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Purpose: The purpose of this study was to examine the effects of intraoperative technology use on the rate of using polyethylene liners 15 mm or greater during primary total knee arthroplasty (TKA). Methods: There were 103,295 implants from 16,386 primary unilateral TKAs performed on 14,253 patients at a single institution between 1 January 2018, and 30 June 2022, included in the current study. Robotic assistance and navigation guidance were used in 1274 (8%) and 8345 (51%) procedures, respectively. The remaining 6767 TKAs (41%) were performed manually. Polyethylene liners were manually identified and further subcategorised by implant thickness. Patients who underwent robotic‐assisted TKA were younger (p < 0.001) and more likely to be male (p < 0.001) compared to patients who underwent navigation‐guided or manual TKAs. Results: Average polyethylene liner thickness was similar between groups (10.5 ± 1.5 mm for robotic‐assisted TKAs, 10.9 ± 1.8 mm for navigation‐guided TKAs and 10.8 ± 1.8 mm for manual TKAs). The proportions of polyethylene liners 15 mm or greater used were 4.9%, 3.8% and 1.9% for navigation‐guided, manual and robotic‐assisted procedures, respectively (p < 0.001). Multivariate regression analyses demonstrated that navigation‐guided (odds ratio [OR]: 2.6, 95% confidence Interval [CI]: [1.75–4.07], p < 0.001) and manual (OR: 2.0, 95% CI: [1.34–3.20], p = 0.001) procedures were associated with an increased use of polyethylene liners 15 mm or greater. Conclusion: Robotic‐assisted TKA was associated with a lower proportion of polyethylene liners 15 mm or greater used compared to navigation‐guided and manual TKA. These findings suggest that robotic assistance can reduce human error via a more precise cutting system, limit over‐resection of the tibia and flexion‐extension gap mismatch and ultimately allow for more appropriately sized implants. Level of Evidence: Level III, retrospective cohort study. [ABSTRACT FROM AUTHOR]

Background: Occlusal contacts can be stained and thereby visualised employing occlusal indicators. Qualitative and quantitative indicators are differentiated. The hybrid system OccluSense supposedly combines analogue contact marking and digital registration of contacts. The reliability and validity of its contact marking have not yet been validated. Objectives: The aim of this controlled randomised in‐vitro study was to examine the reliability and validity of analogue contact staining with OccluSense compared to Arti‐Fol and the reference standard Gnatho‐Film. Materials and Methods: An experimental apparatus was designed to simulate static occlusion. The occlusal contacts were stained 50 times with Gnatho‐Film to determine the average number and location of contacts registered. For comparison, the contacts were pre‐stained with Gnatho‐Film and then registered with Arti‐Fol or OccluSense 50 times each. Every staining was statistically evaluated and compared to Gnatho‐Film alone, regarding the number and location of contacts. Based on the observed characteristic staining behaviour of OccluSense, a modified evaluation strategy was developed for its colour markings (OccluSense (mod.)). Results: Both evaluations of OccluSense determine that the same number of contacts was registered in over 94% of all cases. Neither OccluSense nor Arti‐Fol stain the exact same number of contacts as Gnatho‐Film, but the modified evaluation OccluSense (mod.) did improve the results for validity. Conclusion: When employing the modified evaluation strategy, OccluSense staining achieves similar reliability and validity as the reference standard. Pre‐colouring of occlusal contacts with Gnatho‐Film and the modified evaluation strategy, might become standard for analysing occlusal contacts stained by OccluSense in the future. [ABSTRACT FROM AUTHOR]

Thermoplastics have a crystal structure. It has been pointed out that the crystalline structure affects viscoelastic behavior in crystalline polymers, which must be taken into account in MD simulations. In this study the crystalline lamellar structure of Polyethylene (PE) was reproduced via molecular dynamics. To investigate the mechanical behavior and deformation behavior of the lamellar structure of PE, deformation was applied to the model under a constant tensile rate and constant tensile load as tensile and creep analyses, respectively. A tensile analysis indicated localized cracking, and a creep analysis revealed molecular-chain undulation along the tensile direction. To clarify the reason for the difference in deformation distribution between tensile and creep analyses, the potential energy during tensile loading was examined. In the tensile analysis, all the potential energies increased at the start of tension development and decreased rapidly at the break. As revealed in the creep analysis, the bond stretching and bond angle potential energies did not change when deformation started at a strain of approximately 0.20. These results indicated that the deformation behavior depended on the loading configuration, such as tensile and creep loading, and that deformation behaviors vary because of differences in displacement distribution and potential energy. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Nanchang University (Engineering & Technology) is the property of Nanchang University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This paper presents Martin Buber's unpublished manuscript 'Fragen und Antworten. Die jüdische Besiedlung Palästinas' in the original German with English translation and contextualizes it within the main stations of Buber's Zionist thinking: cultural Zionism, religious Zionism, and Zionism of realization. It problematizes Buber's reflection on Jewish settlements in Palestine with reference to the significance of Zionism for humanity as well as the possibility of reconciliation between Jews and Arabs in the Middle East. It also addresses the problem of Jewish terror, framing it in correlation with the restrictions on Jewish migration to Palestine and the catastrophe of the Shoah. [ABSTRACT FROM AUTHOR]

Copyright of Plastics Science & Technology / Suliao Ke-Ji is the property of Plastics Science & Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Plastics Science & Technology / Suliao Ke-Ji is the property of Plastics Science & Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Plastics Science & Technology / Suliao Ke-Ji is the property of Plastics Science & Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective: To compare the clinical outcomes between ceramic-on-ceramic (CoC) and ceramic-on-polyethylene (CoP) bearing surfaces in patients undergoing total hip arthroplasty (THA) through a pooled analysis and evidence update. Methods: We performed a systematic literature search using PubMed, Embase, Cochrane Library and Web of Science up to March 2023 for studies that compared the bearing surfaces of CoC and CoP in patients undergoing THA. The primary outcomes were the incidence of common postoperative complications and the rate of postoperative revision. The secondary outcome was the Harris Hip Score. Results: A total of 10 eligible studies involving 1,946 patients (1.192 CoC-THA versus 906 CoP-THA) were included in the evidence synthesis. Pooled analysis showed no significant difference in the rates of common postoperative complications (dislocation, deep vein thrombosis, infection, wear debris or osteolysis) and of revision. After eliminating heterogeneity, the postoperative Harris Hip Score was higher in the CoC group than in the CoP group. However, the strength of evidence was moderate for the Harris Hip Score. Conclusion: CoC articulations are more commonly used in younger, healthier, and more active patients. While the performance of conventional polyethylene is indeed inferior to highly cross-linked polyethylene, there is currently a lack of sufficient research comparing the outcomes between highly cross-linked polyethylene and CoC bearing surfaces. This area should be a focal point for future research, and it is hoped that more relevant articles will emerge. Given the limited number of studies included, the heterogeneity and potential bias of those included in the analysis, orthopaedic surgeons should select a THA material based on their experience and patient-specific factors, and large multicentre clinical trials with >15 years of follow-up are needed to provide more evidence on the optimal bearing surface for initial THA. [ABSTRACT FROM AUTHOR]

