Shea Thomas M, Laun Jake, Gonzalez-Blohm Sabrina A, Doulgeris James J, Lee William E, Aghayev Kamran, Vrionis Frank D
H. Lee Moffitt Cancer Center & Research Institute, Neuro-Oncology Department, Tampa, FL 33612, USA ; Department of Chemical & Biomedical Engineering, University of South Florida, Tampa, FL 33620, USA.
Morsani College of Medicine, University of South Florida, Tampa, FL 33612, USA.
Biomed Res Int. 2014;2014:748393. doi: 10.1155/2014/748393. Epub 2014 Mar 3.
Osteoporosis is a medical condition affecting men and women of different age groups and populations. The compromised bone quality caused by this disease represents an important challenge when a surgical procedure (e.g., spinal fusion) is needed after failure of conservative treatments. Different pedicle screw designs and instrumentation techniques have been explored to enhance spinal device fixation in bone of compromised quality. These include alterations of screw thread design, optimization of pilot hole size for non-self-tapping screws, modification of the implant's trajectory, and bone cement augmentation. While the true benefits and limitations of any procedure may not be realized until they are observed in a clinical setting, axial pullout tests, due in large part to their reproducibility and ease of execution, are commonly used to estimate the device's effectiveness by quantifying the change in force required to remove the screw from the body. The objective of this investigation is to provide an overview of the different pedicle screw designs and the associated surgical techniques either currently utilized or proposed to improve pullout strength in osteoporotic patients. Mechanical comparisons as well as potential advantages and disadvantages of each consideration are provided herein.
骨质疏松症是一种影响不同年龄组和人群中男性和女性的病症。当保守治疗失败后需要进行外科手术(例如脊柱融合术)时,这种疾病导致的骨质受损是一个重大挑战。人们已经探索了不同的椎弓根螺钉设计和器械技术,以增强在骨质受损的骨骼中脊柱器械的固定。这些措施包括改变螺纹设计、优化非自攻螺钉的导向孔尺寸、改变植入物的轨迹以及骨水泥强化。虽然任何手术的真正益处和局限性在临床环境中观察到之前可能无法实现,但轴向拔出试验由于在很大程度上具有可重复性且易于实施,通常用于通过量化将螺钉从体内拔出所需力的变化来评估器械的有效性。本研究的目的是概述目前使用的或为提高骨质疏松症患者的拔出强度而提出的不同椎弓根螺钉设计及相关手术技术。本文还提供了力学比较以及每种考量的潜在优缺点。