Sample records for postum
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Hammer, Niels; Hirschfeld, Ulrich; Strunz, Hendrik; Werner, Michael; Wolfskämpf, Thomas; Löffler, Sabine
2017-01-01
Introduction . The triangular fibrocartilage complex (TFCC) provides both mobility and stability of the radiocarpal joint. TFCC lesions are difficult to diagnose due to the complex anatomy. The standard treatment for TFCC lesions is arthroscopy, posing surgery-related risks onto the patients. This feasibility study aimed at developing a workup for soft-tissue reconstruction using clinical imaging, to verify these results in retrospective patient data. Methods . Microcomputed tomography ( μ -CT), 3 T magnetic resonance imaging (MRI), and plastination were used to visualize the TFCC in cadaveric specimens applying segmentation-based 3D reconstruction. This approach further trialed the MRI dataset of a patient with minor radiological TFCC alterations but persistent pain. Results . TFCC reconstruction was impossible using μ -CT only but feasible using MRI, resulting in an appreciation of its substructures, as seen in the plastinates. Applying this approach allowed for visualizing a Palmer 2C lesion in a patient, confirming ex postum the arthroscopy findings, being markedly different from MRI (Palmer 1B). Discussion . This preliminary study showed that image-based TFCC reconstruction may help to identify pathologies invisible in standard MRI. The combined approach of μ -CT, MRI, and plastination allowed for a three-dimensional appreciation of the TFCC. Image quality and time expenditure limit the approach's usefulness as a diagnostic tool.
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Hirschfeld, Ulrich; Strunz, Hendrik; Werner, Michael; Wolfskämpf, Thomas; Löffler, Sabine
2017-01-01
Introduction. The triangular fibrocartilage complex (TFCC) provides both mobility and stability of the radiocarpal joint. TFCC lesions are difficult to diagnose due to the complex anatomy. The standard treatment for TFCC lesions is arthroscopy, posing surgery-related risks onto the patients. This feasibility study aimed at developing a workup for soft-tissue reconstruction using clinical imaging, to verify these results in retrospective patient data. Methods. Microcomputed tomography (μ-CT), 3 T magnetic resonance imaging (MRI), and plastination were used to visualize the TFCC in cadaveric specimens applying segmentation-based 3D reconstruction. This approach further trialed the MRI dataset of a patient with minor radiological TFCC alterations but persistent pain. Results. TFCC reconstruction was impossible using μ-CT only but feasible using MRI, resulting in an appreciation of its substructures, as seen in the plastinates. Applying this approach allowed for visualizing a Palmer 2C lesion in a patient, confirming ex postum the arthroscopy findings, being markedly different from MRI (Palmer 1B). Discussion. This preliminary study showed that image-based TFCC reconstruction may help to identify pathologies invisible in standard MRI. The combined approach of μ-CT, MRI, and plastination allowed for a three-dimensional appreciation of the TFCC. Image quality and time expenditure limit the approach's usefulness as a diagnostic tool. PMID:28246600
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NASA Astrophysics Data System (ADS)
Teodorani, M.
1999-03-01
The psycho-sociological reasons why the academic science is not willing to face operatively and officially a hard problem such as the 'UFO phenomenon', are introduced in the ambit of an episthemological discussion. It is shown how such a phenomenon, due to his peculiar nature, might impose a drastic revision of the laws of physics which are commonly accepted. It is demonstrated how a strict application of the measurement methods which are normally adopted by physics can permit to obtain relevant quantitative results, whatever they are. As an example of such a procedure, the anomalous light phenomenology which reoccurs in the Hessdalen valley in Norway is presented, by showing that it represents so far the ideal worldly physical laboratory for the study of luminous phenomena in the low atmosphere. After describing the multiform morphologic and dynamic characteristics of the luminous component of the phenomenon as they are deduced from visual and photographic reports, the results coming out from the magnetometric, radiometric and radar monitoring operations which were carried out by Project Hessdalen in 1984, are presented in detail. Subsequently, the postumous analysis carried out by the author is shown, by pointing out the clear cohexistence of the magnetic and the optical phenomenology and the apparent correlation of the magnetic component of the phenomenon with maxima of solar activity. In a subsequent phase, the most credited physical theories, which have been proposed so far in order to interpret the phenomenon, are described and discussed, together with 'non-canonical hypotheses'. Finally, it is pointed out how the physical parameters which are expected to be measured with the proper instrumented equipment and aimed tactics and strategies, resemble strictly the methodology which is normally used during astrophysical observations.