Pena F, Grøntvedt T, Brown G A, Aune A K, Engebretsen L
Department of Orthopaedic Surgery, University of Minnesota, Minneapolis 55455, USA.
Am J Sports Med. 1996 May-Jun;24(3):329-34. doi: 10.1177/036354659602400314.
Because of the good initial fixation strength of interference screws used in anterior cruciate ligament reconstruction, metal interference screws have become the standard method for fixation of bone-patellar tendon-bone grafts. To avoid some of the complications with metal screws, a bioabsorbable interference screw was developed. Data on fixation strength in older human cadavers indicate a similar failure strength between bioabsorbable and metal screws. We studied the failure mechanisms, insertion torques, and fixation strengths of absorbable and metal interference screws in cadaveric knees from young and middle-aged donors. With identical gap and screw size, the mean insertion torque for the metal screws (mean, 1.5 N-m; SD, 0.8) was significantly higher than for the absorbable screws (mean, 0.3 N-m; SD, 0.19). The mean failure load for the metal screws (mean 640 N; SD, 201) was also significantly higher than for the absorbable screws (mean, 418 N; SD, 118).
由于前交叉韧带重建中使用的干涉螺钉具有良好的初始固定强度，金属干涉螺钉已成为固定骨-髌腱-骨移植物的标准方法。为避免金属螺钉的一些并发症，研发了一种生物可吸收干涉螺钉。关于老年人体尸体固定强度的数据表明，生物可吸收螺钉和金属螺钉之间的失效强度相似。我们研究了来自年轻和中年供体的尸体膝关节中可吸收和金属干涉螺钉的失效机制、插入扭矩和固定强度。在间隙和螺钉尺寸相同的情况下，金属螺钉的平均插入扭矩（平均值为1.5 N·m；标准差为0.8）显著高于可吸收螺钉（平均值为0.3 N·m；标准差为0.19）。金属螺钉的平均失效载荷（平均值为640 N；标准差为201）也显著高于可吸收螺钉（平均值为418 N；标准差为118）。