High-density polyethylene (HDPE) pipes have gradually become the first choice for gas networks because of their excellent characteristics. As the use of pipes increases, there will unavoidably be a significant amount of waste generated when the pipes cease their operation life, which, if improperly handled, might result in major environmental contamination issues. In this study, the thermal degradation of polyethylene materials is simulated for different pressures (10, 50, 100, and 150 MPa) and temperatures (2300, 2500, 2700, and 2900 K) in the framework of Reactive Force Field (ReaxFF) molecular dynamics simulation. The main gas products, density, energy, and the mean square displacement with temperature and pressure are also calculated. The findings indicate that raising the temperature leads to an increase in the production of gas products, while changing the pressure has an impact on the direction in which the products are generated; the faster the temperature drops, the less dense the air; both temperature and pressure increase impact the system's energy conversion or distribution mechanism, changing the system's potential energy as well as its total energy; the rate at which molecules diffuse increases with temperature, and decreases with pressure. The results of this investigation provide a theoretical basis for the development of the pyrolytic treatment of polyethylene waste materials. [ABSTRACT FROM AUTHOR]

The effect of the storage conditions of light (presence; absence) and relative humidity (50%; 75% RH) on the water content and colour of Porphyridium cruentum microalga powder was studied, then two packaging materials, low-density polyethylene (PE-LD) and metallised polyethylene terephthalate with polyethylene (PETmet/PE), were used to study their effect on the water content, colour, total carotenoids and chlorophylls contents, total phenolic content (TPC), and antioxidant activity (ABTS, DPPH, ORAC) of P. cruentum during storage at 23 °C and 50% RH. An atmosphere with 50% RH is recommended to minimise the water vapour absorption and lightness loss. In addition to the expected light protection, PETmet/PE material protected P. cruentum powder also against water absorption, contrary to PE material. There were no relevant colour changes of the microalga during storage in PETmet/PE. Regarding the total content of carotenoids and the antioxidant activity of the microalga, no significant differences were found between the biomasses stored in either packaging material. The TPC and DPPH values were practically constant during two months of storage, while ABTS and ORAC decreased more than 50% and 20%, respectively, during this time. [ABSTRACT FROM AUTHOR]

As an essential component of urban infrastructure construction, polyethylene (PE) pipelines face the challenging task of underground detection due to the complex and dynamic nature of the subsurface environment, diverse installation paths, and the inherent insulating properties of PE materials. In order to address the non-excavation detection of buried PE pipelines, this paper proposes an acoustic method based on the long short-term memory (LSTM) neural network. The study begins by analyzing the propagation and reflection mechanisms of elastic waves in the pipe-soil coupling system, and a impact excitation source is designed to generate the excitation signal. After establishing the experimental environment and collecting experimental data, a comprehensive analysis is conducted, and the LSTM neural network is employed for data classification to determine the presence of buried PE pipelines. Through neural network training, accurate identification of the PE pipeline's existence and prediction of its burial depth are achieved, providing an efficient and reliable solution for buried PE pipeline detection. The practical results demonstrate the significant application prospects of the combined acoustic method and LSTM neural network in buried PE pipeline detection. This research contributes a novel solution to the field of non-destructive PE pipeline detection, with both theoretical and practical implications. [ABSTRACT FROM AUTHOR]

The electrical percolation of alternating current through two-phase polyethylene/graphite composite electrodes with different contents of graphite microparticles immersed in aqueous KCl solutions has been studied. Above the graphite content of the first percolation threshold, the electrochemical impedance response of this electrode is associated with an equivalent circuit of resistance R u in series with a constant phase element (CPE). An insulator material + conducting filler model is proposed in which the electroactive surface is considered as the intersection of the percolation cluster through the solid and the cluster associated with the interfacial region. CPE is analyzed assuming a distribution of microcapacitors of the graphite particles in contact with the dielectric solution and inside the dielectric polymeric phase. [ABSTRACT FROM AUTHOR]

Plastic recycling facilities (PRF) are one of microplastic sources that may release into the environment. This study aims to identify the abundance and characteristics of microplastics potentially released from a PRF in Indonesia. Analysis of raw materials in the influent of the wastewater treatment plant (WWTP) showed a microplastic abundance of 485 particles/L. The dominant type of microplastic was the 2.5 μm - 5 mm size of fragmented highdensity polyethylene (HDPE). In the effluent of floating clarifier 3, the microplastic abundance detected was 98 particles/L, with low-density polyethylene (LDPE) as the dominant fragmented plastic ranging from 1.2-2.5 μm. Meanwhile, in the WWTP sludge, microplastics were identified with an abundance of 364.81 particles/kg. The microplastics found in the sludge were predominantly in the fragment form, composed of HDPE, with sizes ranging from 0.2-2.5 µm. This information is crucial for understanding the extent to which PRFs contribute to microplastic pollution in the environment. These findings emphasize the importance of implementing more effective wastewater management technologies in PRFs to reduce the release of microplastics into the environment. [ABSTRACT FROM AUTHOR]

