Schrøder H A, Weeth R E, Madsen T
Arch Orthop Trauma Surg (1978). 1985;104(4):197-200. doi: 10.1007/BF00450209.
The mechanical properties of four different configurations of the Hoffmann external fixation system were tested in an experimental setup using 4-mm stainless steel pins. Furthermore, stainless-steel pins and titanium pins 5 mm in diameter were applied in one of the fixators. The evaluation of the results was based on a paired t-test, with P less than 0.05 as the significance level. The quadrilateral transfixing Hoffmann-Vidal frame (HVF) proved to be the most rigid fixator under all loading conditions. The unilateral frame type supplied with two connecting bars and four ball joints was significantly more rigid than the unilateral single-bar device. By increasing the pin diameter from 4 to 5 mm a further increase of stiffness could be achieved, thus reaching about two-thirds of the rigidity of the HVF. The difference between titanium and stainless steel pins was not significant. Common for all the frame mountings was a fivefold greater rigidity in the lateral direction (in the plane of the pins) than in the anteroposterior direction (perpendicular to the pins).
在一个实验装置中，使用4毫米不锈钢针测试了霍夫曼外固定系统四种不同构型的力学性能。此外，在其中一种固定器中应用了直径5毫米的不锈钢针和钛针。结果评估基于配对t检验，以P小于0.05作为显著性水平。四边形穿针霍夫曼 - 维达尔框架（HVF）在所有加载条件下被证明是最坚固的固定器。配备两根连接杆和四个球窝关节的单侧框架类型比单侧单杆装置明显更坚固。通过将针的直径从4毫米增加到5毫米，可以进一步提高刚度，从而达到HVF刚度的约三分之二。钛针和不锈钢针之间的差异不显著。所有框架安装的共同特点是横向（在针的平面内）刚度比前后方向（垂直于针）大五倍。
