A5033789811- Spine and Intervertebral Disc Pathology
- Orthopaedic implants and arthroplasty
- Pelvic and Acetabular Injuries
- Hip disorders and treatments
- Medical Imaging and Analysis
- Optical measurement and interference techniques
- Musculoskeletal pain and rehabilitation
- Bone health and osteoporosis research
- Bone fractures and treatments
- Orthopedic Surgery and Rehabilitation
- Elasticity and Material Modeling
- Spinal Fractures and Fixation Techniques
- Medical Imaging Techniques and Applications
- Advanced X-ray and CT Imaging
- Knee injuries and reconstruction techniques
- Lower Extremity Biomechanics and Pathologies
- Hydrocarbon exploration and reservoir analysis
- Nerve Injury and Rehabilitation
- Tendon Structure and Treatment
- Advanced X-ray Imaging Techniques
- Hydraulic Fracturing and Reservoir Analysis
- Total Knee Arthroplasty Outcomes
- Osteoarthritis Treatment and Mechanisms
- Hip and Femur Fractures
- Bone Tissue Engineering Materials
Oregon State University
2015-2024
Rogers (United States)
2003-2015
University of California, Berkeley
2009
University of California, Davis
1993-2002
California State University, Sacramento
1999-2001
Orthopaedic Research Laboratories
1997-2001
VA Palo Alto Health Care System
1999
Cleveland Clinic
1999
University of California Davis Medical Center
1989-1998
Orthopaedic Center
1998
Digital volume correlation, an experimental method for volumetric strain measurement, has experienced a growth in technique development and application since its introduction 1999. This largely been the result of more accessible imaging methods greater speed capacity computational facilities. paper reviews recent work using presents examples from author's laboratory. The emerging message is that, although closely related to surface-oriented digital image distinct due predominant reliance on...
To determine relative stiffness of various methods posterior pelvic ring internal fixation.Simulated single leg stance loading OTA 61-Cl.2, a2 fracture model (unilateral sacroiliac joint disruption and pubic symphysis diastasis).Orthopaedic biomechanic laboratory.Pubic gapping, hemipelvis coronal plane rotation.Nine different fixation were tested on each six hard plastic models. Pubic was plated. The loaded to 1000N.All data normalized values obtained with a iliosacral screw. types could be...
We performed a biomechanical study of seventeen hip joints in the pelves nine cadavera order to assess role that acetabular labrum and transverse ligament play load transmission. The distribution contact area pressure between acetabulum femoral head was measured with four different conditions: intact (seventeen hips), after removal (eight entire (nine both hips). joint loaded simulated single-limb stance, measurements were made use pressure-sensitive film.A peripheral seen acetabula. This...
Abstract A new technique, termed texture correlation, is described for the measurement of displacement and strain patterns within samples trabecular bone. Texture correlation a modification digital image method analysis deformation in objects marked with random surface speckle. Instead speckle, pattern itself used as basis correlation. Digitized contact radiographs unloaded loaded states are compared by computer to determine displacements grid points. Displacements filtered Savitsky‐Golay...
The mechanical properties of cancellous bone and the biological response tissue to loading are related deformation strain in trabeculae during function. Due small size trabeculae, their motion is difficult measure. To avoid need measure trabecular motions finite element method has been used estimate level deformation. This analytical approach empirically successful that models solvable results correlate with macroscopically measured stiffness strength bones. present work a direct comparison...
Tracking the dynamic morphology of active materials during operation lithium batteries is essential for identifying causes performance loss. Digital volume correlation (DVC) applied to high-speed operando synchrotron X-ray computed tomography a commercial Li/MnO2 primary battery discharge. Real-time electrode material displacement captured in 3D allowing degradation mechanisms such as delamination from current collector and crack formation be identified. Continuum DVC consecutive images...
The intervertebral disc (IVD) has a complex and multiscale extracellular matrix structure which provides unique mechanical properties to withstand physiological loading. Low back pain been linked degeneration of the but reparative treatments are not currently available. Characterising disc's 3D microstructure its response in physiologically relevant loading environment is required improve understanding develop new treatments. In this study, techniques for imaging native IVD, measuring...
We measured the distribution of contact area and pressure between acetabulum femoral head cadaveric pelves in three different conditions: intact, with an operatively created fracture posterior wall, after anatomical reduction fixation a buttress plate interfragmentary screws. The study involved eight hip joints from five loaded to 2000 newtons simulated single-limb stance. Measurements were made pressure-sensitive film. was divided into areas--the anterior superior aspect, wall--for analysis...
The indications for open reduction and internal fixation of posterior wall acetabular fractures associated with a clinically stable hip joint are unclear. In previous work large defect (27% articular surface area) resulted in significant alteration load transmission across the hip; specifically, there was transition from evenly distributed loading along to concentrated mainly superior portion during simulated single leg stance. However, majority involve smaller amount surface. Posterior not...
The transcription factor Ctip2/Bcl11b plays essential roles in developmental processes of the immune and central nervous systems skin. Here we show that Ctip2 also a key role tooth development. is highly expressed ectodermal components developing tooth, including inner outer enamel epithelia, stellate reticulum, stratum intermedium, ameloblast cell lineage. In Ctip2(-/-) mice, morphogenesis appeared to proceed normally through cap stage but developed multiple defects at bell stage. Mutant...
Abstract Analyzing the development of fracture networks in shale is important to understand both hydrocarbon migration pathways within and from source rocks effectiveness hydraulic stimulation upon reservoirs. Here we use time‐resolved synchrotron X‐ray tomography quantify four dimensions (3‐D plus time) fractures during accelerated maturation an organic‐rich mudstone (the UK Kimmeridge Clay), with aim determining nature timing crack initiation. Electron microscopy (EM, scanning...
ABSTRACT The optimal biomechanical function of the spine depends on hierarchical structures spanning whole joint to molecular scales. vertebral endplates experience complex, location specific loading from intervertebral discs, and their behaviour is governed by microarchitecture, mineralisation, prestrain constituent bone cartilage. Here we use a combination synchrotron X-ray tomography, digital volume correlation, wide-angle diffraction investigate relationships between microstructure...
Objective: To evaluate the biomechanical behavior of gap and step malreductions in a model transverse acetabular fracture. Design: Cadaver pelvis loading simulated single-leg stance with intact acetabulum, after fracture anatomically reduced, malreduction. Five transtectal fractures; five juxtatectal fractures. Setting: Quasi-static hip abductor mechanism to physiologic loads pressure-sensitive film interposed joint determine contact area pressure within joint. Main Outcome Measurement: Hip...