Abstract：
:Contemporary knee designs differ considerably in the conformity that exists between the articulating surfaces of the femoral and tibial components. The thickness of the polyethylene components also varies from design to design. Conformity and thickness affect the stresses associated with surface damage and the subsequent generation of harmful polyethylene debris. In this study, the stresses and strains caused by contact were calculated for 8 contemporary knee prostheses. Finite element analysis using large-strain theory was used to determine the stresses and strains for the minimum available polyethylene thickness and for the knee in flexion. The greatest differences among designs was for the von Mises strain, which reached its maximum beneath the surface. The differences in stresses were less notable because of the nonlinear material behavior of the polyethylene. This study also confirmed the advantages of designs that have more conforming articulating surfaces and thicker polyethylene components.
journal_name
Clin Orthop Relat Resjournal_title
Clinical orthopaedics and related researchauthors
Bartel DL,Rawlinson JJ,Burstein AH,Ranawat CS,Flynn WF Jrsubject
Has Abstractpub_date
1995-08-01 00:00:00pages
76-82issue
317eissn
0009-921Xissn
1528-1132pub_type
杂志文章abstract：:Reaming increases intramedullary pressure and can cause fat intravasation. This study investigated the influence of reaming parameters on pressure changes using the AO, Gray, and Howmedica reamers. Silicone cylindrical shells with 10-, 11-, 16-, 19-, and 20-mm inner diameters were filled with a 1:2 ratio of paraffin a...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：10.1097/00003086-200004000-00036
更新日期：2000-04-01 00:00:00
abstract：:The aim of this study was to describe the course of untreated or conservatively treated arthrosis of the knee joint. Of 265 patients presenting with knee pain who had weightbearing radiographs taken between 1970 and 1973, 132 (33 men and 99 women) responded to and participated in a clinical followup 20 years later usi...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：10.1097/00003086-199707000-00019
更新日期：1997-07-01 00:00:00
abstract：:A theory for the mechanism of electrical bone stimulation proposes that passage of an electric current reduces the local PO2 and raises the pH near the cathode, thereby creating a favorable environment for osteogenesis. To study the effects of electric current passage on the PO2, PCO2 and pH in the vicinity of the ele...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1983-03-01 00:00:00
abstract：:In a 37-year-old man, bilateral infraspinatus muscle weakness was associated with compression of the suprascapular nerve. The compression occurred at the spinoscapular angle by bilateral development of ganglia. The lesion was confirmed by electromyography. Surgical approaches to the area are described along with a rev...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1982-06-01 00:00:00
abstract：:Thirty-two consecutive subtrochanteric fractures in 32 patients were stabilized using the Medoff sliding plate and were followed up prospectively for 1 year. Two patients died during the first postoperative year. Twenty-nine of the remaining 30 (97%) fractures united by 1-year followup. Two types of plate dynamization...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1998-03-01 00:00:00
abstract：BACKGROUND:During hip arthroplasties for treating proximal femur metastases, a long femoral stem frequently is used, presumably protecting the entire femur against progression of the existing lesions or development of new lesions. However, it is unclear whether a long stem is really required. QUESTIONS/PURPOSES:We the...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：10.1007/s11999-013-2790-4
更新日期：2013-05-01 00:00:00
abstract：:This report is a prospective review of 450 low-friction arthroplasties (LFAs) performed by a single surgeon from 1972 to 1983 in a community hospital. The clinical results show sustained quality of the result over a maximum follow-up period of 11 years. The radiologic review shows a slight increase in the number and s...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1986-10-01 00:00:00
abstract：:While the entity of nonsecretory myeloma is rare, its diagnosis may be delayed or remain undetected if too much reliance is placed on the presence of a serum or urinary M component, which traditionally has been considered an important, if not essential, feature of plasma cell myelomatosis. Nonsecretory myeloma is char...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1982-11-01 00:00:00
abstract：:Obtaining continuing education can be difficult in countries with limited resources. Members of the Pediatric Orthopaedic Society of North America (POSNA) have developed a program for providing outreach continuing education courses in pediatric orthopaedics. POSNA members provide their own transportation to the host c...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：10.1007/s11999-008-0381-6
更新日期：2008-10-01 00:00:00
