breitensee, Vienna, Austria, 3Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, USA.

The purpose of the tibial tuberosity transposition (TTT) is to correct the extensor mechanism alignment. A novel fixation technique of TTT using a single length of orthopedic wire without pins was investigated in a single load to failure mechanical test.

Materials and Methods
Thirty healthy cadaveric stifles from dogs weighing between 5.2 and 13.1 kg were randomly assigned to 3 treatment groups: Group 1: novel fixation technique; Group 2: two pins (2Pins); Group 3: two pins and a tension band wire (2Pins+TBW). The tibiae were mounted on an Instron-3000 testing machine and positioned to simulate a 135° stifle flexion angle. Tensile force was applied to the patellar ligament until catastrophic failure. A one-tailed independent two-sample t-test was used to compare stiffness and maximum load at failure between groups. A p-value less than 0.05 was considered statistically significant for all analyses.

Mean stiffness for the tension modified-hemicerclage (38.1 N/mm ± 7.1N/mm) and the 2Pins+TBW (40.2 N/mm ± 9.3N/mm) was significantly higher compared to the 2Pins technique (26.7 N/mm ± 6.7) (p=0.0015 and p=0.0016 respectively). There was no significant difference between the tension modified-hemicerclage technique and 2Pins+TBW in stiffness (p=0.60), and total failure load (p=0.39). The 2Pins technique (284.3N ± 70.5 N) failed at a significantly lower load compared to the tension modified-hemicerclage (555.7N ± 225.9N, p=0.05) and 2Pins+TBW techniques (715.3N ± 339.8N, p=0.001).

A novel fixation technique using a single-length orthopedic wire demonstrated similar strength and stiffness as the 2Pins+TBW technique and was superior to the 2Pins technique.

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