The Ohio State University, Columbus, OH.
Capital Animal Hospital Veterinary Surgical Center, Columbia, SC.
Am J Vet Res. 2022 May 21;83(7):ajvr.21.05.0065. doi: 10.2460/ajvr.21.05.0065.
To compare biomechanical strength of 4.75- and 5.5-mm suture anchors when pulled at 45° or 90° angles using 1 versus 2 strands of suture.
48 synthetic bone block samples.
Anchors were inserted into synthetic bone blocks and tested for pullout in 4 configurations (1 suture strand vs 2 strands and 45° vs 90° insertion angle) for a total of 8 groups with 6 samples each. A 3-way ANOVA was used to compare effect of anchor size, strand amount, and angle of pull.
All constructs failed via anchor pullout. Anchor configurations with 2 strands of suture and 4.75-mm anchor (mean, 286 ± 24 N) or 5.5-mm anchor (mean, 300 ± 15 N) had greater pullout strength than configurations with only 1 strand of suture and 4.75-mm anchor (mean, 202 ± 12 N) or 5.5-mm anchor (mean, 286 ± 13.6 N). The 5.5-mm anchors had a higher maximum load to failure under axial pull at 45° (mean, 300 ± 15 N) and 90° (mean, 295 ± 24 N), compared with 4.75-mm anchors at 45° (mean, 202 ± 12 N) and 90° (mean, 208 ± 15 N). There was a higher maximum load to failure for the double-stranded constructs, regardless of anchor size, at both angles of insertion. Anchors inserted at 45° had a higher maximum load to failure than those inserted at 90°. Constructs with 2 strands of suture had a greater pullout strength regardless of the direction of pull.
The strength of the anchor construct is likely increased with the use of double-loaded anchors inserted at 45°. Clinicians should consider using 2 strands in clinical cases.
比较在 45°或 90°角以 1 或 2 根缝线拉动时，4.75 和 5.5mm 缝线锚钉的生物力学强度。
48 个合成骨块样本。
将锚钉插入合成骨块中，并在 4 种配置（1 根缝线与 2 根缝线和 45°与 90°插入角度）下进行拔出测试，共 8 组，每组 6 个样本。采用三因素方差分析比较锚钉大小、缝线数量和拔出角度的影响。
所有结构均因锚钉拔出而失效。与仅使用 1 根缝线和 4.75mm 锚钉（平均 202±12N）或 5.5mm 锚钉（平均 286±13.6N）的配置相比，使用 2 根缝线和 4.75mm 锚钉（平均 286±24N）或 5.5mm 锚钉（平均 300±15N）的锚钉配置具有更大的拔出强度。在 45°和 90°轴向拉力下，5.5mm 锚钉的最大失效负荷更高（分别为 300±15N 和 295±24N），而 4.75mm 锚钉在 45°和 90°时（分别为 202±12N 和 208±15N）则较低。无论锚钉大小如何，双股缝线构建体在两个插入角度的最大失效负荷都更高。以 45°插入的锚钉的最大失效负荷高于以 90°插入的锚钉。无论拉力方向如何，使用双股缝线的构建体都具有更大的拔出强度。
使用 45°角插入的双负载锚钉，锚钉结构的强度可能会增加。临床医生在临床情况下应考虑使用 2 根缝线。
