Article
Engineering, Mechanical
Manuel Evaristo, Filipe Fernandes, Albano Cavaleiro
Summary: The tribological behavior of DLC coatings alloyed with different elements was evaluated. Pure DLC and DLC-W showed the best wear resistance, while DLCSi and DLCSiO demonstrated the lowest friction coefficient. The increase of temperature significantly increased the friction coefficient for DLC and DLC-W coatings, while a slight decrease was noticed for DLC-Ag, DLC-Si, and DLC-SiO coatings.
Article
Multidisciplinary Sciences
Shinya Hayashi, Shingo Hashimoto, Yuichi Kuroda, Naoki Nakano, Tomoyuki Matsumoto, Kazunari Ishida, Nao Shibanuma, Tomoyuki Kamenaga, Ryosuke Kuroda
Summary: This study retrospectively analyzed 115 patients who underwent robot-assisted total hip arthroplasty to investigate the accuracy of cup placement and predictive risk factors for inaccurate cup positioning. The results showed that a posterior pelvic tilt and anterior surgical approach were significant predictive factors for inaccurate cup positioning in robot-assisted THA.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Biomedical
Susann Wolf, Anne Christine Johannessen, Peter Ellison, Ove Furnes, Geir Hallan, Katharina Rogg, Kathrine Skarstein, Paul Johan Hol
Summary: The combination of cemented Spectron EF stem and cemented non-crosslinked Reflection All-Poly cup has a high rate of mid-term aseptic loosening. The study assessed tissue reactions, wear particles, and blood metal ion levels in patients with failed implants. The results showed a significant presence of inflammatory cells and wear particles, with severe stem abrasion. These factors contribute to osteolysis and implant loosening.
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Junzhe Wu, Dominic Taylor, Raimund Forst, Frank Seehaus
Summary: The study demonstrated that the 3D(wear) approach is more accurate and precise than the 2D(wear) approach, and is more stable in the face of pelvic position changes. However, the 2D(wear) approach may still be a viable alternative if the wear range is between 100-500 micrometers and suitable X-ray images are available.
APPLIED SCIENCES-BASEL
(2021)
Article
Automation & Control Systems
Max Boehnke, Moritz Rossel, Christian R. Bielak, Mathias Bobbert, Gerson Meschut
Summary: To predict the characteristics of clinched joints and ensure the reliability of the process, numerical simulations are used. However, the accuracy of these simulations depends highly on the implemented friction model. This study focuses on developing testing concepts to determine the friction coefficients between sheet metal materials for simulating clinching processes, in order to address the lack of testing methods that can sufficiently investigate the frictional behavior in sheet materials.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Engineering, Biomedical
Robin Layton, Neil Messenger, Todd Stewart
Summary: This paper examines the joint force characteristics of 9 activities performed by 18 normal healthy subjects. The manner in which each activity was completed varied by approximately 30% within the cohort. The average maximum load and duration of the activities differed from walking, and the findings are important for testing cartilage substitutional materials.
MEDICAL ENGINEERING & PHYSICS
(2022)
Article
Engineering, Mechanical
Diego Salvaro, Joao Marcos Warmling Dudy, Fabiana de Oliveira Palheta, Cristiano Binder, Aloisio Nelmo Klein, Guilherme Mariz de Oliveira Barra, Jose Daniel Biasoli de Mello
Summary: Improving the energy efficiency of mechanical systems and reducing the usage of lubricant oils and related additives are challenging tasks of the 21st century. The application of tribopolymers, such as PEEK, PAEK, and PTFE, is increasing due to their easy processing and lower density. This study investigates the effects of grinding processes and the incorporation of PTFE on the morphology, composition, and tribological properties of PAEK + PTFE blends.
Article
Engineering, Mechanical
Piyush Patil, Subin Lee, Gerhard Dehm, Steffen Brinckmann
Summary: This study investigates the influence of wear direction and crystal anisotropy on microstructure evolution by observing the deformation mechanisms in single grains. The results show that the extent of deformation and twin density are dependent on the wear direction and normal load. The study also provides insights into why some grains exhibit twinning while others do not under identical external loads.
