Publisher DOI: 10.1007/s10039-017-0262-x
Title: Vertebral body fractures and osteopenia: augmentation or lengthening?
Language: English
Authors: Weiser, Lukas 
Viezens, Lennart 
Huber, Gerd 
Lehmann, Wolfgang 
Keywords: Cement augmentation;Continuous load;Fatigue test;Osteoporosis;Pedicle screws
Issue Date: 1-Jun-2017
Source: Trauma und Berufskrankheit 2 (19): 80-85 (2017-06-01)
Journal or Series Name: Trauma und Berufskrankheit 
Abstract (english): Background: Vertebral fractures are the most common manifestation of osteoporosis. If an interventional therapy is needed besides kyphoplasty, stabilisation with pedicle screws is commonly accepted. Loosening of pedicle screws is one of the major complications in posterior spinal stabilisation, especially in the osteoporotic spine. Augmentation of pedicle screws with cement or lengthening of the instrumentation are widely used to improve stability in these patients. Materials and methods: A biomechanical test was performed. Twelve osteoporotic human spines (Th11–L3) were randomised by bone mineral density into two groups. A short instrumentation was compared to an extended instrumentation using a fatigue testing setup with a cranial–caudal sinusoidal, cyclic (1.0 Hz) load with stepwise increasing peak force. Testing was performed for augmented screws as well as for nonaugmented screws. Conclusion: The stabilising effect of cement augmentation in pedicle screws might not be as beneficial as expected from biomechanical pullout tests. Lengthening of the dorsal instrumentation results in a much higher increase of stability during fatigue testing in the osteoporotic spine compared to cement augmentation.
URI: http://hdl.handle.net/11420/3915
ISSN: 1436-6274
Institute: Biomechanik M-3 
Type: Review (Artikel)
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