Background:The approach to managing the footprint area and reconstructing the tendon-bone interface (TBI) is critical for optimal healing.Purpose:To evaluate the outcomes of the semi–bone tunnel (SBT) technique using a double-row suture bridge combined with platelet-rich plasma (PRP) hydrogel for rotator cuff repair in a rabbit model.Study Design:Controlled laboratory study.Methods:A total of 48 New Zealand White rabbits were divided into 4 groups. The supraspinatus tendons were severed at the footprint to create a rotator cuff tear model in the surgical groups. Rabbits were treated with the traditional onto-surface repair (control group), SBT technique (SBT group), and SBT technique combined with PRP hydrogel implantation (SBT+PRP group). The rabbits without surgery were the normal group. At 8 weeks after surgery, macroscopic observation, magnetic resonance imaging (MRI) and micro–computed tomography (μCT) examinations, histological evaluations, and biomechanical tests were performed to assess the curative effects of the given treatments.Results:The MRI results showed that the repaired supraspinatus tendon presented a uniform signal, minimal inflammatory response, and the lowest signal-to-noise quotient value in the SBT+PRP group. The μCT results suggested that the SBT technique did not reduce the local bone mineral density in the TBI area compared with the onto-surface repair technique. The histological staining results showed that the regenerated TBI in the SBT+PRP group had a 4-layer structure similar to the natural tissue. The highest values for biomechanical properties were observed in the SBT+PRP group, and there was no significant difference between the SBT+PRP group and normal group.Conclusion:The SBT technique presented a better tendon-bone healing effect for rotator cuff tear in the rabbit model compared with the traditional onto-surface repair technique. The specimens in the SBT+PRP group had a similar TBI structure and biomechanical properties to the natural tissue.Clinical Relevance:The SBT technique can be an alternative surgical approach for rotator cuff repair, especially for moderate to large tears and cases requiring scaffold implantation.

中文翻译：

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使用双排缝合桥结合富血小板血浆水凝胶的半骨隧道技术修复兔模型肩袖

背景：管理足迹区域和重建肌腱-骨界面（TBI）的方法对于最佳愈合至关重要。目的：评估使用双排缝合桥结合半骨隧道（SBT）技术的结果富血小板血浆（PRP）水凝胶用于兔模型肩袖修复。研究设计：对照实验室研究。方法：总共48只新西兰白兔分为4组。在手术组中，在足印处切断冈上肌腱，以创建肩袖撕裂模型。分别采用传统表面修复术（对照组）、SBT技术（SBT组）、SBT技术联合PRP水凝胶植入术（SBT+PRP组）进行治疗。未手术的兔为正常组。术后8周，通过宏观观察、磁共振成像（MRI）和显微计算机断层扫描（μCT）检查、组织学评估和生物力学测试来评估治疗效果。 结果：MRI结果显示： SBT+PRP 组中修复后的冈上肌腱呈现出均匀的信号、最小的炎症反应和最低的信噪商值。 μCT结果表明，与表面修复技术相比，SBT技术并未降低TBI区域的局部骨矿物质密度。组织学染色结果显示，SBT+PRP组再生的TBI具有与自然组织相似的4层结构。 SBT+PRP组生物力学性能最高，SBT+PRP组与正常组无显着差异。结论：SBT技术对肩袖撕裂的肌腱骨愈合效果较好。兔子模型与传统表面修复技术的比较。 SBT+PRP组的标本与自然组织具有相似的TBI结构和生物力学特性。 临床意义：SBT技术可以作为肩袖修复的替代手术方法，特别是对于中度至大度撕裂和需要支架植入的病例。