JH-2 constitutive model of sandstone for dynamic problems.

This paper demonstrates the application of the Johnson-Holmquist II (JH-2) model with correlated and validated parameters to simulate the behavior of a sandstone. The JH-2 model is used to simulate various tests, including single-element tests, structural quasi-static uniaxial and triaxial compression tests, and the split Hopkinson pressure bar test. Additionally, the model is used to simulate drop-weight impact test using a ball bearing and two loading scenarios involving small-scale blasting and projectile impacts.

Reoperation rate after fusion and non-fusion surgery for degenerative lumbar spine disease.

Introduction: The number of reoperations increases with the growing number of operations performed.

Methods: The clinical material included a group of 2194 patients treated surgically due to degenerative disease of the lumbar spine; we selected a total of 332 patients who were reoperated, and the indications for reoperation were analysed.

Results: The percentage of patients operated due to adjacent segment disease in the group of patients with stabilization was on average 8.

Long-term nusinersen treatment across a wide spectrum of spinal muscular atrophy severity: a real-world experience.

Background: Spinal muscular atrophy (SMA) is an autosomal recessive disorder caused by a biallelic mutation in the SMN1 gene, resulting in progressive muscle weakness and atrophy. Nusinersen is the first disease-modifying drug for all SMA types. We report on effectiveness and safety data from 120 adults and older children with SMA types 1c-3 treated with nusinersen.

An Analysis of the Risk Factors for Postural Defects among Early School-Aged Children.

Unlabelled: A considerable number of problems begin in childhood due to lifestyle changes, which include a transition from a previous period of extensive movement to prolonged hours of staying in a sitting position at school. The aim of this study was to examine the occurrence of back and side view postural defects in the study group of school-aged children and identify risk factors associated with the formation of postural abnormalities in the study group.

Methods: This study was conducted on a group of 141 children aged 7-10, attending the first to third grades at a primary school in Białystok (northeastern Poland).

Metal hypersensitivity in hip, knee and spine surgery.

The number of implanted joint prostheses and damaged spinal components is steadily increasing. At the same time, rejection of the implanted material is observed in operated patients, which manifests itself in both skin and general reactions, as well as loosening and earlier wear of implanted prostheses, which was previously referred to as aseptic reactions. However, it has been shown that in a significant proportion of patients, rejection of implanted material may be caused by hypersensitivity to a specific metal.