A patient who had had a traffic accident resulting with a compression fracture of the L1 vertebra but with no neurological deficits, developed urinary incontinence and weakness in his lower extremities 25 years after the spinal injury. An MRI scan of the spine revealed gliosis of the conus medullaris at the level of the compression fracture, with syringohydromyelia extending from T6 to conus medullaris. The patient underwent a rehabilitation program at the end of which he was able to ambulate independently.
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http://dx.doi.org/10.1038/sc.1996.55 | DOI Listing |
ACS Appl Mater Interfaces
January 2025
Laser Thermal Laboratory, Department of Mechanical Engineering, University of California, Berkeley, California 94720, United States.
Microadditive manufacturing has revolutionized the production of complex, nano- to microscale components across various fields. This work investigates two-photon (2P) and three-photon (3P) fluorescence imaging, as well as third-harmonic generation (THG) microscopy, to examine periodic microarchitected lattice structures fabricated using multiphoton lithography (MPL). By immersing the structures in refractive index matching fluids, we demonstrate high-fidelity 3D reconstructions of both fluorescent structures using 2P and 3P microscopy as well as low-fluorescence structures using THG microscopy.
View Article and Find Full Text PDFJ Robot Surg
January 2025
Department of Orthopaedics, Affiliated Hospital of Integrated Traditional Chinese and Western Medicine, Nanjing University of Chinese Medicine, Nanjing, 210028, Jiangsu, China.
The rising incidence of osteoporotic vertebral compression fractures (OVCF) has increased the demand for precise treatments like robot-assisted percutaneous vertebroplasty (PVP), especially for conditions like Kümmell's disease that require high surgical accuracy. However, the traditional tracer fixation method has certain limitations. This study aimed to compare the safety and clinical efficacy of a modified tracer fixation technique with the traditional fixation method in robot-assisted percutaneous vertebroplasty (PVP) for Kümmell's disease.
View Article and Find Full Text PDFBone Joint Res
January 2025
Department of Mechanical Engineering & Mechanics, Lehigh University, Bethlehem, Pennsylvania, USA.
Aims: The "2 to 10% strain rule" for fracture healing has been widely interpreted to mean that interfragmentary strain greater than 10% predisposes a fracture to nonunion. This interpretation focuses on the gap-closing strain (axial micromotion divided by gap size), ignoring the region around the gap where osteogenesis typically initiates. The aim of this study was to measure gap-closing and 3D interfragmentary strains in plated ovine osteotomies and associate local strain conditions with callus mineralization.
View Article and Find Full Text PDFJ Am Geriatr Soc
December 2024
Northwell Health, New Hyde Park, New York, USA.
Macromol Rapid Commun
December 2024
School of Materials Engineering, Purdue University, West Lafayette, IN, 47907, USA.
Examining the mechanical properties of polymer thin films is crucial for high-performance applications such as displays, coatings, sensors, and thermal management. It is important to design thin film microstructures that excel in high-demand situations without compromising mechanical integrity. Here, a polymer blend of polystyrene (PS) and polyisoprene (PI) is used as a model to explore microscale deformation behavior under uniaxial mechanical testing.
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