科研之友
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摘要
Introduction: The purpose of this study was to compare the pullout strength of anchors inserted at 90 and 45 degrees to the bone surface using synthetic bones and porcine humeri. Subjects and methods: Pullout tests were performed by universal testing machine. Synthetic cancellous bones of 0.08, 0.16, and 0.24 g/cm(3) (defining as low, medium and high density, respectively) with 2-mm thick cortical bone model attached on one side and the greater tuberosity of porcine humeri (average bone density, 270 mg/cm(3)) were chosen for pullout tests. Metallic anchors were inserted at 90 or 45 to the surface and pulled at 90 or 45 from the surface. The maximum load to failure for each condition was recorded. Differences in pullout failure loads between insertion angle, pulling angle, and bone density were analyzed. Results: When the sutures were pulled at 90 degrees in low, medium, high density bones, and porcine humeri, 90 degrees-inserted-anchors showed higher pullout strength than the 45 degrees-inserted-anchors (534.6 +/- 28.9 N vs. 488.1 +/- 25.3 N (p < 0.05), 636.8 +/- 25.3 N vs. 517.5 +/- 27.4 N (p < 0.01), 735.6 +/- 45.1 N vs. 557.0 +/- 42.5 N (p < 0.01), and 285.6 +/- 47.2 N vs. 181.4 +/- 31.3 N (p < 0.01), respectively). When the sutures were pulled at 45 degrees in low, medium density bones and porcine humeri, 90 degrees-inserted-anchors showed higher pullout strength than the 45 degrees-inserted-anchors (651.1 +/- 38.3 N vs. 529.4 +/- 37.6 N (p < 0.01), 711.4 +/- 25.3 N vs. 599.2 +/- 29.8 N (p < 0.01), and 265.3 +/- 49.0 N vs. 181.5 +/- 29.4 N (p < 0.01), respectively). Conclusion: Pullout strength of the anchors inserted at 90 degrees to the bone surface was greater than the anchors inserted at 45 regardless of the bone density.
- 出版日期2017-1
