Little is known about the direct influence of different technical options at the rotator cuff tendon-bone interface (TBI) and, more specifically, at the medial bearing row (MBR), regarding local contact force, area and pressure. We evaluated the mechanical repercussions of different medial row anchor configurations for that setting using different values of tension in the lateral row anchors. Knotless transosseous equivalent (TOE) rotator cuff repairs with locked versus nonlocked medial anchors and single versus double-hole suture passage were tested in a synthetic rotator cuff mechanical model, using 2 different values of lateral row tension. Contact force, area, pressure, peak force and MBR force were compared at the simulated TBI using a pressure mapping sensor. When compared to locked anchors, medial row sliding configurations generate lower values for all the above-mentioned parameters. The use of double-hole suture passage in the medial cuff generated slightly higher values contact area regardless of lateral row tension. At higher lateral row tension values, lower values of the remaining parameters, including MBR force, were found when compared to single-hole suture passage. Lateral row anchor tension increase induced an increase of all parameters regardless of the medial row configuration and TBI contact force and MBR force were the most susceptible parameters, regardless of the medial row pattern. Medial row mechanism, suture configuration and lateral row tension interfere with the mechanical force, area and pressure at by TBI. Lateral row tension increase is a major influencer in those parameters. These results can help surgeons choose the right technique considering its mechanical effect at the TBI.

中文翻译：

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模拟肩袖修复中不同内侧排无结结构和外侧排张力的肌腱-骨界面机械后果

关于肩袖肌腱-骨界面（TBI），更具体地说，内侧轴承排（MBR）的不同技术选项对局部接触力、面积和压力的直接影响知之甚少。我们使用外侧排锚的不同张力值评估了不同内侧排锚配置对该设置的机械影响。在合成肩袖机械模型中，使用 2 种不同的侧排张力值测试了无结经骨等效 (TOE) 肩袖修复与锁定与非锁定内侧锚和单孔与双孔缝合通道。使用压力映射传感器在模拟 TBI 处比较接触力、面积、压力、峰值力和 MBR 力。与锁定的锚相比，中间行滑动配置为所有上述参数生成较低的值。在内侧袖带中使用双孔缝合通道产生略高的接触面积值，而与外侧排张力无关。与单孔缝合通道相比，在较高的横向行张力值下，其余参数（包括 MBR 力）的值较低。无论内侧排配置如何，外侧排锚张力增加都会导致所有参数的增加，而无论内侧排模式如何，TBI 接触力和 MBR 力都是最敏感的参数。内侧排机制、缝合结构和外侧排张力会干扰 TBI 处的机械力、面积和压力。横向行张力增加是这些参数的主要影响因素。