Article
Engineering, Biomedical
Ulrike Mueller, Therese Bormann, Stefan Schroeder, J. Philippe Kretzer
Summary: The study found that impaction force is the most important factor in determining the strength of the taper connection, followed by the type of use and head material. While the contact situation has a slight impact on the torque-off moment, the surface topography of the stem taper plays a minor role in the strength of the taper connection.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2021)
Article
Biotechnology & Applied Microbiology
Hang Zhou, Naoto Isozaki, Kazuya Fujimoto, Ryuji Yokokawa
Summary: This study provides plausible explanations for the discrepancies in the regulation of MT flexural rigidity and develops a new method for evaluating MT rigidity. Furthermore, it reveals a new relationship between the dynamics and mechanics of MTs, where MT flexural rigidity decreases through three phases with increasing growth rate. The growth rate-dependent flexural rigidity of MTs influences pattern formation in collective motion, which is validated using machine learning.
JOURNAL OF NANOBIOTECHNOLOGY
(2021)
Article
Engineering, Biomedical
Therese Bormann, Laura Nebel, Ulrike Mueller, Phuong Thao Mai, Jens Gibmeier, Tobias Renkawitz, J. Philippe Kretzer
Summary: Corrosion at the modular taper junctions in total hip arthroplasty is clinically relevant. In vitro tribo-corrosion tests using FeCl3 and H2O2 can provide more severe and realistic testing conditions compared to pure saline or calf serum.
ACTA BIOMATERIALIA
(2022)
Article
Computer Science, Interdisciplinary Applications
Shi-Jin Feng, Ya-Qiong Wang
Summary: Using the discrete element method, this study reveals the reinforcement mechanism of geogrids by conducting direct shear tests. Optimized strategies for aperture ratios considering initial interlocking states are proposed. The results provide insights into geosynthetic optimization in the analysis and design of related engineering projects.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Manufacturing
Christin Doebberthin, Maria Herbster, Bernhard Karpuschewski
Summary: The durability of hip endoprostheses depends on various factors, including the choice of materials and the potential for micromotion at the interface, which can lead to the release of metal particles and ions. Modifications to the surface structures of the femoral stem taper through different manufacturing processes can improve the bearing area of the tapers.
CIRP JOURNAL OF MANUFACTURING SCIENCE AND TECHNOLOGY
(2021)
Article
Medicine, General & Internal
Francesco Castagnini, Barbara Bordini, Monica Cosentino, Michele Di Liddo, Giuseppe Tella, Claudio Masetti, Francesco Traina
Summary: The study investigates the impact of age and sex on femoral component choices in modular total hip arthroplasty (THA). The results show that larger stem sizes are more common in males and elder patients. Standard necks are more commonly used in males aged 40-59 and less commonly used in males aged 70 or older. Different types of neck corrections are more prevalent in specific age and sex groups.
JOURNAL OF CLINICAL MEDICINE
(2023)
Article
Physics, Applied
Li-Jun Du, Yan-Song Meng, Yu-Ling He, Jun Xie
Summary: A fine-tuning method for the spatial distributions of a mixed 3D ion system in dual RF linear Paul traps is proposed to achieve efficient sympathetic cooling, analyzed through numerical simulations. By adjusting the equivalent stiffness coefficients, the optimum efficiency of sympathetic cooling is achieved by realizing non-conforming spatial distributions of laser-cooled and sympathetically cooled ions.
MODERN PHYSICS LETTERS B
(2021)
Article
Physiology
Shu-Xing Xing, Qiang Huang, Zheng-Jiang Li, Yong-Kui Li, Zhao-Nan Ban
Summary: This study evaluated the outcomes and complications of revision total hip arthroplasty in a short-to-medium follow-up period. A total of 31 patients who underwent stem revision with a fluted, tapered modular stem were reviewed. The survival rate was 100%, and there were no re-revisions. The Harris hip score improved significantly after surgery.
FRONTIERS IN PHYSIOLOGY
(2023)
Article
Orthopedics
Francesco Castagnini, Barbara Bordini, Stefano Lucchini, Monica Cosentino, Enrico Tassinari, Francesco Traina
Summary: This study aimed to evaluate the revision strategies and outcomes for titanium neck failures. The study found that fatigue fractures were the main cause of titanium neck failures. Neck exchange surgery was feasible in most cases and achieved good outcomes at 7 years.
ARCHIVES OF ORTHOPAEDIC AND TRAUMA SURGERY
(2023)
Article
Orthopedics
Annsley Mace, Charley M. Goodwin, Jeremy L. Gilbert
Summary: This study evaluated the assembly of two types of acetabular components with different geometries under a seating load. The results showed no significant difference in liner displacement between the two groups, and both designs exhibited minimal metal ion dissolution. This study provides important clinical insights into the impact of implant design on fretting corrosion.