The effect of the preparation method of the mixture catalyst/polymer on the linear low‐density polyethylene (LLDPE) pyrolysis is studied by comparing the results obtained when the polymer and the catalyst (Hβ or HZSM‐5) are extruded or simply mixed in powder form. By improving the polymer/catalyst contact through extrusion, the polymer degradation took place at lower temperature. The effect of extrusion is more pronounced with Hβ compared to HZSM‐5 owing to the highest external surface of Hβ. While the yields of gas/liquid/coke do not differ with the preparation method when HZSM‐5 is used as catalyst, more significant amount of liquid phase and high production of paraffins are observed when Hβ/LLDPE mixture is extruded, according to random scission pathway reactions. The subsequent reactions are limited by the size of the pore, which impede hydrogenation reactions, producing high molecular weight molecules. Regardless of zeolite type, the micropores of the zeolite are more affected by deactivation by coke when extrusion method is used, this effect being much more important for HZSM‐5. This result is a consequence of a polymer pre‐degradation during the extrusion process in which the first cracks of the polymer at low temperature and the first pore blockages can be generated. [ABSTRACT FROM AUTHOR]

This study investigates the potential for recycling fishing rope waste from the Magdalen Islands, Canada, into sustainable wall cladding panels, addressing both environmental concerns and waste management challenges. A comprehensive characterization of the fishing ropes was conducted using various analytical techniques to assess their suitability for recycling. Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) identified polyethylene (PE) and isotactic polypropylene (iPP) as the main polymers present in the ropes, with a composition of approximately 25% PE and 75% PP. The effects of photodegradation were evaluated through carbonyl index analysis, differential scanning calorimetry (DSC), tensile testing, and gel permeation chromatography (GPC). The results showed reduced crystallinity, a 20% decrease in tensile strength, and lower molecular weights due to environmental exposure in comparison with unused ropes. However, melt flow rate (MFR) measurements aligned with virgin HDPE and PP values used in rope manufacturing, indicating suitable processability for recycling. Panels produced from recycled fishing ropes exhibited lower flexural and impact properties compared to commercial alternatives due to the presence of mineral contaminants and voids in the panels as revealed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). This comprehensive investigation provides valuable insights into the potential repurposing of fishing rope waste, contributing to the development of sustainable waste management strategies for coastal communities. [ABSTRACT FROM AUTHOR]

This paper describes the development of new types of dynamically cross-linked thermoplastic elastomers based on ethylene-propylene-terpolymer rubber and low-density polyethylene, reinforced with plasticized starch and montmorillonite with a chemically modified surface. An octylphenolformaldehyde resin in the presence of stannous chloride dihydrate was used as a vulcanizing agent. The samples were obtained on a Brabender Plasti-Corder mixer, at appropriate temperatures and rotation speeds, using the dynamic vulcanization method and the melt intercalation technique. The mixtures obtained were modeled in the form of plates with standard dimensions using specific molds and a laboratory-scale electrical press. The obtained samples were analyzed from the point of view of the physical-mechanical properties, the melt flow index, as well as from the structural and morphological point of view. It was observed that the characteristics of the samples are influenced by both the composition and the methods of obtaining used. According to the obtained characteristics, the new elasto-plastic materials can be used in fields such as the footwear industry (for the production of: soles, heels, protective boots), in the rubber and plastics industry, the automobile industry, agriculture or construction (when making gaskets, technical items, hoses, etc.). They can be easily processed into different finished products by methods specific to plastics. [ABSTRACT FROM AUTHOR]

The paper presents our studies regarding the superior valorization of recycled low-density polyethylene (rLDPE) by compounding with thermoplastic starch (TPS) and ethylene propylene terpolymer elastomer (EPDM). Low-density polyethylene post-consumer waste from foil packaging was used for the experiments. The waste was mechanically recycled and the rLDPE granules obtained were characterized both from a physical-mechanical and structural point of view. In order to obtain new sustainable materials, rLDPE granules were mixed with TPS, EPDM, compatibilizers and crosslinking agents. The mixtures were obtained in a PlastiCorder Brabender mixer at 140°C, 30-80 rpm, working time 7 minutes. The obtained samples show very good resistance to abrasion, have very good values of Charpy impact strength and tensile strength, show very good behaviour to accelerated aging and to the action of some liquids, they have high hardness (51-53) °ShD and a Vicat softening point of 93-96°C. The new materials can be processed by methods specific to plastic materials (extrusion, injection, compression) in order to obtain finished products, and their fields of application can include: the footwear industry, the automotive industry, construction, packaging, agriculture, etc. The thermal analyses showed that up to a temperature of 130°C, the samples have good thermal stability, the mass loss being 0.33-0.79%. The LCA analysis of the composites shows a low environmental impact. The values of the carbon footprint range between 0.58 Kg CO2 eq/kg and 0.75 Kg CO2 eq /kg due to the use of recycled low-density polyethylene and optimised efficient production process. [ABSTRACT FROM AUTHOR]

Professor V.A. Dodonov created, based on a complex of an organoboron compound with an amine, a two-pack aerobically curing adhesive capable of gluing polymers with low surface energy (polyethylene, polypropylene, polyvinyl chloride, Teflon) at room temperature. The trialkylborane-amine complex, when exposed to acid, releases R3B, which is oxidized by oxygen and causes radical polymerization of the monomeric acrylate base and grafting to the surface of the polymers. [ABSTRACT FROM AUTHOR]

Long-term hydrostatic (LTH) capacity test up to 10,000 h of polyethylene pipe (PE pipe) was successfully conducted according to Arrhenius theory. It was revealed that in some cases the pipe damage points initiate within the marker line on pipe body, indicating that the addictive of marker line could somehow weaken the mechanical property of pipe base materials. Test pressure test time data was fitted using dual-parameter model under the guidance of ISO9080: 2012, and its serving life was calculated as 28.9 years, ductile-brittle transition point was found at 8456 h. Conclusions drawn from this paper could contribute to understanding the long-term mechanical behaviour of PE pipe. [ABSTRACT FROM AUTHOR]

Microplastics (MPs), which are emerging pollutants in terrestrial ecosystems, could potentially impact plant growth. One of the least explored aspects of crop development is seed germination, a crucial stage in the plant's lifecycle. This study conducted soil cultivation trials to investigate the effects of 1% (w/w) concentrations of polyethylene (PET), polypropylene (PP), and polystyrene (PS) MPs on rice growth over a 15‐day period. Parameters such as fresh weight, shoot height, root length, chlorophyll levels, and MPs identification in the roots were observed. The findings revealed the accumulation of 6–9 MP items in the roots. PET MPs inhibited root elongation (15%–20%), reduced shoot height (15%–30%), and decreased rice fresh weight (12%–37%). MPs PET, PP, and PS contamination reduced the content of chlorophyll a (15%–43%), b (21%–41%), and total (11%–40%) in rice leaves. This study enhances our understanding of the ecotoxicological effects of these three types of MPs on rice. The utilization of this data will further inform our understanding of MPs' behavior in soil vegetation and provide valuable insights into their land‐based impacts. [ABSTRACT FROM AUTHOR]

