Biodegradable interference screw fixation exhibits pull-out force and stiffness similar to titanium screws
Biodegradable interference screw fixation exhibits pull-out force and stiffness similar to titanium screws
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DOI：
10.1177/03635465980260010401
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发表时间：
1998-01-01
影响因子：
4.8
通讯作者：
Hoffmann, RFG
中科院分区：
文献类型：
--
作者：
Weiler, A;Windhagen, HJ;Hoffmann, RFG
最近，对用于骨-肌腱-骨移植物固定的生物可降解界面螺钉的兴趣增加，导致许多螺钉变得可用。植入物由不同的聚合物制成，具有不同的设计，这可能会影响其机械性能。几项研究报告了使用不同生物力学模型的这些螺钉的各种力学结果，本研究的目的是在标准化模型中比较六种不同可生物降解界面螺钉（由五种不同聚合物组成）与传统钛螺钉的可靠生物力学数据，使用70个近端小腿胫骨来确定最大拔出力、固定刚度，同时测定了螺钉的最大失效扭矩，并对螺钉设计的驱动力和螺纹形状等方面进行了分析。6枚可生物降解螺钉中有5枚提供了与传统钛螺钉相当的初始拔出力和固定刚度。通过使驱动器设计适应聚合物原材料的机械性能，可以大大增加失效扭矩。拔出力和螺纹高度之间的相关性表明，即使在可生物降解植入物中，固定刚度也取决于螺钉设计。
Recently, increased interest in biodegradable interference screws for bone-tendon-bone graft fixation has led to numerous screws becoming available. The implants are made from different polymers and have different designs, which might influence their mechanical properties. Several studies have reported a wide range of mechanical results for these screws using different biomechanical models, The aim of the present study is to compare reliable biomechanical data for six different biodegradable interference screws, consisting of five different polymers, with a conventional titanium screw in a standardized model, Seventy proximal calf tibias were used to determine maximal pull-out force, stiffness of fixation, and insertion torque for interference screw fixation of bone-tendon-bone grafts, Additionally, maximal torque at failure was determined, Data were analyzed with respect to aspects of screw design, such as drive and thread shape. Five of the six biodegradable screws provided initial pull-out force and stiffness of fixation comparable with that of a conventional titanium screw, Torque at failure can be greatly increased by adapting the drive design to the mechanical properties of the polymeric raw material, A correlation between pull-out force and thread height indicates that fixation rigidity depends on screw design, even in a biodegradable implant.