Buirkle Corinne L, Aulakh Karanvir S, Gines J Alberto, Rademacher Nathalie, Liu Chin-Chi, Barnes Katherine
Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, Louisiana.
Department of Small Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, Texas.
Vet Surg. 2019 Apr;48(3):408-416. doi: 10.1111/vsu.13172. Epub 2019 Jan 31.
To determine the effect of tibial rotation on radiographic tibial plateau angle (TPA) measurement in normal and cranial cruciate ligament (CrCL)-deficient stifles.
Cadaveric study.
Five pairs of canine cadaver hind limbs with no stifle osteoarthritis.
Mediolateral radiographs of each specimen were obtained at 0°, 10°, 20°, and 30° of internal and external rotation of the tibia with both intact and transected CrCL. Two Kirschner wires were placed at the cranial and caudal landmarks of the tibial plateau, and the 0° views were imaged again, representing the anatomic TPA. Five observers measured the TPA twice on all images. Measurements were compared by using a mixed-model ANOVA. Intraobserver and interobserver variability were evaluated by using the coefficient of variation.
Tibial plateau angle did not differ among the anatomic, CrCL-intact, and CrCL-deficient 0° views or between the CrCL-intact and CrCL-deficient views at the various tibial rotations. The only difference detected was between CrCL-intact stifles radiographed at 0° and external rotation (range, 1.16°-1.6°; P = .016, P = .001, and P < .001). Tibial rotation, CrCL transection, and their interaction all failed to influence intraobserver and interobserver variability (P > .05).
In CrCL-deficient stifles, tibial rotation of up to 30° internally and externally did not result in clinically relevant changes in TPA measurements.
The TPA can be successfully measured with up to 30° of internal and external tibial rotation in CrCL-deficient stifles with no osteoarthritic changes.
确定胫骨旋转对正常和颅侧十字韧带（CrCL）损伤的 stifle 关节放射学胫骨平台角（TPA）测量的影响。
尸体研究。
五对无 stifle 关节骨关节炎的犬类尸体后肢。
在胫骨内旋和外旋0°、10°、20°和30°时，对每个标本进行内外侧X线摄影，CrCL完整和横断时均进行。在胫骨平台的颅侧和尾侧标志处放置两根克氏针，并再次拍摄0°视图，代表解剖学TPA。五名观察者对所有图像进行两次TPA测量。使用混合模型方差分析比较测量结果。通过变异系数评估观察者内和观察者间的变异性。
解剖学、CrCL完整和CrCL损伤的0°视图之间，以及不同胫骨旋转角度下CrCL完整和CrCL损伤视图之间的胫骨平台角无差异。唯一检测到的差异是在0°和外旋时拍摄的CrCL完整的 stifle 关节之间（范围为1.16° - 1.6°；P = 0.016，P = 0.001，P < 0.001）。胫骨旋转、CrCL横断及其相互作用均未影响观察者内和观察者间的变异性（P > 0.05）。
在CrCL损伤的 stifle 关节中，胫骨内外旋转达30°不会导致TPA测量出现临床相关变化。
在无骨关节炎改变的CrCL损伤的 stifle 关节中，胫骨内外旋转达30°时可成功测量TPA。
