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
Shawn Ming Song Toh, Ariyan Ashkanfar, Russell English, Glynn Rothwell
Summary: In this study, a fretting wear algorithm was developed to investigate wear damage on bearing surfaces of THRs, predicting linear and volumetric wear rates effectively. Results showed comparable wear rates to in-vivo THRs and matched wear patterns from conventional polyethylene liners, offering potential for reducing wear rates in THR design and clinical techniques.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2021)
Article
Orthopedics
Colin P. McCarty, Sang-Hyun Park, Nathan C. Ho, Sophia N. Sangiorgio, Edward Ebramzadeh
Summary: Despite concerns about trunnionosis, this study found that high friction in metal-on-metal implants does not contribute to higher material loss at the head taper, without statistical correlation between taper wear and frictional moments.
JOURNAL OF BONE AND JOINT SURGERY-AMERICAN VOLUME
(2022)
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
Engineering, Biomedical
Alican Tuncay Alpkaya, Senay Mihcin
Summary: Understanding wear mechanisms is crucial for preventing primary failures and revision surgery in total hip replacement (THR). This study presents a wear prediction model for PEEK-on-XLPE bearing couple, simulating a 3D-gait cycle loading over 5 million cycles. The predicted volumetric and linear wear rates of XLPE liner per million cycles were 1.965 mm3/Mc and 0.0032 mm/Mc respectively. These results are consistent with existing literature. PEEK-on-XLPE shows promising wear performance in THR application and could be considered as an alternative material to CoCr head in XLPE-bearing couples. The wear prediction model can be utilized to optimize design parameters and extend the lifespan of hip implants.
MEDICAL ENGINEERING & PHYSICS
(2023)
Article
Engineering, Mechanical
Ruimin Shi, Bukang Wang, Jiquan Liu, Zhiwei Yan, Lei Dong
Summary: This study investigated the wear mechanism and worn surface topography of PEEK and CFR-PEEK through wear tests. The results showed that the wear of PEEK was influenced by cross-shear, while CFR-PEEK was not. CFR-PEEK exhibited superior wear resistance and is suitable for making artificial hip joints under low contact pressure condition.
Article
Optics
Xianda Jia, Yu Zhang, Xinran Dong, Zhiyong Wang
Summary: Gear transmission is crucial in mechanical engineering, but as gear systems advance, surface failures such as pitting and wear become more common. This paper proposes a novel method using laser micro-nano texture technology to improve lubrication conditions and wear resistance of gear surfaces. The results show that this method significantly enhances the lipophilic properties of gears, reduces wear depth and friction coefficient, and extends the service life of gears.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Orthopedics
Andre Lunz, Moritz Von Falkenhayn, Sebastian Jaeger, Tobias Reiner, Christian Merle, Marcus R. Streit, Tobias Renkawitz, Moritz M. Innmann
Summary: This study aimed to determine the minimum 20-year survival rates of a cementless press-fit cup in young patients. The results showed that the 22-year survival rate for aseptic cup or inlay revision was 94%, and the survival rate for aseptic cup loosening was 99%.
Article
Engineering, Biomedical
Dmitry Royhman, Robin Pourzal, Deborah Hall, Hannah J. Lundberg, Markus A. Wimmer, Joshua Jacobs, Nadim J. Hallab, Mathew T. Mathew
Summary: This study investigates the effects of microgrooves on the fretting-corrosion behavior of hip implant materials. Results show significant differences in electrochemical and mechanical responses between machined and polished surfaces. Machined surfaces reduce overall dissipated friction energy under acidic conditions.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2021)
Article
Chemistry, Physical
Sirine Frikha, Laurence Giraud-Moreau, Anas Bouguecha, Mohamed Haddar
Summary: Advanced manufacturing techniques are crucial in meeting the growing demand for high-quality products such as biomedical implants. This research explores the possibility of gradually shaping titanium biomedical implants and develops a manufacturing method using numerical simulation and design process.
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
Orthopedics
Stefan Klebingat, Tanja Bien, Janine Huertgen, Priyanka Grover, Marcel Dreischarf, Shareef Alkhateeb, Marcus Jaeger, Georg Rose
Summary: We propose and validate a novel, automated method for accurately and precisely measuring total hip arthroplasty parameters using CAD-model-based 2D-3D registration supported by convolutional neural networks. This method shows high accuracy and precision and has potential clinical applications.