JOURNAL OF ORTHOPAEDIC RESEARCH
(2023)
Article
Orthopedics
C. M. Lawrie, R. L. Barrack, R. M. Nunley
Summary: The study showed that young, active patients undergoing modular DM total hip arthroplasty had favorable clinical outcomes and metal ion levels at mid-term follow-up, with excellent overall survivorship and minimal concerns regarding corrosion and metal ion release.
BONE & JOINT JOURNAL
(2021)
Article
Computer Science, Interdisciplinary Applications
Guoxian Zhang, Shu Yang, Wen Cui, Zhi Huang, Xiaogang Zhang, Yali Zhang, Junyan Li, Zhongmin Jin
Summary: This study decomposed the complex three-dimensional micromotion at the head-neck junction of modular hip prostheses and revealed the main forms of micromotion and their relationship with motion state. The findings provide design considerations for further experimental testing and facilitate the understanding of fretting mechanisms in hip prostheses.
COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING
(2023)
Article
Engineering, Biomedical
Eileen S. Cadel, L. D. Timmie Topoleski, Oleg Vesnovsky, Charles R. Anderson, Robert H. Hopper, Charles A. Engh, Matthew A. Di Prima
Summary: Corrosion and wear are commonly found at the taper-trunnion connection of modular total hip arthroplasty explanted devices. M/M modular connections exhibit more damage than C/M connections, but both are susceptible to damage. Analysis techniques show that stem trunnions have more damage than head tapers, and C/M connections have less corrosion and wear compared to M/M connections.
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS
(2022)
Article
Chemistry, Physical
Andrea Martelli, Paolo Erani, Nicola Pazzagli, Valeria Cannillo, Massimiliano Baleani
Summary: This study evaluated the damage occurring on the Ti-alloy micro-grooved 12/14 tapers of different groups of implants with non-sleeved and sleeved ceramic heads. The results show that using a sleeved ceramic head can reduce the risk of mechanically assisted crevice corrosion and does not increase the risk of revision surgery.
Article
Orthopedics
Francesco Castagnini, Monica Cosentino, Barbara Bordini, Maurizio Montalti, Federico Biondi, Cesare Faldini, Francesco Traina
Summary: This study compared the use of single-taper and dual-taper stems in patients with dysplasia and found that the dual-taper stems had higher long-term survival rates and lower rates of aseptic loosening, but had a higher risk of implant breakage.
Article
Dentistry, Oral Surgery & Medicine
C. Steffen, K. Sellenschloh, V Polster, M. Heyland, M. Vollmer, M. M. Morlock, M. Heiland, G. Huber, C. Rendenbach
JOURNAL OF STOMATOLOGY ORAL AND MAXILLOFACIAL SURGERY
(2020)
Article
Clinical Neurology
Lukas Weiser, Kay Sellenschloh, Klaus Pueschel, Michael M. Morlock, Lennart Viezens, Wolfgang Lehmann, Gerd Huber
EUROPEAN SPINE JOURNAL
(2020)
Article
Orthopedics
Dimitris Ntalos, G. Huber, K. Sellenschloh, H. Saito, K. Pueschel, M. M. Morlock, K. H. Frosch, T. O. Klatte
Summary: The study found a strong correlation between the maximum pullout strength of all-suture anchors and the adjacent cortical thickness, with at least 0.4 mm needed to withstand 200 N. In contrast, conventional anchors showed no correlation. All-suture anchors resulted in smaller bone damage and a narrower cortical defect following pullout compared to conventional anchors.
KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY
(2021)
Article
Engineering, Biomedical
Sebastian M. Zobel, Michael M. Morlock, Gerd Huber
MEDICAL ENGINEERING & PHYSICS
(2020)
Article
Orthopedics
Dario Guttowski, Valerie Polster, Gerd Huber, Michael M. Morlock, Klaus Pueschel, Jakob Nuechtern
JOURNAL OF ARTHROPLASTY
(2020)
Article
Engineering, Biomedical
Claudius Steffen, Kay Sellenschloh, Matthias Vollmer, Michael M. Morlock, Max Heiland, Gerd Huber, Carsten Rendenbach
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2020)
Article
Clinical Neurology
Lukas Weiser, Gerd Huber, Kay Sellenschloh, Klaus Pueschel, Michael M. Morlock, Lennart Viezens, Wolfgang Lehmann
Summary: The biomechanical study showed that cement augmentation significantly increased fatigue load in initially loosened pedicle screws and rescue augmented screws. Rescue augmentation led to similar or higher fatigue strengths compared to initially augmented screws. The impact of cement augmentation on fatigue strength was most significant at low bone density.
