Auflistung nach Autor:in "Goldhahn, Jörg"

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    Publikation
    Ultrasound melted polymer sleeve for improved screw anchorage in trabecular bone-A novel screw augmentation technique
    (Elsevier, 23.02.2016) Schmoelz, Werner; Mayr, Raul; Schlottig, Falko; Ivanovic, Nikola; Hörmann, Romed; Goldhahn, Jörg
    Background: Screw anchorage in osteoporotic bone is still limited and makes treatment of osteoporotic fractures challenging for surgeons. Conventional screws fail in poor bone quality due to loosening at the screw-bone interface. A new technology should help to improve this interface. In a novel constant amelioration process technique, a polymer sleeve is melted by ultrasound in the predrilled screw hole prior to screw insertion. The purpose of this study was to investigate in vitro the effect of the constant amelioration process platform technology on primary screw anchorage. Methods: Fresh frozen femoral heads (n=6) and vertebrae (n=6) were used to measure the maximum screw insertion torque of reference and constant amelioration process augmented screws. Specimens were cut in cranio-caudal direction, and the screws (reference and constant amelioration process) were implanted in predrilled holes in the trabecular structure on both sides of the cross section. This allowed the pairwise comparison of insertion torque for constant amelioration process and reference screws (femoral heads n=18, vertebrae n=12). Prior to screw insertion, a micro-CT scan was made to ensure comparable bone quality at the screw placement location. Findings: The mean insertion torque for the constant amelioration process augmented screws in both, the femoral heads (44.2Ncm, SD 14.7) and the vertebral bodies (13.5Ncm, SD 6.3) was significantly higher than for the reference screws of the femoral heads (31.7Ncm, SD 9.6, p<0.001) and the vertebral bodies (7.1Ncm, SD 4.5, p<0.001). Interpretation: The interconnection of the melted polymer sleeve with the surrounding trabecular bone in the constant amelioration process technique resulted in a higher screw insertion torque and can improve screw anchorage in osteoporotic trabecular bone.
    01A - Beitrag in wissenschaftlicher Zeitschrift
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    Publikation
    Virtual supersampling as post-processing step preserves the trabecular bone morphometry in human peripheral quantitative computed tomography scans
    (Public Library of Science, 2019) Schulte, Friederike A.; Christen, Patrik; Badilatti, Sandro D.; Parkinson, Ian; Khosla, Sundeep; Goldhahn, Jörg; Müller, Ralph
    In the clinical field of diagnosis and monitoring of bone diseases, high-resolution peripheral quantitative computed tomography (HR-pQCT) is an important imaging modality. It provides a resolution where quantitative bone morphometry can be extracted in vivo on patients. It is known that HR-pQCT provides slight differences in morphometric indices compared to the current standard approach micro-computed tomography (micro-CT). The most obvious reason for this is the restriction of the radiation dose and with this a lower image resolution. With advances in micro-CT evaluation techniques such as patient-specific remodeling simulations or dynamic bone morphometry, a higher image resolution would potentially also allow the application of such novel evaluation techniques to clinical HR-pQCT measurements. Virtual supersampling as post-processing step was considered to increase the image resolution of HR-pQCT scans. The hypothesis was that this technique preserves the structural bone morphometry. Supersampling from 82
    01A - Beitrag in wissenschaftlicher Zeitschrift