Effects of Osteotomy Angle on Tibial Angulation and Torsion During CORA-Based Leveling Osteotomy in Toy Breed Dogs: A Computer Modeling-Based Study

Abstract

The objective of this study was to determine the effect of osteotomy angle and tibial proximal segment rotation angle on angular and torsional tibial deformities and to assess the trends of these deformities during the rotation of the tibial proximal segment in a center of rotation of angulation (CORA)-based leveling osteotomy (CBLO) by performing computer modeling of the tibia. Four tibias of toy breed dogs with no history of lameness were used in this study. Osteotomies were performed in the proximal tibias at angles of 0 o , 10 o , 20 o , 10 o , and 20 o , perpendicular to either the proximodistal or craniocaudal tibial axes. The mechanical medial proximal tibial angle (mMPTA) and transcondylar (TC) and distal cranial tibial (CnT) axes were used to measure angular and torsional deformities, respectively. All tibias showed an increase in angular and rotational deformities with an increase in the tibial plateau rotation angle. The tibia with osteotomies performed in the proximodistal and craniocaudal directions showed the highest magnitude of torsional and angular deformities, respectively. The results of this study revealed a tendency of occurrence of angular and torsional deformities with osteotomy performed along the proximodistal and craniocaudal directions in the CBLO.

Evaluation of a customized 3D‐printed saw guide for tibial plateau leveling osteotomy: An ex vivo study

“…The difference between preoperative and postoperative tibial torsion angle as defined as the angle between the transcondylar (TC) axis and the distal cranial tibial (CnT) axis was measured to evaluate induced torsional deformity of the tibia. They were measured on CT. [13][14][15] All measurements were randomly performed by the primary author at 5 different time points at least 1 day apart.…”

Influence of Plate Design on the Accuracy of Tibial Alignment after Center of Rotation of Angulation-Based Leveling Osteotomy in Toy-Breed Dogs

“…One of the complications of TPLO is the tibial plateau angle (TPA) shift that increases the TPA due to implant instability and contracture of the quadriceps muscle (11). It has been reported that the type and position of plates could influence the postoperative bone alignment and, consequently, the surgical outcome and postoperative bone healing (2,4,12,21,29). Recently, pre-contoured CBLO plates have been developed to achieve greater stability of the segments during fixation (20).…”