Kafchitsas K, Geiger F, Rauschmann M, Schmidt S
Klinik für Orthopädie und Orthopädische Chirurgie, Universitätsmedizin Mainz, Langenbeckstrasse 1, 55129, Mainz, Deutschland.
Orthopade. 2010 Jul;39(7):679-86. doi: 10.1007/s00132-010-1603-7.
The effects of deteriorated bone density become particularly apparent in cases where spinal instrumentation is needed. Cement augmentation of pedicle screws for better bone purchase became the subject of many studies, which proved the biomechanical superiority and the increased pullout strength of cement augmented screws. Inadequate, and sometimes dangerous, cement distribution made the need for development of special implants inevitable. Pedicle screws with side openings and a central drill hole allow cement augmentation through the implant and increase not only the screw diameter but also the interfacial strength between the three components (screw-cement-bone). Accordingly cement distribution can be affected by the selection of the side openings (size and position). Screws with conical core and distally situated side openings facilitate the development of uniform cement dough.
在需要脊柱内固定的情况下，骨密度下降的影响尤为明显。为了更好地固定骨组织，对椎弓根螺钉进行骨水泥强化成为众多研究的主题，这些研究证明了骨水泥强化螺钉在生物力学方面的优越性以及拔出强度的提高。骨水泥分布不足，有时甚至很危险，使得开发特殊植入物成为必然。带有侧孔和中心钻孔的椎弓根螺钉允许通过植入物进行骨水泥强化，不仅增加了螺钉直径，还增加了三个组件（螺钉 - 骨水泥 - 骨）之间的界面强度。因此，骨水泥分布会受到侧孔选择（尺寸和位置）的影响。具有锥形芯和位于远端的侧孔的螺钉有助于形成均匀的骨水泥团。
