A5088077185- Orthopaedic implants and arthroplasty
- Total Knee Arthroplasty Outcomes
- Orthopedic Infections and Treatments
- Hip disorders and treatments
- Osteoarthritis Treatment and Mechanisms
- Knee injuries and reconstruction techniques
- Lower Extremity Biomechanics and Pathologies
- Advanced materials and composites
- Hip and Femur Fractures
- Pelvic and Acetabular Injuries
- Bone and Joint Diseases
- Shoulder Injury and Treatment
- Tribology and Wear Analysis
- Musculoskeletal Disorders and Rehabilitation
- Foot and Ankle Surgery
- Bone fractures and treatments
- Dental materials and restorations
- Orthopedic Surgery and Rehabilitation
- Health Systems, Economic Evaluations, Quality of Life
- Rheumatoid Arthritis Research and Therapies
- Bone health and osteoporosis research
- Medical Imaging Techniques and Applications
- Musculoskeletal synovial abnormalities and treatments
- Surgical Sutures and Adhesives
- Tendon Structure and Treatment
University of California, San Francisco
2011-2025
Tennessee Orthopaedic Clinics
2017-2024
University of Nevada, Reno
2023-2024
FH Aachen
2020
Stryker (United States)
2011-2018
Carson Tahoe Regional Medical Center
2013-2016
University of California San Francisco Medical Center
1998-2013
University of California, Berkeley
2002-2013
Orthopedic Institute
2010
Belden (Germany)
2009
PURPOSE: To evaluate differences in T2 values femoral and tibial cartilage at magnetic resonance (MR) imaging patients with varying degrees of osteoarthritis (OA) compared healthy subjects to develop a mapping display method based on calculation z scores for visual grading assessment heterogeneity OA. MATERIALS AND METHODS: Knee was evaluated 55 who were categorized radiography as (n = 7) or having mild OA 20) severe 28). Cartilage regions determined manual segmentation an MR image acquired...
To determine whether knee pain, stiffness, and limited function in patients with different stages of osteoarthritis correlate the degree disease assessed on magnetic resonance (MR) images radiographs.Radiographs 50 varying degrees were by using Western Ontario McMaster University (WOMAC) index Kellgren-Lawrence (KL) scale. MR obtained analyzed two readers for cartilage lesions, bone marrow edema pattern, ligamentous meniscal lesions.Thirteen 16 knees a KL score 4 showed full-thickness...
Deep infection following total hip arthroplasty is a devastating complication for the patient and costly one patients, surgeons, hospitals, payers. The purpose of this study was to compare revision infection, aseptic loosening, primary with respect their impact on hospital surgeon resource utilization referral patterns tertiary-care hospital.Clinical, demographic, economic data were obtained twenty-five consecutive patients an after replacement who underwent two-stage (Group 1) performed by...
The most commonly used bearing couple in prosthetic hip or knee joint replacements consists of a cobalt–chrome (CoCr) metal alloy articulating against ultrahigh‐molecular‐weight polyethylene. Ceramics have been as an alternative to metal‐on‐polyethylene replacement surgery arthritic hips and knees since the 1970s. In bearings, ceramic surfaces offer major benefit drastically reduced wear rates excellent long‐term biocompatibility, which can increase longevity joints. This is important...
Background: Previous reports have suggested that hospital resource utilization for revision total hip arthroplasty is substantially higher than primary arthroplasty. However, current United States Medicare hospital-reimbursement policy does not distinguish between the two procedures. The purpose of this study was to compare and arthroplasties with regard actual identify clinical demographic factors are predictive associated these Methods: We evaluated clinical, demographic, economic data 491...
Cui, Quanjun MD, MS1; Mihalko, William M. PhD1; Shields, John S. MD1; Ries, Michael MD2; Saleh, Khaled J. MSc, FRCS(C)3 Author Information
Atwood, Sara A. MS; Patten, Eli W. Bozic, Kevin J. MD; Pruitt, Lisa PhD; Ries, Michael D. MD Author Information
Abstract T 1ρ and 2 relaxation time constants have been proposed to probe biochemical changes in osteoarthritic cartilage. This study aimed evaluate the spatial correlation distribution of values Ten patients with osteoarthritis (OA) 10 controls were studied at 3T. The was investigated using Z ‐scores. variation patellar cartilage different layers. these measured texture analysis parameters based on gray‐level co‐occurrence matrices (GLCM). mean ‐scores for significantly higher OA vs. ( P...
Good, Victoria PhD; Ries, Michael MD; Barrack, Robert L. Widding, Kirstin MS; Hunter, Gordon Heuer, Dan MS Author Information
A higher degree of cross-linking has been shown to improve the tribological properties ultra-high molecular weight polyethylene in laboratory studies; however, its effect on vivo behavior not well established. We investigated wear mechanisms retrieved highly cross-linked acetabular liners order determine if early is accurately predicted by hip-simulator studies.A total twenty-four (twenty-one explanted and one unimplanted two ethylene-oxide-sterilized non-cross-linked liners) were examined...
Spector, Myron PhD; Ries, Michael D. MD; Bourne, Robert B. Sauer, Willard S. MS; Long, Marc Hunter, Gordon PhD Author Information
Ultra-high molecular weight polyethylene is a semicrystalline polymer, which means that portion of the molecules in solid crystalline phase and remaining rubbery amorphous phase. Varying polymer chemistry two phases can alter mechanical properties material. When highly cross-linked formed, cross-links occur but not region. Remelting after irradiation-induced cross-linking neutralizes free radicals are caused by irradiation also decreases amount crystallinity. Decreased crystallinity...
Although trabecular bone structure has been evaluated, variation with knee compartment and depth from joint surface is not completely understood. Cadaver knees were evaluated microcomputed tomography analysis for these variations. Objective differences compared between: medial vs. lateral compartments; femoral tibial bone; normal arthritic knees. Depth dependent changes in the parameters observed first 6 mm of cores knees: BV/TV, Tb.N Conn.D gradually decrease, while Tb.Sp SMI increase. In...
The surfaces of retrieved cobalt-chromium (CoCr) total knee arthroplasty femoral components show evidence roughening ( Fig. 1 ) 1-3. In vitro studies have shown that scratches on the hard counterface, particularly those at an angle to direction motion, can increase wear ultra-high molecular weight polyethylene 4-10. An alternative material, oxidized zirconium (OxZr), was developed provide improvement over CoCr in resistance roughening, frictional behavior, and biocompatibility 11-16....