Department of Orthopaedic Surgery, University of Washington, Harborview Medical Center, 325 Ninth Avenue, Seattle, WA 98104, United States.
Injury. 2010 Jul;41(7):753-7. doi: 10.1016/j.injury.2010.03.003.
In developing countries, tibial shaft fractures are frequently stabilised using Surgical Implant Generation Network (SIGN) nails. Despite widespread use throughout the world, little is known regarding their biomechanical properties. This study aimed to compare the mechanical stiffness of the SIGN tibial nail with a standard hollow tibial nail.
A fracture gap model was created to simulate a comminuted mid-shaft tibia fracture (AO/OTA42-C3) using synthetic composite bones. The constructs were stabilised with either a 9 mm solid SIGN nail or a 10 mm hollow Russell-Taylor nail. Both nail systems were interlocked proximally and distally. Following fixation, the specimens were loaded in axial, torsional, and cyclical axial modes to calculate construct stiffness and irreversible (plastic) deformation.
The mean axial stiffness for the SIGN nail constructs was 47% higher than mean stiffness for the RT nail constructs (p<0.001). The difference in torsional stiffness was not statistically significant. However, the SIGN group demonstrated 159% more irreversible deformation than the Russell-Taylor group (p=0.006) for the loading parameters studied.
The SIGN tibial nail, despite its slightly smaller diameter, can provide similar construct stiffness and stability, when compared to a larger hollow nail for stabilisation of tibial shaft fractures.
在发展中国家，胫骨骨干骨折常采用外科植入物网络（SIGN）钉固定。尽管这种钉子在全球范围内广泛使用，但关于其生物力学特性的了解甚少。本研究旨在比较 SIGN 胫骨钉和标准空心胫骨钉的力学刚度。
使用合成复合材料骨创建骨折间隙模型，模拟粉碎性中段胫骨骨折（AO/OTA42-C3）。使用 9 毫米实心 SIGN 钉或 10 毫米空心 Russell-Taylor 钉固定两种构建体。两种钉系统均在近端和远端进行互锁。固定后，标本在轴向、扭转和循环轴向模式下加载，以计算结构刚度和不可逆转（塑性）变形。
SIGN 钉构建体的平均轴向刚度比 RT 钉构建体高 47%（p<0.001）。扭转刚度的差异无统计学意义。然而，对于研究的加载参数，SIGN 组的不可逆转变形比 Russell-Taylor 组多 159%（p=0.006）。
与用于固定胫骨骨干骨折的较大空心钉相比，SIGN 胫骨钉的直径虽略小，但可提供相似的结构刚度和稳定性。
