Mahar Andrew, Allred Darin W, Wedemeyer Michelle, Abbi Guarav, Pedowitz Robert
Orthopedic Biomechanics Research Center, Children's Hospital, San Diego, California, USA.
Arthroscopy. 2006 Feb;22(2):130-5. doi: 10.1016/j.arthro.2005.08.042.
To compare the fixation strength and radiographic motion of an anchor designed for intracortical (IC) fixation (FT Anchor, Arthrex, Naples, FL) with that of standard anchors used for rotator cuff repair.
In vitro human cadaveric biomechanical study.
Four types of metallic suture anchors (8 per group) were randomly inserted into human cadaveric humeri using an IC anchor and 3 types of standard anchors. Anchors were inserted 45 degrees to the humeral head surface and 90 degrees to the rotator cuff line of action. Anchors were tested under physiologic loads for 500 cycles followed by a failure test. The number of cycles, failure mode, and failure load were recorded. Fluoroscopy was used to measure rotation and displacement of the anchor within the humeral head during testing. Data were analyzed using a 1-way analysis of variance with a correction for multiple comparisons.
There were no significant differences in anchor displacement or rotation measured by fluoroscopy after cyclic loading. Total construct displacement across anchors ranged from 4.9 to 7.8 mm, well beyond the 3-mm failure criterion reported in the literature. The IC anchor had a statistically significant greater failure load than the other devices. There was no significant difference in failure load between the other 3 anchors. The anchor had the greatest number of cycles to 3 mm of failure. This was not significantly different than the TwinFix anchor (Smith & Nephew, Andover, MA), but both values were significantly greater than both the Super Revo (Linvatec, Largo, FL) and Fastin RC (DePuy Mitek, Raynham, MA) anchors.
Anchor motion accounted for about one third of total displacement of the suture/anchor construct. IC fixation anchors performed well compared with standard anchors in human cadaveric bone.
Fluoroscopic imaging showed both rotation and displacement of the anchor within the humeral head which may contribute to early gap formation after rotator cuff repairs.
比较一种设计用于皮质内（IC）固定的锚钉（FT锚钉，Arthrex公司，那不勒斯，佛罗里达州）与用于肩袖修复的标准锚钉的固定强度和影像学运动情况。
体外人体尸体生物力学研究。
使用一种IC锚钉和3种标准锚钉，将四种类型的金属缝线锚钉（每组8个）随机插入人体尸体肱骨中。锚钉以与肱骨头表面呈45度且与肩袖作用线呈90度的角度插入。在生理负荷下对锚钉进行500次循环测试，随后进行失效测试。记录循环次数、失效模式和失效负荷。在测试过程中使用荧光透视法测量锚钉在肱骨头内的旋转和位移。使用单向方差分析并进行多重比较校正来分析数据。
循环加载后，通过荧光透视法测量的锚钉位移或旋转没有显著差异。所有锚钉的总结构位移范围为4.9至7.8毫米，远超过文献报道的3毫米失效标准。IC锚钉的失效负荷在统计学上显著高于其他装置。其他3种锚钉之间的失效负荷没有显著差异。该锚钉达到3毫米失效的循环次数最多。这与TwinFix锚钉（史赛克公司，安多弗，马萨诸塞州）没有显著差异，但这两个值均显著高于Super Revo锚钉（林瓦特克公司，拉戈，佛罗里达州）和Fastin RC锚钉（迪普伊米泰克公司，雷纳姆，马萨诸塞州）。
锚钉运动约占缝线/锚钉结构总位移的三分之一。在人体尸体骨中，IC固定锚钉与标准锚钉相比表现良好。
荧光透视成像显示锚钉在肱骨头内有旋转和位移，这可能导致肩袖修复后早期间隙形成。