The ReMotion wrist replacement has good short- to medium-term survival with an acceptable complication profile as we previously reported in a cohort of patients with rheumatoid arthritis. We now report the long-term results of the same cohort and details of explant analysis of revisions undertaken for aseptic loosening. A total of 16 wrists were reviewed. Seven prostheses remain in situ with no obvious signs of wear or radiological loosening at a mean follow-up of 15.5 years. Three wrists had been revised: one for infection and two for aseptic loosening. Five patients (six wrists) died 2–9 years after operation from unrelated causes. Explant analysis demonstrated relatively minor wear compared with the published results of the Universal-2 prosthesis. We hypothesize that this may be explained by differences in polyethylene sterilization and prosthetic design. The ReMotion wrist replacement has favourable long-term results in patients with rheumatoid arthritis with a 16-year survival rate of 78%–86%. Level of evidence: IV [ABSTRACT FROM AUTHOR]

Abstract Microplastics (MPs)-induced changes in soil nutrient cycling and microbial activity may pose a potential risk to soil ecosystem. Although some studies have explored these topics, there is still a large space for exploration and a relative lack of research on the mechanism by which soil health and its functions are affected by these changes. Thus, this study investigated the effects of polyethylene (PE) MPs with two particle sizes (13 μm and 130 μm) at five concentrations (0%, 1%, 3%, 6% and 10%, w/w) on soil biochemical properties and ecosystem function. The findings revealed that the exposure to 13 μm MPs significantly reduced soil respiration (Res) rate, β-glucosidase (Glu) and catalase (CAT) activity, which accompanied with enhanced urease activity and decreased soil pH, available phosphorus (AP), dissolved reactive phosphorus (DRP), dissolved organic carbon (DOC) and available potassium (AK) content in most cases. However, 130 μm MPs exerted negligible influence on the DOC and DRP content, Glu and CAT activity. High concentrations of 130 μm MPs significantly reduced soil pH, total dissolved nitrogen (TDN), AP and AK content, but significantly increased soil Res rate. Overall, soil ecosystem function was significantly reduced by the addition of MPs. The Res rate, soil AP and DRP content and Glu activity were the most important predictors of soil ecosystem function. We found that the risk posed by MPs to soil ecosystem function was dose-dependent and size-dependent. These findings underscore that MPs can alter soil functions related to soil nutrient cycling and provide further insights into MPs behavior in agroecosystems.

Temperature and chain length play significant roles in determining the physical properties of polymer melts. In the current computational research, a molecular dynamics (MD) approach was implemented to describe the static and dynamic properties of (1) high-density polyethylene-1-butene with 120 beads in backbone (PE120) and (2) entangled high-density polyethylene-1-butene with 600 beads in the backbone (PE600). The transferable potentials for phase equilibria force fields were used for CH2 beads in a defined initial condition. First, the equilibrium phase of the designed systems was reported with total energy and density convergency at various initial temperatures (T 0 = 450, 470, and 490 K). Also, gyration radius (R g) and end-to-end distance (R) were calculated for the static behavior description of the two PEs. Zero-shear viscosity (η 0), mean square displacement, and diffusion coefficient (D) were estimated to define the dynamic behavior of PE120 and PE600 systems. MD outputs predicted that 10 ns is sufficient for equilibrium phase detection inside polymeric samples. After equilibrium phase detection, R g converged to 14.97 and 17.35 Å in PE120 and PE600, respectively (T 0 = 450 K). Furthermore, MD outputs show that temperature variation can considerably affect the time evolution of the system. Numerically, the η 0 of PE120 and PE600 converged to 49 and 168 cp at 450 K. These results of η 0 parameter as a function of temperature are an important output of MD simulations. The results predicted that η 0 decreases to 24 and 44 cp for PE120 and PE600 samples with an increase in temperature from 450 to 490 K. With the creation of the entanglements network, D reached the highest value of 2 × 10−9 m2·s−1 among the designed polymeric systems. The results are in good consistency with experimental reports. It is expected that the result of this study can be used in designing improved polymeric systems for real applications.

AIM: To compare the exposure rate, infection rate, percentage of enhancement, and success rate between Medpor and the three-dimensional printed polyethylene (3DP-PE) orbital implant in a preliminary report. METHODS: This prospective, randomized, equivalence, controlled trial was conducted at two institutes. The equivalent margin was ±10%. The sample size for the equivalence trial was 174 participants per group. Patients who were eligible for enucleations received either Medpor or 3DP-PE implants based on a randomized block of six. The surgeries were performed by five oculoplastic surgeons. The assessor and patients were masked. The magnetic resonance imaging (MRI) of the orbit was performed at least 6mo after operation and the fibrovascular ingrowth was analyzed using the Image J software. Follow-up continued at least 1y after surgery. The intention to treat and per protocol approaches were used. RESULTS: Totally 128 patients met the criteria in the report. Fifty Medpor and 55 3DP-PE cases completed the trial. The most common cause of blindness was trauma. The mean follow-up times of Medpor and 3DP-PE were 33 and 40mo respectively. The exposure rate was not statistically significant between two groups (6.0% and 7.3%), P

Introduction: With the increasing demand for aesthetics, the popularity of Vacuum-formed Retainers (VFRs) has been on the rise. Bisphenol-A (BPA) is added to the polymers to make them clear and tough. BPA is identified as an endocrine disruptor linked to developmental defects, infertility, cardiovascular disease and cancer. The release of BPA from various orthodontic materials, including VFRs, has been reported infrequently and with variable results. Aim: To assess the effect of immersing VFRs in distilled water on BPA release in the saliva of patients wearing VFRs. Materials and Methods: This was a single-centre prospective randomised clinical trial. A total of 28 patients aged between 15 and 25 years, who had completed their fixed orthodontic treatment in 2021 at Bharati Vidyapeeth Deemed to be University (BVDU), Dental College and Hospital, Sangli, Maharashtra, India, were selected for this in-vivo study. Patients were randomly divided into two groups. Group I patients received VFRs without immersion in water before delivery, while Group II patients received VFRs that were immersed in distilled water at 37˚C for 24 hours before delivery. Four samples of unstimulated whole saliva were collected across four different time intervals: T0 (before VFR delivery), T1 (after one hour of wearing retainers), T2 (after one week of wearing retainers) and T3 (after three weeks of wearing retainers). These samples were tested for BPA release using HPLC analysis. For numerical continuous data following a normal distribution, intergroup comparison was conducted using a one-way Analysis of Variance (ANOVA) test and intra-group comparisons were performed using a paired t-test. An alpha error of 5% and a power of 80% were maintained, with p