JOURNAL OF ORTHOPAEDIC RESEARCH
(2023)
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, Mechanical
Shankar Swarup Das, Prasun Chakraborti
Summary: The study focuses on the tribological performance of metal-on-plastic type of hip prostheses and aims to enhance their lifespan. A novel biomaterial LHHA has been prepared by mixing low-density polyethylene, high-density polyethylene, and hydroxyapatite. The best blend, LHHA-30, is selected based on hardness, roughness, and ultimate strength. Experimental wear investigation reveals that LHHA-30 has a lower wear rate compared to UHMWPE acetabular cups.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2023)
Article
Orthopedics
I. Nizam, D. Dabirrahmani, A. Alva, D. Choudary
Summary: The study compared patient outcomes and complication rates between obese and non-obese patients undergoing direct anterior approach total hip arthroplasty with a Bikini incision. It found no statistically significant differences in complication rates between the two groups, with both showing significant post-operative improvements in patient-reported outcomes.
ARCHIVES OF ORTHOPAEDIC AND TRAUMA SURGERY
(2022)
Article
Biophysics
Nathan D. Camarillo, Rafael Jimenez-Silva, Frances T. Sheehan
Summary: This article discusses the statistical dependence between multiple measurements from the same participant and provides recommendations for using these measurements when they are not independent.
JOURNAL OF BIOMECHANICS
(2024)
Article
Biophysics
J. Huet, A. -S. Boureau, A. Sarcher, C. Cornu, A. Nordez
Summary: Standard compression in freehand 3D ultrasound induces a bias in volume calculations, but minimal compression and gel pad methods have similar results. With a trained examiner and precautions, the bias can be minimized and become acceptable in clinical applications.
JOURNAL OF BIOMECHANICS
(2024)
Article
Biophysics
C. Lariviere, A. H. Eskandari, H. Mecheri, F. Ghezelbash, D. Gagnon, A. Shirazi-Adl
Summary: Recent developments in musculoskeletal modeling have focused on model customization. Personalization of the spine profile may affect estimates of spinal loading and stability. This study investigates the biomechanical consequences of changes in the spinal profile and finds that personalizing the spine profile has medium to large effects on trunk muscle forces and negligible to small effects on spinal loading and stability.
JOURNAL OF BIOMECHANICS
(2024)
Article
Biophysics
Luke T. Mattar, Arash B. Mahboobin, Adam J. Popchak, William J. Anderst, Volker Musahl, James J. Irrgang, Richard E. Debski
Summary: Exercise therapy fails in about 25.0% of cases for individuals with rotator cuff tears, and one reason for this failure may be the inability to strengthen and balance the muscle forces that keep the humeral head in the correct position. This study developed computational musculoskeletal models to compare the net muscle force before and after exercise therapy between successfully and unsuccessfully treated patients. The study found that unsuccessfully treated patients had less inferiorly oriented net muscle forces, which may increase the risk of impingement.
JOURNAL OF BIOMECHANICS
(2024)
Article
Biophysics
Natsuki Sado, Takeshi Edagawa, Toshihide Fujimori, Shogo Hashimoto, Yoshikazu Okamoto, Takahito Nakajima
Summary: The existing methods for predicting hip and lumbosacral joint centres in Japanese adults are biased and differ between sexes. We propose new regression equations that consider soft-tissue thickness, sex differences, and a height-directional measure, and validate them using leave-one-out cross-validation.
JOURNAL OF BIOMECHANICS
(2024)
Article
Biophysics
Peimin Yu, Xuanzhen Cen, Qichang Mei, Alan Wang, Yaodong Gu, Justin Fernandez
Summary: This study aimed to explore the intra-foot biomechanical differences among individuals with chronic ankle instability (CAI), copers, and healthy individuals during dynamic tasks. The study found that copers and CAI individuals had smaller dorsiflexion angles and copers presented a more eversion position compared to healthy participants. Copers also had greater dorsiflexion angles in the metatarsophalangeal joint and more inversion moments in the subtalar joint during certain tasks. These findings can help in designing interventions to restore ankle joint functions in CAI individuals.
JOURNAL OF BIOMECHANICS
(2024)
Article
Biophysics
Jon Skovgaard Jensen, Anders Holsgaard-Larsen, Anders Stengaard Sorensen, Per Aagaard, Jens Bojsen-Moller
Summary: This study investigates the biomechanical effects of robot-assisted body weight unloading (BWU) on gait patterns in healthy young adults. The results show that dynamic robot-assisted BWU enables reduced kinetic requirements without distorting biomechanically normal gait patterns during overground walking.
JOURNAL OF BIOMECHANICS
(2024)