Koret School of Veterinary Medicine, Robert H Smith Faculty of Agriculture Food & Environment, Hebrew University of Jerusalem, Jerusalem, Israel.
CYVETS Veterinary Center, Paphos, Cyprus.
Vet Comp Orthop Traumatol. 2023 Nov;36(6):324-330. doi: 10.1055/s-0043-1771191. Epub 2023 Jul 24.
The aim of this study was to develop a three-dimensional (3D) model to identify the isometric component of the cranial cruciate ligament (CCL) in dogs.
A static 3D model of the specimen was generated from a computed tomography scan of the stifle of a dog and a kinematic model was generated from data collected, every 5 degrees from full extension (131 degrees) through 80 degrees of stifle flexion, from four sensors attached to the tibia. Kinematic data were superimposed on the static model by aligning the points of interest, which were defined for both models. This allowed the tibia to rotate and translate relative to the femur based on the kinematic data. The contours of the distal femur and proximal tibia were converted into point clouds and the distance between each point in the femoral point cloud and all the points in the tibial point cloud were measured at each of the 15 positions. The difference between the maximum and minimum distances for each pair of points was calculated, and when it was less than 0.2 mm, points were illustrated as two red dots connected by a line at their locations on the femur and tibia.
A total of 3,681 pairs of isometric points were identified and were located at the origin and insertion of the CCL and on the lateral aspect of the stifle.
Isometric areas are present at the origin and insertion of the CCL and lateral aspect of the stifle. Better understanding of these locations may lead to refinements in techniques to replace the ruptured CCL.
本研究旨在建立一个三维（3D）模型，以识别犬十字韧带（CCL）的等距成分。
从犬的膝关节计算机断层扫描生成标本的静态 3D 模型，并从连接到胫骨的四个传感器收集的数据生成运动学模型，每个传感器从完全伸展（131 度）到 80 度膝关节屈曲每隔 5 度收集。运动学数据通过对齐两个模型中定义的兴趣点来叠加在静态模型上。这允许胫骨根据运动学数据相对于股骨旋转和平移。远端股骨和近端胫骨的轮廓被转换为点云，并且在每个 15 个位置处测量股骨点云的每个点与胫骨点云的所有点之间的距离。计算每对点之间的最大和最小距离之间的差异，当差异小于 0.2mm 时，在股骨和胫骨上的位置用连接两个红点的线表示这些点。
总共确定了 3681 对等距点，位于 CCL 的起点和止点以及膝关节的外侧。
CCL 的起点和止点以及膝关节的外侧存在等距区域。更好地了解这些位置可能会导致改进用于替代断裂的 CCL 的技术。
