Section of Veterinary Clinical Sciences, University College Dublin, Belfield, Dublin 4, Ireland.
Small Animal Clinic, St George's University, Grenada, West Indies.
Vet Surg. 2020 Dec;49(8):1527-1535. doi: 10.1111/vsu.13526. Epub 2020 Oct 4.
To determine the effect of stifle flexion on the proximity of the cranial tibial artery to the proximal tibia in canine stifles with an intact or transected cranial cruciate ligament (CCL).
Ex vivo randomized blinded computed tomographic angiographic study.
Fifteen pelvic limbs from eight greyhound cadavers.
The femoral artery and vein were cannulated and injected with 10 mL of iohexol. Each limb was placed in lateral recumbency on an acrylic sheet with predrawn femoral and tibial lines representing angles of stifle extension. Computed tomography was performed before (limbs 1-15) and after (limbs 10-15) CCL transection. The shortest distance between the cranial tibial artery and proximal tibia (dCrTA-PT) was measured at a distance of one patellar length from medial intercondylar tubercle.
Median dCrTA-PT in intact specimens at 70°, 90°, 110°, and 135° was 2.04, 2.05, 2.28, and 2.51 mm, respectively (P = .008). Pairwise comparisons identified a difference between 70° and 135° (P = .007). Mean dCrTA-PT in transected specimens at 70°, 90°, 110°, and 135° was 2.60, 2.57, 2.90, and 2.79 mm, respectively (P = .208). Median overall dCrTA-PT was 2.24 mm in intact specimens (limbs 1-15, all four angles of extension combined) and 2.76 mm in transected specimens (limbs 10-15, all angles combined; P = .01).
Flexion of the stifle resulted in a negligible decrease in dCrTA-PT in intact specimens but had no effect in CCL transected stifles.
The angle of stifle extension does not appear to have any clinically significant effect on the proximity of cranial tibial artery to the proximal tibia.
确定在未切断或切断前十字韧带（CCL）的犬后膝关节中，膝关节屈曲对胫骨近端的颅内侧动脉接近程度的影响。
离体随机盲法计算机断层血管造影研究。
8 只灰狗尸体的 15 条骨盆肢体。
股动静脉插管，注入 10 毫升碘海醇。每条肢体均置于丙烯酸片上的侧卧位，片上预先绘制了代表膝关节伸展角度的股骨和胫骨线。在 CCL 切断之前（肢体 1-15）和之后（肢体 10-15）进行计算机断层扫描。在距内侧髁间嵴 1 个髌骨长度处测量颅内侧动脉与胫骨近端（dCrTA-PT）的最短距离。
完整标本在 70°、90°、110°和 135°时的中位数 dCrTA-PT 分别为 2.04、2.05、2.28 和 2.51mm（P =.008）。两两比较发现 70°和 135°之间存在差异（P =.007）。切断标本在 70°、90°、110°和 135°时的平均 dCrTA-PT 分别为 2.60、2.57、2.90 和 2.79mm（P =.208）。完整标本（肢体 1-15，所有四个伸展角度）的中位数整体 dCrTA-PT 为 2.24mm，切断标本（肢体 10-15，所有角度）为 2.76mm（P =.01）。
膝关节的屈曲使完整标本的 dCrTA-PT 几乎没有减少，但在切断 CCL 的膝关节中没有影响。
膝关节伸展的角度似乎对颅内侧动脉接近胫骨近端没有任何临床意义。