Abstract The present Bayesian network meta-analysis compared different types of polyethylene liners in total hip arthroplasty (THA) in terms of wear penetration (mm/year) and rate of revision. The type of liners compared were the crosslinked ultra-high molecular weight polyethylene (CPE/UHMWPE), Vitamin E infused highly cross-linked polyethylene (HXLPE-VEPE), modified cross-linked polyethylene (MXLPE), highly cross-linked polyethylene (HXLPE), Cross-linked polyethylene (XLPE). This study was conducted according to the PRISMA extension statement for reporting systematic reviews incorporating network meta-analyses of healthcare interventions. In June 2024, PubMed, Scopus, Embase, Google Scholar, and Cochrane databases were accessed. A time constraint was set from January 2000. All investigations which compared two or more types of polyethylene liners for THA were accessed. Only studies that clearly stated the nature of the liner were included. Data from 60 studies (37,352 THAs) were collected. 56% of patients were women. The mean age of patients was 60.0 ± 6.6 years, the mean BMI was 27.5 ± 2.0 kg/m2. The mean length of follow-up was 81.6 ± 44.4 months. Comparability was found at baseline between groups. XLPE and HXLPE liners in THA are associated with the lowest wear penetration (mm/year) and the lowest revision rate at approximately 7 years of follow-up.

Plastic Recycling Facilities (PRF) are one of microplastic sources that may release into the environment. This study aims to identify the abundance and characteristics of microplastics potentially released from a PRF in Indonesia. Analysis of raw materials in the influent of the Wastewater Treatment Plant (WWTP) showed a microplastic abundance of 485 particles/L. The dominant type of microplastic was the 2.5 µm–5 mm size of fragmented high-density polyethylene (HDPE). In the effluent of floating clarifier 3, the microplastic abundance detected was 98 particles/L, with low-density Polyethylene (LDPE) as the dominant fragmented plastic ranging from 1.2 µm–2.5 µm. Meanwhile, in the WWTP sludge, microplastics were identified with an abundance of 364.81 particles/kg. The microplastics found in the sludge were predominantly in the fragment form, composed of HDPE, with sizes ranging from 0.2 µm–2.5 µm. This information is crucial for understanding the extent to which PRFs contribute to microplastic pollution in the environment. These findings emphasize the importance of implementing more effective wastewater management technologies in PRFs to reduce the release of microplastics into the environment.

Polyethylene (PE) is the most widely produced synthetic polymer and the most abundant plastic waste worldwide due to its recalcitrance to biodegradation and low recycle rate. Microbial degradation of PE has been reported, but the underlying mechanisms are poorly understood. Here, we isolated a Rhodococcus strain A34 from 609 day enriched cultures derived from naturally weathered plastic waste and identified the potential key PE degradation enzymes. After 30 days incubation with A34, 1% weight loss was achieved. Decreased PE molecular weight, appearance of C-O and C═O on PE, palmitic acid in the culture supernatant, and pits on the PE surface were observed. Proteomics analysis identified multiple key PE oxidation and depolymerization enzymes including one multicopper oxidase, one lipase, six esterase, and a few lipid transporters. Network analysis of proteomics data demonstrated the close relationships between PE degradation and metabolisms of phenylacetate, amino acids, secondary metabolites, and tricarboxylic acid cycles. The metabolic roadmap generated here provides critical insights for optimization of plastic degradation condition and assembly of artificial microbial communities for efficient plastic degradation.

Post-industrial low-density and linear low-density polyethylene blown films are mechanically recycled for reutilizing in the production of blown films for packaging applications. This process enables the production of films with lower cost and similar properties while preserving the environment and lowering the amount of waste material disposed of. The mechanical recycling process results in the production of recycled pellets. This process includes chopping, washing, drying, and reprocessing. Mixtures of these recycled materials and their virgin form with various concentrations are shaped into blown films with inherent 70 and 30 wt% loadings for low-density polyethylene and linear low-density polyethylene components, respectively. Fourier transform infrared spectroscopy results of the recycled material show no contamination or chemical reaction with other materials. Gel permeation chromatography is carried out on the virgin and recycled low-density polyethylene and linear low-density polyethylene, and the results indicate the occurrence of chain session and crosslinking during the recycling process. The decline in the thermal properties of the samples, seen from the differential scanning calorimetry results, indicates the presence of crosslinks. The effect of structural changes caused by the recycling process on the rheological properties is studied. The miscibility of the blend components is evaluated by Cole-Cole plots and then further proved by Han and Van Gurp-Palman curves. Mechanical properties display an upturn following the presence of the crosslinkes. A decline in the optical properties in the films caused by the refraction of light by the crosslink structure in the film bulk and on the surface is evident. Highlights * LDPE and LLDPE were recycled according to the circular economy approach * Blown films containing virgin and recycled LDPE and LLDPE were produced * Chain scission and crosslinking as a result of recycling were studied * Rheological, thermal, mechanical, and optical properties were studied KEYWORDS circular economy, crosslinking, mechanical properties, polyethylene, recycling, rheological properties, 1 | INTRODUCTION The vast applicability of plastics due to their lightweight and ease of processing, along with other desirable features like high strength and sensible prices, has made them [...]

Foaming processes for polymeric materials are usually carried out using extrusion and injection methods. This applies primarily to products whose wall thickness is at least 4 mm. The main advantage of using this type of modification is the continuity of the film, without holes and depressions on the surface and a reduction in the density of the product. Foaming of plastics using the blown extrusion process, where we obtain thin-walled products in the form of film, involves the risk of loss of it continuity. Additionally, as a result of modification with blowing agents, the obtained film is porous throughout its cross-section, which causes surface irregularities that affect its tribological properties. The article presents the results of research on selected mechanical and tribological properties and structure of microporous films obtained in the blown extrusion process. The tests showed the influence of the blowing agent used on the tested properties and structure of the film.

