Immediate stabilization of pedicle screws
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Author (Corporation)
Publication date
2023
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01A - Journal article
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Parent work
Current Directions in Biomedical Engineering
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DOI of the original publication
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Volume
9
Issue / Number
1
Pages / Duration
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Publisher / Publishing institution
De Gruyter
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Abstract
This study was designed as proof of principle and safety test of the novel technique, the Immediate Stabilization System (ISS). The technique is designed to immediately stabilize polymer-augmented pedicle screws (PAS) in deficient bone and avoid complications of loosening pedicle screws at the bone-screw interface, especially in osteoporotic patients. A polymer sleeve was designed as augmentation to improve screw anchorage after drilling the screw hole. By applying ultrasonic energy, the polymeric tube was molded into the pores of the host bone forming a strong and uniform bond with the adjacent bone. The original screw was then implanted into the denser bony environment leading to an enhanced immediate stability. The ISS-treated implants were compared to conventionally placed pedicle screws in ex-vivo cadaver bones (2 sheep spines, n = 6 implants per spine, total 12 screws) and in-vivo in a spinal sheep model (Swiss alpine sheep, n = 5, 4 implants per animal, total 20 screws). The primary stability of ISS-treated pedicle screws was increased in ex-vivo bone (+24% insertion torque (IT)) and in-vivo (+32.9% IT) in sheep spine. Removal torque (RT) was lower in the in PAS tested for 8 weeks in-vivo. The ISS technology demonstrated improved anchorage of pedicle screws in ex-vivo cadaver bones as well as in-vivo studies in sheep spine.
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ISBN
ISSN
2364-5504
Language
English
Created during FHNW affiliation
Yes
Strategic action fields FHNW
Publication status
Published
Review
Peer review of the complete publication
Open access category
Gold
License
Citation
de Wild, M., Zimmermann, S., Klein, K., Steffen, T., Schlottig, F., Hasler, C., & Rechenberg, B. v. (2023). Immediate stabilization of pedicle screws. Current Directions in Biomedical Engineering, 9(1). https://doi.org/10.1515/cdbme-2023-1004