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.

[Is aseptic loosening of joint prostheses aseptic?].

The observed changes in the periarticular space may be caused by both mechanical action and biological reactions. Periprosthetic infections are the most common cause of loosening and destructive changes in the joints, however, the diagnosis of an aseptic reaction is not always fully obvious. Micromovements between the implant and the surrounding bone can cause remodeling of the bone trabeculae and migration of fibroblasts into the voids between the implant surface and the bone.

[Pro-health cycle lane versus environmental pollution and trauma].

A bicycle as a mean of transport and recreation, but is it a healthy lifestyle? The construction of numerous cycle lanes in cities and promotion of physical activity aims to encourage the public to move around by bicycle. The aim of mass cycling is to reduce car exhaust emissions and, on the other hand, to improve public health. The paper presents the potential benefits of cycling, but also its negative effects on the human body.

Analysis of mortality between 2019-2020 at the Neuroorthopedic and Traumatic Orthopedic Departments.

Unlabelled: The number of deaths from skeletal injuries is still significant, but is declining with advances in emergency medicine. The adopted principles of emergency procedures and the availability of specialist centres enable the treatment to be effective.

Aim: The aim of the study was to analyse the deaths of patients with spine and limb injuries who required surgery.

[Pathogenesis and the contemporary picture of polyneuropathy].

Demyelinating changes in peripheral nerves are responsible for the neurological symptoms found. Diabetes mellitus is one of the most common causes of polyneuropathy and is found in 8-54% of patients with type I diabetes, 13-46% of patients with type II and 22-66% of alcohol abusers. In turn, chemotherapy, depending on the therapeutic regimens used, is responsible for the symptoms of polyneuropathy in 10-90% of patients.

Numerical Simulation of Vehicle-Lighting Pole Crash Tests: Parametric Study of Factors Influencing Predicted Occupant Safety Levels.

In this paper, numerical simulations of the EN 12767 test procedure for a vehicle-lighting pole crash are presented. A representative soil-vehicle-lighting pole model is first developed. The Geo Metro vehicle model is used, and significant attention is given to representing the soil and its interaction with the traffic pole.

Hip arthoplasty in a forester after numerous tick bites.

Arthritis is one of the most important symptoms of late-stage borreliosis, observed in approximately 60% of untreated patients with Lyme disease. In several percent of them, this manifestation is of interest to orthopedic surgeons. The authors present a case of a patient, working as a forester, who underwent left hip replacement arthroplasty having contracted a infection in the past, and who was hospitalized 12 years before in the infectious ward due to suspected neuroborreliosis for which he was treated with Ceftriaxone 2 × 2.

Evaluation of the results of posterior approach in thoracic disc herniation surgery.

Unlabelled: The incidence of symptomatic intervertebral disc hernias in the thoracic segment is estimated at 1 case per million people per year, which is about 0.25-0.75% of all symptomatic intervertebral disc hernias and 0.

Affinity of Antifungal Isoxazolo[3,4-]pyridine-3(1)-Ones to Phospholipids in Immobilized Artificial Membrane (IAM) Chromatography.

Currently, rapid evaluation of the physicochemical parameters of drug candidates, such as lipophilicity, is in high demand owing to it enabling the approximation of the processes of absorption, distribution, metabolism, and elimination. Although the lipophilicity of drug candidates is determined using the shake flash method (-octanol/water system) or reversed phase liquid chromatography (RP-LC), more biosimilar alternatives to classical lipophilicity measurement are currently available. One of the alternatives is immobilized artificial membrane (IAM) chromatography.

Surgical treatment of thoracic disc herniation.

Symptomatic thoracic disc herniation is estimated on 1 person per million per year. 70% of all thoracic disc herniation cases are asymptomatic. This condition is often undiagnosed in regard to misguided clinical manifestations.

Assessment of the results of occipito-cervical stabilization in cranio-vertebral damage.

Unlabelled: Damage to the cranio-vertebral junction includes bone and ligament structures as well as the nervous system. Due to the unique structure of the occipital-atlanto-axial complex (C0-C1-C2) and biomechanical properties, they cause a surgical challenge. The aim of the surgery is to achieve bone fusion and stability of occipital-atlanto-axial complex.

Lipophilicity Determination of Antifungal Isoxazolo[3,4-]pyridin-3(1)-ones and Their N1-Substituted Derivatives with Chromatographic and Computational Methods.

