Advanced Textile Technology ›› 2024, Vol. 32 ›› Issue (6): 52-60.

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Prediction of suture strength of high-strength suture anchors based on modified Weibull model


  1. 1. School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China; 2. Qinghai Provincial Institute for Product Quality Inspection and Testing, Xining 810000, China; 3. Department of Sports Medicine, Characteristic Medical Center of Chinese People's Armed Police Forces, Tianjin 300162, China
  • Online:2024-06-10 Published:2024-06-17



  1. 1.天津工业大学纺织科学与工程学院,天津 300387;2. 青海省产品质量检验检测院,西宁 810000;3.武警特色医学中心训练运动医学科,天津 300162

Abstract: Suture anchors play a pivotal role in securely affixing soft tissue to the skeletal framework, having emerged as indispensable tools in the realm of orthopedic surgery. The genesis of suture anchors, comprised initially of metallic screws and sutures, traces back over three decades. In the pursuit of augmenting the tensile strength of these suture anchors, a plethora of variants have been conceived, encompassing metallic suture anchors, biodegradable suture anchors, bio-stable suture anchors, bio-composite suture anchors, and all-suture anchors. The quintessential suture anchor necessitates the provision of substantial mechanical stability to ensure the resolute fixation of soft tissue upon osseous substrates. Within the realm of suture anchors, it is noteworthy that improvements in the anchoring component have mitigated suture rupture as a primary cause of surgical failure in orthopedics. Thus, augmenting suture tensile strength represents the crux of the contemporary challenge. This investigation delves into the fabrication of high-strength suture anchor sutures and scrutinizes their mechanical properties. Leveraging a braiding methodology, we have manufactured high-tensile suture anchor sutures, further prognosticating the rupture strength of suture anchor sutures via both two-parameter Weibull model and modified Weibull model, thereby mitigating risks associated with the utilization of suture anchors.
In this experimental endeavor, 8.3 tex UHMWPE fibers were adopted as the primary raw material,  and a braiding technique was employed to engender single-layer braided sutures as well as axially-reinforced double-layer braided sutures. To scrutinize their mechanical properties, we selected varying intervals of 8, 16, 24, 32, 40, and 48 mm to test the tensile strength of individual fibers, opted for 50 and 200 mm intervals for assessing the tensile strength of 8.3 tex filaments, and relied upon a 200 mm interval for gauging the tensile strength of single-layer braided sutures and axially-reinforced double-layer braided sutures. Concurrently, the diameter of fibers and the angular displacement between fibers within the sutures were subjected to meticulous measurement. Subsequently, both the two-parameter Weibull model and the modified Weibull model were employed to characterize the tensile strength of individual fibers, 8.3 tex filament, and single-layer braided sutures.
The findings unveiled that the fracture strength of single-layer braided sutures stood at 299.8 N, whereas axially-reinforced double-layer braided sutures exhibited an impressive fracture strength soaring to 393.0 N. Regrettably, when utilizing the two-parameter Weibull model to prognosticate the rupture strength of 8.3 tex filament and single-layer braided sutures, substantial disparities from actual values were noted, with all predictions falling outside the 95% confidence interval of the observed values and an accuracy rate of less than 5%. Conversely, the forecasts derived from the modified Weibull model consistently fell within the 95% confidence interval of the actual values, attesting to their superior accuracy.
This study's manufactured high-tensile suture anchor sutures evince superior tensile strength when juxtaposed with analogous medical sutures. The axially-reinforced double-layer braided sutures, in particular, attain a formidable rupture strength of 393.0 N. Whether it pertains to the prediction of the tensile strength of 8.3 tex filament or single-layer braided sutures, the modified Weibull model's prognostications surpass the accuracy of those rendered by the two-parameter Weibull model. Furthermore, by employing the modified Weibull model, it becomes possible to predict the tensile strength from individual fibers to filaments and subsequently to yarns. This achievement establishes a solid theoretical foundation for future research in medical suture structural design and mechanical performance analysis.

Key words: suture anchor sutures, UHMWPE, fracture strength, two-parameter Weibull model, modified Weibull model, strength prediction

摘要: 为消除缝合锚钉缝线在使用过程中存在断裂的风险,以8.3 tex超高分子量聚乙烯纤维为原材料,采用编织工艺制备了单层编织缝线和轴向衬纱双层编织缝线。为了研究其力学性能,选择8、16、24、32、40、48 mm隔距对单纤维的断裂强力进行测试,选择50、200 mm隔距对8.3 tex复丝的断裂强力进行测试,选择200 mm隔距对单层编织缝线和轴向衬纱双层编织缝线的断裂强力进测试。对纤维的直径和缝线中纤维与轴向夹角的角度进行测量。采用两参数Weibull模型和改进Weibull模型对单纤维、8.3 tex复丝和单层编织缝线的断裂强度进行预测。结果表明:单层编织缝线的断裂强力为299.8 N,轴向衬纱双层编织缝线的断裂强力高达393.0 N。对8.3 tex复丝和单层编织缝线的断裂强度进行预测,改进Weibull模型的预测值准确度高。高强骨锚钉缝线的强力比同类型医用缝线更高,改进Weibull模型可对高强缝合锚钉缝线的强力进行精准预测,实现了从单纤维到复丝再到纱线的断裂强度预测,可为医用缝线结构设计和力学性能分析提供理论依据。

关键词: 缝合锚钉缝线, 超高分子量聚乙烯, 断裂强力, 两参数Weibull模型, 改进Weibull模型, 强度预测

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