A5041626591- Orthopaedic implants and arthroplasty
- Total Knee Arthroplasty Outcomes
- Orthopedic Infections and Treatments
- Hip disorders and treatments
- Advanced materials and composites
- Bone Tissue Engineering Materials
- Bone and Joint Diseases
- Bone fractures and treatments
- Lower Extremity Biomechanics and Pathologies
- Osteoarthritis Treatment and Mechanisms
- Dental Implant Techniques and Outcomes
- Tribology and Wear Analysis
- Knee injuries and reconstruction techniques
- Powder Metallurgy Techniques and Materials
- Orthopedic Surgery and Rehabilitation
- Shoulder Injury and Treatment
- Bone health and treatments
- Metal Alloys Wear and Properties
- Pancreatic and Hepatic Oncology Research
- Renal cell carcinoma treatment
- Multiple and Secondary Primary Cancers
- Gastrointestinal Tumor Research and Treatment
- Cancer Research and Treatments
- Tendon Structure and Treatment
- Musculoskeletal Disorders and Rehabilitation
Saiseikai Nakatsu Hospital
2011-2024
Osaka University
2011
Osaka City University
1998-2008
Social Welfare Organization Saiseikai Imperial Gift Foundation
2005
Osaka Rosai Hospital
2003
Niigata University
2000
Osaka University of Health and Sport Sciences
2000
Centre National de la Recherche Scientifique
1994
Université Paris Cité
1994
The purpose of the current study was to investigate bone anatomy in determining rotational alignment total knee arthroplasty using computed tomography. Axial images 109 knees 83 patients with varus osteoarthritis who had were analyzed. On distal femur and proximal tibia, a baseline for anteroposterior axis each component drawn based on epicondylar medial (1/3) tibial tuberosity tibia. angle between these two lines analyzed as mismatch components when they aligned anatomic landmarks bone....
Second-generation total ankle arthroplasties have encouraging medium-term results, but the wear of joint materials is concern. The aim current study was to examine and compare size, shape, concentration polyethylene particles in synovial fluid with established posterior-stabilized knee arthroplasties. Synovial obtained from 15 patients well-functioning 11 at least 6 months after surgery. Polyethylene were isolated analyzed using scanning electron microscopy. Particle size (equivalent circle...
The aims of the current study were to examine polyethylene particles in synovial fluid at an early stage, and compare a newly introduced medial pivot total knee prosthesis with established posterior-stabilized prosthesis. Synovial was obtained 1 year after arthroplasty from 17 patients well-functioning prostheses (22 knees, 11 prostheses) under complete sterile conditions. Polyethylene isolated analyzed by scanning electron microscopy. Particle size (equivalent circle diameter) 0.78 ± 0.08...
Navigation systems have been developed to achieve more reliable prosthetic alignment in TKAs. However, the component sagittal plane is reportedly less than coronal even with navigation systems. We measured and compared alignments for TKAs conventional technique three approaches establish reference frames, using radiographs of entire lower extremity while standing. The simulated on differed by a mean 2 degrees 4 . Use resulted 1 hyperextension between femoral tibial components use flexion....
We have reviewed 103 of 126 Chiari osteotomies carried out in our department between 1956 and 1987. The cases were graded radiologically, using the Japanese Orthopaedic Association (JOA) system, into a pre/early osteoarthritis (OA) group an advanced OA group. In there 86 hips. mean follow-up was for 17.1 years (4 to 37). Preoperatively, 51 hips had average JOA clinical score 78.6 ± 8.4 points final 89.4 12.5 points. Advanced degenerative change developed 33.7% one hip required total...
Abstract The size, shape, and number of polyethylene wear particles found in synovial fluids patients 1 year after implantation 22 well‐functioning total knee prostheses (11 contemporary mobile‐bearing type, 11 posterior‐stabilized type) were determined. Polyethylene isolated from examined by scanning electron microscopy. Particle size (equivalent circle diameter) was 0.81 ± 0.12 μm (mean standard error) types 0.78 0.08 types. shape (aspect ratio) 1.94 0.13 2.30 0.22 Total numbers (1.75...
This study compared the effectiveness of locking and non-locking palmar plating for unstable Colles' fractures in elderly. The patients treated with plates included 4 men 18 women a mean age 68 years (Group A) those 3 28 74 B). Radiographic parameters, including tilt, radial inclination length were measured before surgery, after surgery at final followup. There no significant differences respect any radiographic parameters between two groups pre-operatively. After all improved both there
Reduction of wear with highly crosslinked polyethylene (HXLPE) has been reported in vitro and vivo studies total hip prostheses. However, use HXLPE knee prostheses is still controversial. The aim this study was to compare particle generation that conventional the same design. Synovial fluid obtained from four knees inserts three at 1 year after operation. Polyethylene particles were isolated examined using a scanning electron microscope image analyzer. number each 0.28 +/- 0.12 x 10(6) HXPLE...
Background The direct anterior approach in THA is an intermuscular that requires no muscle detachment. However, it difficult to elevate the proximal femur for access femoral canal. Questions/purposes We asked (1) which part of capsule should be released allow effective elevation femur; (2) whether release internal obturator tendon allows elevation; and (3) hip hyperextension reduces ability femur. Methods conducted a cadaver study clinical study. In first study, was measured 6 hips 3...
To augment cement-bone bonding, we interposed hydroxyapatite granules at the interface (bioactive bone cement technique). Hydroxyapatite (2-3 g) were smeared on surface of acetabulum and femur just before cementing. We used porous 300 to 500 microm in diameter from 1986 1988 (first generation) 100 1989 1991 (second generation). followed 151 patients (222 hips) first generation 170 (252 second generation. The minimum followup was 15 years (mean, 17.3 years; range, 15-20 years). Radiolucent...
Abstract Polyethylene wear particles are one of the most important factors affecting results total hip arthroplasty (THA). To reduce generation and to achieve better long‐term THA, highly crosslinked polyethylene (HXPE) has recently been introduced come into wide use. Thus far, however, there have no reports on in vivo analysis HXPE particles. We isolated from periprosthetic tissue a failed THA analyzed using scanning electron microscope. The number was 5.33 × 10 7 g −1 . Particle size...
We have reviewed 103 of 126 Chiari osteotomies carried out in our department between 1956 and 1987. The cases were graded radiologically, using the Japanese Orthopaedic Association (JOA) system, into a pre/early osteoarthritis (OA) group an advanced OA group. In there 86 hips. mean follow-up was for 17.1 years (4 to 37). Preoperatively, 51 hips had average JOA clinical score 78.6+/-8.4 points final 89.4+/-12.5 points. Advanced degenerative change developed 33.7% one hip required total...
Abstract Low hepatic cytochrome P4503A (CYP3A) activities might play an important role for inducing osteonecrosis of the femoral head (ONFH) by corticosteroids. However, relationship between CYP3A activity and steroid‐induced ONFH is unknown. We have examined inducibility in a rabbit model. Sixty rabbits were divided into three groups. Hepatic inducer (phenobarbital, group P; n = 15), inhibitor (itraconazole, I; or saline (group C, 30) was administrated 3 weeks before intramuscular...
Alumina-on-alumina bearings for THA have markedly improved in mechanical properties through advances technology; however, alumina fracture is still a concern. We retrospectively reviewed 77 patients (82 hips) with cemented alumina-on-alumina THAs to identify factors relating failure. The mean age of the at surgery was 63 years. prostheses had polyethylene-backed acetabular component an inlay and 28-mm head. Revision performed because failure four hips (three fractures one dissociation;...