GLOBAL SPINE JOURNAL
(2021)
Article
Clinical Neurology
Marc Auerswald, Philipp Messer-Hannemann, Kay Sellenschloh, Jan Wahlefeld, Klaus Pueschel, Sven Hirschfeld Araujo, Michael M. Morlock, Arndt P. Schulz, Gerd Huber
Summary: This biomechanical study evaluated the effect of lag-screws on vertebral pincer fractures at the thoracolumbar junction. Results indicated promising outcomes, with increased bony contact in bolted specimens, potentially aiding in bony healing for these fractures.
GLOBAL SPINE JOURNAL
(2021)
Article
Clinical Neurology
Lukas Weiser, Kay Sellenschloh, Klaus Pueschel, Michael M. Morlock, Lennart Viezens, Wolfgang Lehmann, Gerd Huber
Summary: In spine surgery, inadequate anchoring of pedicle screws in vertebrae with poor bone quality is a major problem. This study aimed to evaluate whether a modified thread in the area of the pedicle could significantly improve the pedicle screw fatigue strength. Results showed that using a cortical threaded pedicle screw can provide superior fatigue load compared to a conventional pedicle screw, particularly in vertebrae with reduced bone quality.
EUROPEAN SPINE JOURNAL
(2021)
Article
Engineering, Biomedical
Gerd Huber, Michael M. Morlock
Summary: This study aimed to evaluate the impact of taper loading on modular revision stems and identify configurations less prone to failure. The findings suggest that the ideal neck segment length should be between 70 mm and 90 mm, with shorter offset and retroverted implantation reducing stress, and anteverted implantation reducing loading. Additionally, the 2-D model was inaccurate in predicting bending at the taper junction.
CLINICAL BIOMECHANICS
(2022)
Article
Clinical Neurology
Lennart Viezens, Kay Sellenschloh, Klaus Pueschel, Michael M. Morlock, Wolfgang Lehmann, Gerd Huber, Lukas Weiser
Summary: Increasing pedicle screw diameter from standard 6mm to the largest possible diameter (8-10mm) significantly improved stability and fatigue load capacity, particularly in vertebrae with lower bone density.
WORLD NEUROSURGERY
(2021)
Article
Biophysics
Sebastian M. Zobel, Miriam Ruhr, Fenna Neumann, Gerd Huber, Michael M. Morlock
Summary: Sufficient primary stability is crucial for successful osseointegration of cementless implants. This study investigated the influence of densification of cancellous bone with bone particles on the interface friction coefficient. The results showed that densification increased the friction coefficient and may improve the primary stability of uncemented implants. Optimization of particle shape and size based on individual bone microstructure could enhance frictional resistance.
JOURNAL OF BIOMECHANICS
(2022)
Article
Orthopedics
D. Dalos, G. Huber, Y. Wichern, K. Sellenschloh, K. Pueschel, K. Mader, M. M. Morlock, K. H. Frosch, T. O. Klatte
Summary: The biomechanical evaluation and analysis of tunnel widening of three different suture button devices used in acromioclavicular joint repair showed that the Low Profile AC Repair System had inferior properties compared to the AC TightRope and AC Dog Bone devices, leading to significant tunnel widening. Clinicians should carefully select the type of acromioclavicular repair device used and consider tunnel widening as a potential complication.
KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY
(2023)
Article
Orthopedics
Tobias Konow, Peter J. J. Schlieker, Frank Lampe, Benjamin Ondruschka, Michael M. M. Morlock, Gerd Huber
Summary: Aseptic loosening is a major cause of re-revisions of cementless revision stems. This study investigated how femur morphology and preparation methods affect the primary stability of revision stems and found that the individualized Dorr classification CCS and UFC can provide a good estimation of primary stability.
JOURNAL OF ORTHOPAEDIC RESEARCH
(2023)
Article
Engineering, Biomedical
Claudius Steffen, Kay Sellenschloh, Magdalena Willsch, Ana Prates Soares, Michael M. Morlock, Max Heiland, Kilian Kreutzer, Gerd Huber, Carsten Rendenbach
Summary: This study aimed to examine whether patient-specific 3D-printed miniplates provide increased interosteotomy movement (IOM) and lower stiffness compared to reconstruction plates. The findings showed that miniplate fixation resulted in higher IOM in the distal gap, while there was no significant difference between the groups in the mesial gap. Surgeons should evaluate the primary use of 3D-printed miniplates in mandibular reconstruction due to advantages of intraoral plate removal and safe osteosynthesis.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