The lipophilicity of a molecule is a well-recognized as a crucial physicochemical factor that conditions the biological activity of a drug candidate. This study was aimed to evaluate the lipophilicity of isoxazolo[3,4-]pyridine-3(1)-ones and their N1-substituted derivatives, which demonstrated pronounced antifungal activities. Several methods, including reversed-phase thin layer chromatography (RP-TLC), reversed phase high-performance liquid chromatography (RP-HPLC), and micellar electrokinetic chromatography (MEKC), were employed.

Finegoldia magna the cause of hip revision surgery - a two case report.

Unlabelled: The cause of septic arthritis in 20% of cases is anaerobic bacteria, including infections caused by Finegoldia magna. The occurrence of this pathogen in the etiology of postoperative post-implantive septic joint inflammations is estimated at 5-12% of all anaerobic infections, and 20-40% of all gram-positive anaerobic coccus (GPAC).

Case Reports: The 65-year-old male patient was admitted due to symptoms of pain in the left hip after having undergone arthroplasty three years prior.

Intradural disc herniation - report of two cases.

Unlabelled: Intradural disc herniation is a very rare condition, which occurs in up to 0.3% cases of all disc herniations. It mostly develops at L4-L5 level, which is caused by the presence of strong adhesions between the posterior longitudinal ligament and dura mater.

[Thrombosis of the medial artery imitating the symptoms of carpal tunnel syndrome - a case report].

Unlabelled: Carpal tunnel cyndrome is a condition resulting from the compression of the median nerve in the wrist canal. Thrombosis of the medial artery can exceptionally rarely mimic the symptoms of carpal tunnel syndrome.

A Case Report: The 46-year-old woman reported with typical symptoms of carpal tunnel syndrome.

Static and Dynamic Loading Behavior of Ti6Al4V Honeycomb Structures Manufactured by Laser Engineered Net Shaping (LENS) Technology.

Laser Engineered Net Shaping (LENS) is currently a promising and developing technique. It allows for shortening the time between the design stage and the manufacturing process. LENS is an alternative to classic metal manufacturing methods, such as casting and plastic working.

Spinal cord infarction after tumor removal surgery of the thoracic region - a case report.

Unlabelled: Spinal cord infarction is very rare condition and usually occurs in the thoracic region of the spine. The etiology is often unknown and patophysiology can be diverse. The stroke may occur while performing a surgical procedure, but it is also found in vascular diseases, for example dissecting aneurysms, vasculitis and vascular malformations.

Radiological evaluation of the Stoffella metatarsal I osteotomy in the treatment of hallux valgus.

Unlabelled: The Stoffella surgical method is a reverse Chevron distal metatarsal osteotomy, typically used in younger patients, with good bone quality. The technique is suitable for a variety of cases, from mild to severe, since the head of the first metatarsal may be moved laterally to the edge of the first metatarsal bone, thereby allowing for a significant degree of correction.

Aim: The aim of the paper is to review the radiological results of patients suffering from hallux valgus who underwent Stoffella metatarsal I osteotomy.

Identification of Mechanical Properties for Titanium Alloy Ti-6Al-4V Produced Using LENS Technology.

This paper presents a characterization study of specimens manufactured from Ti-6Al-4V powder with the use of laser engineered net shaping technology (LENS). Two different orientations of the specimens were considered to analyze the loading direction influence on the material mechanical properties. Moreover, two sets of specimens, as-built (without heat treatment) and after heat treatment, were used.

[Chirurgiczne leczenie uszkodzeń połączenia czaszkowokręgosłupowego].

Unlabelled: Damages of the cranio-vertebral junction include bone and ligamentous structures. Due to the unique design of the C0-C1-C2 complex and biomechanical properties, they represent a major surgical challenge. Treatment of damage to this area involves decompression of nerve structures with simultaneous occipito-cervical fixation from posterior access.

[Leczenie operacyjne złamań zęba obrotnika z dostępu przedniego].

Unlabelled: The surgical treatment of the odontoid fractures is an important problem in the practice of medical teams involved in spinal surgery. There is still no consensus on dealing with fractures C2. The stabilization of the rodontoid with 1 or 2 cannulated screws (AOSF) is currently one of the options in the treatment of C2 unstable fractures since Bohler and Nakanishi introduced this method.