Effect of augmentation techniques on the failure of pedicle screws under cranio-caudal cyclic loading

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• 作者：Richard Bostelmann ; Alexander Keiler ; Hans Jakob Steiger…
• 关键词：Biomechanical investigation ; Load measurement ; Cyclic loading ; Spine ; Spinal fusion ; Cement augmentation ; Osteoporosis ; Cannulated screws ; Revision surgery ; Cadaver study ; Osteoporotic fractures
• 刊名：European Spine Journal
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：26
• 期：1
• 页码：181-188
• 全文大小：
• 刊物类别：Medicine
• 刊物主题：Surgical Orthopedics; Neurosurgery;
• 出版者：Springer Berlin Heidelberg
• ISSN：1432-0932
• 卷排序：26

文摘

PurposeAugmentation of pedicle screws is recommended in selected indications (for instance: osteoporosis). Generally, there are two techniques for pedicle screw augmentation: inserting the screw in the non cured cement and in situ-augmentation with cannulated fenestrated screws, which can be applied percutaneously. Most of the published studies used an axial pull out test for evaluation of the pedicle screw anchorage. However, the loading and the failure mode of pullout tests do not simulate the cranio-caudal in vivo loading and failure mechanism of pedicle screws. The purpose of the present study was to assess the fixation effects of different augmentation techniques (including percutaneous cement application) and to investigate pedicle screw loosening under physiological cyclic cranio-caudal loading.