The article presents the results of experimental studies on selected, mechanical properties of three-layer film, produced by blown film extrusion. Three-layer film was developed for making garbage bags. The research was carried out under industrial conditions. The three-layer film sleeves tested were made of low and high density polyethylene and differed in raw material composition, including a different content of recycled polyethylene in individual film layers. Static tensile strength, tear strength and puncture strength tests were carried out using the dart drop method. On the basis of the results obtained, the impact of the content of polyethylene regranulate on the composition of the raw material of the multilayer film in the above-mentioned selected mechanical properties was assessed, in relation to the expected values of these parameters, ensuring the correct use of the three-layer film in the production process and obtaining a garbage bag with appropriate utility features.

Polyethylene (PE) foams are widely used for the advantages of light weight and reducing energy consumption. So, the preparation of environmental friendly and efficient blowing agent is essential. The use of supercritical carbon dioxide (CO2) as physical blowing agent requires harsh experimental conditions such as high‐pressure and temperature. In this study, CO2 was captured by 1, 2‐cyclohexanediamine (TRK) under atmospheric pressure, and reversibly released under heating as a blowing agent with nanosponges (NS) used as the carrier (NS:TRK‐CO2). Furthermore, three ethoxy silane coupling agents were selected to improve the compatibility between heterogeneous nucleating agent (cyclodextrin nanosponges, NS) and PE, so as to improve the nucleation effect of NS and the comprehensive properties of PE composites. Analyses showed that triethoxyvinyl silane (VTES) was a suitable candidate for improving the compatibility of NS and PE. The addition of NS:TRK‐CO2@VTES not only improved the crystallization performance, but also improved the complex viscosity and storage modulus, and enhanced the thermal properties of PE composites. The optimal cell morphology was obtained by introduction of NS:TRK‐CO2@VTES with 5 wt%, the minimum cell diameter was 50 μm, and the maximum cell density was 9.4 × 104 cells/cm3. Compared with the other PE composites, PE/NS:TRK‐CO2@VTES composites showed excellent mechanical, thermal, and sound insulation properties. The maximum impact strength was 7.62 KJ/m2, which was two times higher than pure PE. The thermal conductivity was 0.054 W/m k, the sound absorption coefficient was 0.836 at 1500 Hz. [ABSTRACT FROM AUTHOR]

Twenty types of polyethylene (PE) including high density polyethylene (HDPE) and linear low‐density polyethylene (LLDPE) with various viscosity were used to study the in‐situ formation of PE‐ ethylene propylene rubber (EPR) core‐shell rubber particles (CSRP) in polypropylene (PP) matrix by melt blending. The results show that PE and EPR cannot form CSRP if PE melt flow index (MFI) is lower than about 0.3 g/10 min. As a result, the impact fracture of PP/PE/EPR composite is brittle. If PE MFI is higher than 0.3 g/10 min, PE and EPR can form CSRP, leading to the ductile impact fracture of PP/PE/EPR composite. Interestingly, upper limit content of PE for the formation of CSRP depends on the type and viscosity of PE. For HDPE, upper limit content of PE tends to increase with the increase of its MFI, whereas it drops considerably for LLDPE. Understanding these relationships provides insights into optimizing the selection of core types and viscosity for enhancing the mechanical properties of polymer composites with core‐shell structure. This may potentially guide the development of cost‐effective and high‐performance polymer composites. [ABSTRACT FROM AUTHOR]

Shape memory polymers typically utilize the glass transition or melting temperature to switch from one shape to another. The goal of this work is to check if the α‐relaxation, which is attributed to the migration of chains through lamellar crystals, can be utilized as novel switch for any crosslinkable semi‐crystalline thermoplastic. Using cross‐linked low‐density polyethylene (x‐LDPE) as an example, it is shown that the α‐relaxation is indeed suitable as switch, when the polymer is crystallized under strain to an intermediate shape. It is demonstrated that post‐stretching at a temperature between the α‐relaxation and the melting temperature, followed by subsequent cooling to room‐temperature switches x‐LDPE from the intermediate to a temporary shape and that reheating to this temperature initiates the retraction back to the intermediate shape. Switching between intermediate and temporary shapes is shown to be accompanied by a reversible change in morphology. [ABSTRACT FROM AUTHOR]

Microplastics are emerging pollutants that cause health problems for aquatic organisms. Fish is one of the important organisms because of its consumption by humankind. The present study examines the abundance and prevalence of microplastics in freshwater fish species through a systematic review study while considering five important factors, i.e. water resources, habitat, feeding behavior, Fulton's condition factor, and microplastic characteristics. A comprehensive meta-analysis was undertaken to evaluate relevant publications in terms of microplastic abundance. Articles published up to July 30, 2022 were found through Global search engines including, Web of Science, Scopus, and PubMed. In total, 786 articles were found that 53 and 42 articles were used for qualitative review and meta-analysis, respectively. This was carried out by a random-effects model with high heterogeneity (I2 = 99.76%). According to the data, the highest attention in microplastic research in body part and water sources are related to gastrointestinal tract (n = 259 (~ 80%)) and rivers (n = 189 (~ 58%)), respectively. According to the results, the average microplastic prevalence range was 5 -100%, and microplastic abundance was within the 0.04–204 items range per individual. The difference between microplastic prevalence and abundance for the key factors for parametric and nonparametric data were analyzed using Analysis of variance (ANOVA) and the Kruskal-Wallis test, respectively. According to the Baujat plot, two studies (ID: 27 and 25) revealed the minimal influence of microplastics abundance. Conclusively, the average microplastics abundance according to the pooled data, varied between 2.23 and 2.48, with a mean of 2.35 items per individual in the studies overall. It is concluded that the amount of ingested microplastics by fish is related only to physiology (height, weight, and body structure) but not feeding behavior, habitat, and surrounding water. [ABSTRACT FROM AUTHOR]

