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      저자 : Sebastian Hartmann (검색결과 2 건)
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        The Effect of Rod Pattern, Outrigger, and Multiple Screw-Rod Constructs for Surgical Stabilization of the 3-Column Destabilized Cervical Spine - A Biomechanical Analysis and Introduction of a Novel Technique

        Sebastian Hartmann,Claudius Thomé,Anto Abramovic,Sara Lener,Werner Schmoelz,Juliane Koller,Heiko Koller 대한척추신경외과학회 2020 Neurospine Vol.17 No.3

        Objective: Anterior-only reconstructions for cervical multilevel corpectomies are prone to fail under continuous mechanical loading. This study sought to define the mechanical characteristics of different constructs in reducing a range of motion (ROM) of the 3-column destabilized cervical spine, including posterior cobalt-chromium (CoCr)-rods, outrigger-rods (OGR), and a novel triple rod construct using lamina screws (6S3R). The clinical implications of biomechanical findings are discussed in depth from the perspective of the challenges surgeons face cervical deformity correction. Methods: Three-column deficient cervical spinal models were produced based on reconstructed computed tomography scans. The corpectomy defect between C3 and C7 end-level vertebrae was restored with anterior titanium (Ti) mesh-cage. The ROM was evaluated in a customized 6-degree of freedom spine tester. Tests were performed with different rod materials (Ti vs. CoCr), varying diameter rods (3.5 mm vs. 4.0 mm), with and without anterior plating, and using different construct patterns: bilateral rod fixation (standard-group), OGRgroup, and 6S3R-Group. Construct stability was expressed in changes and differences of ROM (°). Results: The largest reduction of ROM was noticed in the 6S3R-group compared to the standard- and the OGR-group. All differences observed were emphasized with an increasing number of corpectomy levels and if anterior plating was not added. For all simulated 1-, 2-, and 3-level corpectomy constructs, the OGR-group revealed decreased ROM for all motion directions compared to the standard-group. An increase of construct stiffness was also recorded for increased rod diameter (4.0 mm) and stiffer rod material (CoCr), though these effects lacked behind the more advanced construct pattern. Conclusion: A novel reconstructive technique, the 6S3R-construct, was shown to outperform all other constructs and might resemble a new standard of reference for advanced posterior fixation.

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        Maximal strength in the deep back squat correlates with sprinting performance over short distances

        Sebastian Möck,René Hartmann,Klaus Wirth,Gregor Rosenkranz,Christoph Mickel 국민체육진흥공단 한국스포츠정책과학원 2018 International Journal of Applied Sports Sciences Vol.30 No.2

        Sprinting is characterized by a transition from propulsion via knee extending musculature during initial acceleration towards ischiocrural musculature thereafter. This may lead to a decrease of correlation of the maximal strength in the back squat and sprinting performance with increasing distance. The aim of this investigation was to show the correlation between maximal dynamic force of the extensor chain of the lower limbs and short distance sprinting performance. Therefore, sprinting performance (0-5, 0-10, 0-15, 0-20, 0-25, 0-30m) and one repetition maximum (1RM) of 51 physical education students were determined. Pearson correlation coefficients were calculated and show significant (p < 0.01) correlations for the relationships with the absolute 1RM (r = -0.661 to -0.792) and the relative 1RM (r = -0.648 to -0.739). However, a decrease in correlation over distance was not found. The results show that the maximal strength of lower extremities’ extensors is a basic requirement in short distance sprinting and should be considered in training.

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