Article
Engineering, Mechanical
Marco Freschi, Matteo Di Virgilio, Oskari Haiko, Marco Mariani, Luca Andena, Nora Lecis, Jukka Komi, Giovanni Dotelli
Summary: A set of self-lubricating copper-tungsten disulfide composites were prepared to analyze the effects of solid lubricant concentration on their tribological, electrical and wettability properties. The experimental results showed that a second phase content in the 10-15 wt% range could guarantee a better combination of the desired features.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
S. Shankar, R. Nithyaprakash, G. Abbas, R. Naveen Kumar, Alokesh Pramanik, Animesh Kumar Basak, Chander Prakash
Summary: This study investigated the tribological behavior of ZTA against Ti6Al4V grade 5 material. The results showed that sesame oil had the lowest friction and wear coefficient values under different loading and lubrication conditions, making it suitable as a bio-lubricant for the ZTA-Ti6Al4V combination.
Article
Engineering, Biomedical
Therese Bormann, Simeon Kraenzler, Sebastian Jaeger, Daniel Kluess, Wolfram Mittelmeier, Tobias Renkawitz, J. Philippe Kretzer
Summary: By studying 37 retrieved femoral components, it was found that the stability of the coating is not related to patient body weight or activity level. However, TiNbN coatings showed the highest wear, indicating the need for further improvement in their wear resistance.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
Article
Chemistry, Physical
Jian Su, Jian-Jun Wang, Shi-Tong Yan, Min Zhang, Hui-Zhi Wang, Ning-Ze Zhang, Yi-Chao Luan, Cheng-Kung Cheng
Summary: This study compared the wear rate between different friction pairs using a hip joint simulator and recommended a suitable prosthesis combination based on processing technology and cost, finding that a CoCrMo femoral head with an accompanying XLPE liner is the most suitable choice for hip prostheses in terms of wear rate and cost-effectiveness.
Article
Multidisciplinary Sciences
Philipp Damm, Alwina Bender, Vivian Waldheim, Tobias Winkler, Georg N. Duda
Summary: This study investigates the factors affecting joint friction and temperature increase in patients with THA through a combination of in vivo and in silico technologies. The results highlight the significance of implant orientation, joint kinematics, and friction-induced temperature increase, emphasizing the importance of cup placement during surgery.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Biomedical
K. Nitish Prasad, P. Ramkumar
Summary: Hard-on-Hard hip implants, specifically ceramic tribo-pair, have shown excellent properties such as high wear resistance, biocompatibility, corrosion resistance, and fracture toughness. However, the ceramic tribo-pair is prone to edge loading, leading to increased wear and early implant failures. In this study, a new Finite Element Method (FEM) model is developed to accurately predict wear in ceramic hip replacement bearings under dynamic edge loading conditions. The model is validated with hip simulator data and achieves over 98% accuracy in wear depth and volumetric wear rate prediction. The model can predict wear under standard and dynamic edge loading conditions.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
Article
Orthopedics
Douglas A. Dennis, Gerard H. Smith, Jessica L. H. Phillips, Hayley E. Ennis, Jason M. Jennings, Christopher Plaskos, Jim W. Pierrepont
Summary: This study evaluated spinopelvic mobility in 78 total hip arthroplasty (THA) patients and found that individualized cup position reduced prosthetic impingement, while bone impingement was present in all groups and not affected by cup position. Risk factors associated with prosthetic impingement included age, lumbar flexion, and pelvic tilt. Therefore, individualized cup position can decrease the risk of prosthetic impingement.
JOURNAL OF ARTHROPLASTY
(2023)
Review
Orthopedics
Michelle E. Casper-Taylor, Andrew J. Barr, Sophie Williams, Ruth K. Wilcox, Philip G. Conaghan
JOURNAL OF ORTHOPAEDIC RESEARCH
(2020)
Article
Engineering, Biomedical
Philippa Bowland, Raelene M. Cowie, Eileen Ingham, John Fisher, Louise M. Jennings
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE
(2020)
Article
Multidisciplinary Sciences
Aiqin Liu, William J. Sanderson, Eileen Ingham, John Fisher, Louise M. Jennings
Article
Cell & Tissue Engineering
Halina T. Norbertczak, Eileen Ingham, Hazel L. Fermor, Ruth K. Wilcox
TISSUE ENGINEERING PART C-METHODS
(2020)
Article
Biotechnology & Applied Microbiology
Reem El-Gendy, Sarah Junaid, Stephen K. L. Lam, Karen M. Elson, Joanne L. Tipper, Richard M. Hall, Eileen Ingham, Jennifer Kirkham
Summary: This study established a porcine tooth in situ organ culture system successfully maintained over 4 days in vitro. The viability, maintenance of structure, and sterility of the model were confirmed through various assays and analysis methods, demonstrating its potential for future research in periodontal regeneration.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2021)
Article
Orthopedics
Paul N. Karayiannis, Roslyn S. Cassidy, Graham Isaac, Ioan Hughes, Janet C. Hill, Alain Machenaud, David E. Beverland
Summary: This study proposed a method of classification for radiolucent lines in cementless total hip arthroplasty and identified risk factors, with non-cross-linked polyethylene, collarless stem design, undersizing, and male sex being significant factors associated with significant radiolucent lines. Increasing age at operation decreased the likelihood of significant radiolucent lines, and patients with significant radiolucent lines had higher pain scores. Overall, this classification was associated with specific risk factors and clinical outcomes.