The internal energy, U, enthalpy, H, Helmholtz free energy, A, and Gibbs free energy, G, for the isothermal, isobaric, isochoric and isoentropic ensembles for polyethylene (PE) have been determined over a range of temperature, including the zero Kelvin, using the intrinsic equation of states based on the pressure-volume-temperature-entropy equations of state, P-V-T-S Eos determined in our previous reports. Each energy function was separated into its two parts; the energy = (the energy- the energy (0 K)) and the energy (0 K) where the energy (0 K) is the energy at the zero Kelvin. The energy (0 K) was much larger than the former, (the energy- the energy (0 K)), for the internal energy in the isobaric ensemble, the enthalpy in the isothermal, isochoric and isoentropic ensembles and the Gibbs free energy in the isothermal, isochoric and isoentropic ensembles, while the energy (0 K) was negligibly small for the internal energy in the isothermal ensemble and the Helmholtz free energy in the isothermal and isoentropic ensembles. The energy derivatives intrinsic to each ensemble, such as ( ∂ U ∂ T ) P , ( ∂ H ∂ T ) V , ( ∂ A ∂ V ) S , ( ∂ G ∂ P ) S , were evaluated where the subscripts, P, V, S, mean the isobaric, the isochoric and the isoentropic ensembles, respectively. [ABSTRACT FROM AUTHOR]

After clinical introduction in 2005, sequentially annealed, highly cross-linked polyethylene (SA HXLPE) was studied for retrievals with short implantation times; however, long-term follow-ups are lacking. The objective of this study was to examine and compare the revision reasons, damage mechanisms, and oxidation indices of SA HXLPE and conventional gamma inert–sterilized (Gamma Inert) ultra-high-molecular-weight polyethylene tibial inserts implanted for >5 years. There were 74 total knee arthroplasty tibial inserts (46 SA HXLPEs, 28 Gamma Inerts) implanted for >5 years (mean 7 ± 2 years) retrieved as part of a multicenter retrieval program. Cruciate-retaining implants comprised 44% of the SA HXLPEs and 14% of the Gamma Inerts. Patient factors and revision reasons were collected from revision operating notes. A semiquantitative scoring method was used to assess surface damage mechanisms. Oxidation was measured using Fourier transform infrared microscopy according to American Society for Testing and Materials 2102. Differences between cohorts were assessed with Mann–Whitney U -tests. Loosening (Gamma Inert: 17 of 28, SA HXLPE: 15 of 46) and instability (Gamma Inert: 6 of 28, SA HXLPE: 15 of 46) were the most common revision reasons for both cohorts. The most prevalent surface damage mechanisms were burnishing, pitting, and scratching, with burnishing of the condyles being higher in Gamma Inert components (P =.022). Mean oxidation was higher in the SA HXLPE inserts at the articulating surface (P =.002) and anterior-posterior faces (P =.023). No difference was observed at the backside surface (P =.060). Revision reasons and surface damage mechanisms were comparable in the Gamma Inert and SA cohorts. Further studies are needed to continue to assess the in vivo damage and clinical relevance, if any, of oxidation in SA HXLPE over longer implantation times, particularly for implants implanted for more than 10 years. [ABSTRACT FROM AUTHOR]

This paper describes the effect of two different fillers derived from giant reed (Arundo donax L.), namely fibers and shredded aerial parts of the plant, on the thermal properties of polyethylene-based composites, as the analysis of dimensional stability of lignocellulose-based composites, and its relationship with their thermal diffusivity, has not yet been assessed in the literature. It has been found that the introduction of such materials resulted in a significant reduction of the coefficient of thermal expansion, particularly more important in the case of fibers, due to their higher aspect ratio; in particular, this coefficient is reduced to less than half for fibrous composites (from 1.6·10− 4 K− 1 to 6.1·10− 5 K− 1 or 3.5·10− 5 K− 1 for 20 and 40% loadings). This parameter also influences the thermal diffusivity of the final parts; the diffusivity of composites increases with the ratio of lignocellulosic filler used, particularly when using fibers, due to a better orientation of these fibers than the shredded material, which does not exhibit a fibrous shape. Composites with 20% share of the filler exhibited a thermal diffusivity increased by about 15% compared to neat polyethylene, while 40% loadings resulted in a 25% and 60% increase for ground and fibrous materials, respectively. These results provide additional features to lignocellulose-composites characterization, providing properties not usually mentioned in the literature to expand the knowledge about such composite materials beyond mechanical properties, providing a broader range of properties to offer a wider application area of such composites. Statement of Novelty Arundo donax L. is of great interest to biorefineries due to its fast growth and resistance to adverse environmental conditions. Most research on this plant species focuses on obtaining energy products or valuable chemicals, while very few are related to composite production, particularly on thermoplastic materials. The work found in the literature so far does not provide insights into the relationships between the types of filler (and their aspect ratio) and their thermal properties. Therefore, this work expands the knowledge on the thermal behavior of lignocellulose-polymer composites, supplementing the research, usually focused only on mechanical properties, in their characterization by correlative analysis of thermal influenced dimensional change with structure and thermal diffusivity. Determining the coefficient of thermal expansion (CTE) is a relevant parameter to assess the possibilities of using a material at high or low temperatures and evaluate the dimensional stability of a product during its service lifetime. On the other hand, thermal diffusivity brings together the capacity of a material to store thermal energy and distribute it throughout the material; that is, it relates heat capacity and thermal conductivity, which are also essential in using materials in market applications. Therefore, the work not only provides the results of thermal diffusivity and CTE of thermoplastic-reed composites but also correlates both parameters as a way to widen the range of application of plant-based composites in areas where dimensional stability (i.e., low thermal expansion) is required. [ABSTRACT FROM AUTHOR]

Plastic waste management is a complex problem that has negative effects on the environment, society, and the economy. The development of science has made humanity use plastic materials a lot, and because it does not cost to manufacture and is recyclable, it is used in most industries. Plastic contains polyethylene, most of it does not biodegrade and remains in the environment for long periods, and its abundant accumulation leads to many environmental and health hazards to humans. This research, which aims to recycle plastic bags in the field of construction, is of utmost importance in addressing the pressing issue of plastic waste management. The plastic will likely increase the durability of structures mechanically and increase thermal insulation. In this research, the plastic bag segments are integrated in a ratio of 0% to 0.7% in the compressed clay bricks. Which consists of sand, clay, and gypsum. Some physical, mechanical, and thermal properties of the samples are measured. Preliminary results show that the addition of these strips reduces the value of the bulk density between 3.21% to 13%. The speed of sound transmission also decreases between 2.17% and 21%. The stress strength increases between 5.4% to 25.53%. The thermal conductivity value also decreases between 5.26% to 23.68%. This leads to the clay brick becoming lighter, more solid, and better thermal insulation. Thus, we combine the improvement of the properties of clay structures with a significant reduction in environmental impact, inspiring a more sustainable future. [ABSTRACT FROM AUTHOR]

Background: The effectiveness of newly developed elastomeric polymer hybrid siloxane (PVES), which combines the properties of polyethylene (PE) and polyvinyl siloxane (PVS) elastomers, has been a subject of interest in recent studies. This study aimed to assess the physical properties of hybrid PVES materials by analyzing existing data from recent studies on this topic. Methods: A systematic literature search was conducted to retrieve peer-reviewed articles published up to February 5, 2023. The population, intervention, comparison, and pertinent outcomes were specified under the PICO framework. The primary data analysis was performed in Microsoft Excel, while statistical analysis used Meta-Essentials. Results: Of the 1152 articles assessed, 14 met the inclusion criteria. The meta-analysis of the selected studies indicated that polyether (PE) and polyvinyl siloxane (PVS) were highly correlated (two-tailed p-values of 0.000 and 0.001, respectively) with the improved tensile strength of vinyl polyether siloxane (PVES) with a significantly positive effect size. Similarly, the hydrophilic characteristics of PVES were significantly improved compared to those of PE and PVS. PE was a significant contributor to the hydrophilic characteristics of PVES, with a two-tailed p-value of 0.000. The effect size was highly positive for hydrophilicity but showed high heterogeneity. It was also observed that the dimensional accuracy of PVES was comparable to those of PE and PVS, with no statistically significant differences among the three materials. Conclusions: PVES showed promising features, with improved tensile strength and hydrophilic characteristics compared to those of PE and PVS. [ABSTRACT FROM AUTHOR]

Under varying flow rate conditions, the transport and retention of polydisperse microplastics (MPls), with an average particle size of 16 ± 6 µm, were investigated in saturated porous media. First-order reversible and irreversible kinetic sorption models were used to describe the sorption kinetics. Sensitivity analyses provided insight into the effects of each sorption parameter. Both numerical modeling and experimental measurements were utilized to evaluate the retention rates of sand filters. The influence of flow rate on sorption was reflected in variations in the distribution coefficient (Kd), the mass transfer coefficient (β), and the irreversible sorption rate (K1). Lower flow rates were associated with higher Kd and β values, indicating increased sorption and reduced mass transfer rates. An increase in Kd resulted in a more gradual sorption process, with a decrease in peak concentration, whereas changes in β had a comparatively smaller impact on sorption rate and peak concentration. Lower K1 values were linked to higher peak concentrations and decreased retention efficiency. Numerical modeling revealed retention rates of 28 ± 1% at a flow rate of 31 mL min−1 and 17 ± 1% at 65 mL min−1. The introduction of MPls into saturated sand environments modifies the transport dynamics within the medium. Consequently, these alterations affect the hydrological characteristics of porous media, impacting groundwater quality and agricultural output. The mean absolute error (MAE) of 6% between the modeled and observed retention rates indicated a high level of accuracy. This study underscores the importance of examining retention efficiency and the accuracy of numerical models in understanding MPl transport in porous media.

Aims: Implant waste during total hip arthroplasty (THA) represents a significant cost to the USA healthcare system. While studies have explored methods to improve THA cost-effectiveness, the literature comparing the proportions of implant waste by intraoperative technology used during THA is limited. The aims of this study were to: 1) examine whether the use of enabling technologies during THA results in a smaller proportion of wasted implants compared to navigation-guided and conventional manual THA; 2) determine the proportion of wasted implants by implant type; and 3) examine the effects of surgeon experience on rates of implant waste by technology used. Methods: We identified 104,420 implants either implanted or wasted during 18,329 primary THAs performed on 16,724 patients between January 2018 and June 2022 at our institution. THAs were separated by technology used: robotic-assisted (n = 4,171), imageless navigation (n = 6,887), and manual (n = 7,721). The primary outcome of interest was the rate of implant waste during primary THA. Results: Robotic-assisted THA resulted in a lower proportion (1.5%) of implant waste compared to navigation-guided THA (2.0%) and manual THA (1.9%) (all p < 0.001). Both navigated and manual THA were more likely to waste acetabular shells (odds ratio (OR) 4.5 vs 3.1) and polyethylene liners (OR 2.2 vs 2.0) compared to robotic-assisted THA after adjusting for demographic and perioperative factors, such as surgeon experience (p < 0.001). While implant waste decreased with increasing experience for procedures performed manually (p < 0.001) or with navigation (p < 0.001), waste rates for robotic-assisted THA did not differ based on surgical experience. Conclusion: Robotic-assisted THAs wasted a smaller proportion of acetabular shells and polyethylene liners than navigation-guided and manual THAs. Individual implant waste rates vary depending on the type of technology used intraoperatively. Future studies on implant waste during THA should examine reasons for non-implantation in order to better understand and develop methods for cost-saving. Cite this article: Bone Jt Open 2024;5(8):715–720.

Abstract Background Modular acetabular components for total hip arthroplasty (THA) provide intraoperative flexibility; however, polyethylene liner dissociation may occur. This study aimed to examine the incidence and causes of liner dissociation associated with a specific acetabular component design at a single centre. Materials and methods A retrospective analysis of 7027 patients who underwent primary THA was performed to identify isolated liner dislocations. Patient demographics, clinical presentations, surgical and implant details, and both radiographic and computed tomography (CT) findings were analysed. Patients with liner dislocation were matched to a control group via 2:1 propensity score matching, and a logistic regression analysis was employed to identify associated risk factors. Results A total of 32 patients (0.45%) experienced liner dislocation at a mean 71.47 ± 60.10 months post surgery. Significant factors contributing to dislocations included the use of a conventional compared with a highly crosslinked polyethylene component (p = 0.049) and screw fixation (p = 0.028). Radiographic and CT analysis highlighted the importance of proper component orientation, revealing that patients experiencing dislocations demonstrated significantly lower acetabular cup anteversion angles (p = 0.001) compared with the control group. Impingement and malposition, identified in 41% and 47% of the cases, respectively, further underscored the multifactorial nature of dislocation risks. Conclusions While the overall rate of polyethylene liner dislocation was low, the findings of this study highlight the importance of appropriate cup placement to decrease the risk of dissociation. It further substantiates the influence of impingement and malposition in liner displacement, with increased mechanical stress exerted on the locking mechanism under adverse conditions and the potential risk increase due to screw placement.