JOURNAL OF ARTHROPLASTY
(2021)
Article
Engineering, Biomedical
Ashley Ward, Debora Morgante, John Fisher, Eileen Ingham, Jennifer Southgate
Summary: Bladder acellular matrix has potential applications in reconstructive surgeries, but the decellularization process is complex. This study used a mechanical engineering approach to design a laser-printed flat-bed apparatus for reproducible and full-thickness bladder tissue decellularization.
BIOMEDICAL MATERIALS
(2021)
Article
Engineering, Biomedical
Gregory M. Pryce, Bismaya Sabu, Mazen Al-Hajjar, Ruth K. Wilcox, Jonathan Thompson, Graham H. Isaac, Tim Board, Sophie Williams
Summary: Total Hip Arthroplasty (THA) is a common and successful surgical intervention with high survivorship at 10 years. However, there is a higher incidence of revision in the first year following the procedure, mainly due to dislocation and subluxation. This study developed a model to predict bone and component impingement for various acetabular cup positions and daily activities, suggesting ways to reduce the occurrence of dislocations.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE
(2022)
Article
Engineering, Biomedical
Ashley A. Stratton-Powell, Sophie Williams, Joanne L. Tipper, Anthony C. Redmond, Claire L. Brockett
Summary: Submicron-sized wear particles are potential causes of aseptic loosening, and highly sensitive wear particle isolation methods can identify them but not all types of particles. By modifying established techniques, high- and low-density materials can be successfully isolated from periprosthetic tissue samples.
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS
(2022)
Article
Multidisciplinary Sciences
David Jimenez-Cruz, Mudit Dubey, Tim Board, Sophie Williams
Summary: Different hip pathologies can cause geometric variation of the acetabulum and femoral head, potentially leading to joint degradation. A reliable in-vitro simulation methodology was developed to assess the effect of loading on a natural hip joint. The results showed that overload conditions resulted in various degrees of damage to the hip joint tissue.
Article
Engineering, Biomedical
Ashley A. Stratton-Powell, Sophie Williams, Joanne L. Tipper, Anthony C. Redmond, Claire L. Brockett
Summary: Aseptic loosening and osteolysis remain challenges for total ankle replacement devices. The chemical composition, size, and morphology of wear particles surrounding failed TARs were investigated in this study. Six different materials, including UHMWPE, calcium phosphate, cobalt chromium alloy, commercially pure titanium, titanium alloy, and stainless steel, were identified in the wear particles. The presence of mixed particles suggests a complex periprosthetic environment surrounding TAR devices, which may contribute to early device failure. This study provides valuable information for testing, assessment, and improvement of next-generation ankle replacement devices.
ACTA BIOMATERIALIA
(2023)
Article
Chemistry, Analytical
Matthew Peter Shuttleworth, Oliver Vickers, Mackenzie Smeeton, Tim Board, Graham Isaac, Peter Culmer, Sophie Williams, Robert William Kay
Summary: This study reports the development, calibration, and validation of a novel inertial tracking system that mounts directly to the mobile liner of dual mobility (DM) implants, allowing monitoring of their motions under realistic operating conditions. The system demonstrated accurate orientation measurements within 1.0 degrees under ideal conditions and with a negligible drift while in vitro, submerged in lubricant, and without a line of sight.
Review
Engineering, Biomedical
O. G. Vickers, P. R. Culmer, G. H. Isaac, R. W. Kay, M. P. Shuttleworth, T. Board, S. Williams
Summary: Surgery for total hip replacement is successful but complications can arise. Smart implants are widely used in healthcare but not yet in THR. Researchers need to address challenges such as sensing methods, biocompatibility, integration, power supply, communication, and regulation for in vivo sensing within a THR.
PROGRESS IN BIOMEDICAL ENGINEERING
(2021)