abstract：:Fifty consecutive patients treated with chymopapain injection for a clinical and radiographic diagnosis of herniated nucleus pulposus were evaluated prospectively. All patients had a prechymopapain computed tomography (CT) scan and a three-month postinjection CT scan. In addition, ten patients (20%) had a six-month po...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1987-06-01 00:00:00
abstract：:Learning problems in patients with neurofibromatosis (NF) are probably the most frequent characteristics after those that define the disorder. They are not secondary to the physical problems. A recent survey that compared children who have NF with their siblings revealed a 37% greater incidence of learning disabilitie...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1989-08-01 00:00:00
abstract：:Scoliosis screening has been practiced for nearly 50 years and has provided valuable knowledge about the prevalence and natural history of scoliosis. Early diagnosis allows for nonoperative treatment, like wearing an orthosis that has been shown to be effective by numerous outcome studies. Challenges in scoliosis scre...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章,评审
doi：10.1097/01.blo.0000163242.92733.66
更新日期：2005-05-01 00:00:00
abstract：:Two hundred thirty-four primary total knee prostheses were evaluated with a 45 degrees merchant view to examine patellar position and fixation. Despite a standardized technique for obtaining roentgenographs, patellar position varied with leg position. Overall, 54.7% tracked centrally, 31.2% tilted, and 14.5% displaced...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1993-01-01 00:00:00
abstract：:During the past 30 years, the orthopaedic oncology group at the Massachusetts General Hospital has treated 648 patients with osteosarcoma centrally located in the bone. Using records maintained in a specifically designed computer system, a study was done to assess the factors that seemed to influence the survival outc...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：10.1097/01.blo.0000145991.65770.e6
更新日期：2004-12-01 00:00:00
abstract：:Despite the clinical success of total knee arthroplasty, little information can be found in the literature about the relationship between certain postoperative physical findings and the outcome. Specifically, is the range of motion related to patient perception of outcome? We performed a cohort prospective study on 48...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：10.1097/BLO.0b013e318046ccb7
更新日期：2007-07-01 00:00:00
abstract：:Experience with cementless fixation over the last six years indicates that the technique offers greater opportunities for bone conservation. Thus, when cement is used, and especially if it is forced into the skeleton under pressure, the amount of bone incorporated into the implant is considerable. Conversely, if no ce...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1985-01-01 00:00:00
abstract：BACKGROUND:Anecdotal evidence from second-look hip arthroscopies and animal studies has suggested spontaneous labral regrowth may occur after débridement. However, these observations have not been systematically confirmed. QUESTIONS/PURPOSES:We (1) determined whether labral regrowth occurs after débridement in human h...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：10.1007/s11999-013-2914-x
更新日期：2013-08-01 00:00:00
abstract：:Destroyed patellar articular surfaces were replaced with a high molecular weight polyethylene prosthesis in two patients. The patellofemoral articulation of the femur consisted of eburnated bone in one case and degenerative cartilage in the other. Both operations failed within one year because of a giant cell synoviti...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1976-03-01 00:00:00
abstract：:In 1958 a group of Swiss general and orthopaedic surgeons established the AO (Arbeitsgemeinschaft für Osteosynthesefragen) or the Association of the Study of Internal Fixation (ASIF) to strive to transform the contemporary treatment of fractures in Switzerland. This association was revolutionary in development of inst...
journal_title：Clinical orthopaedics and related research
pub_type： 传,历史文章,杂志文章
doi：
更新日期：1998-02-01 00:00:00
abstract：:The ideal local antibiotic delivery system has not been created. Antibiotic-laden bone cement has become the gold standard in the treatment of infected orthopaedic implants and there are confirmatory laboratory and clinical data that support the use of these materials. Heat-stable antibiotics elute from antibiotic-lad...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章,评审
doi：10.1097/01.blo.0000143741.92384.18
更新日期：2004-10-01 00:00:00
abstract：BACKGROUND:Proximal femoral fractures are common in the elderly. The best care depends on expeditious presentation, medical stabilization, and treatment of the condition. QUESTIONS/PURPOSES:We investigated the risk of increased mortality in residents of rural communities secondary to inaccessible facilities and treatm...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：10.1007/s11999-011-2140-3
更新日期：2012-06-01 00:00:00
abstract：:Two current areas of research on hard tissues have focused upon acidic lipids associated with the local mechanism of calcification and the presence of matrix vesicles as the loci for initial mineralization. Data which show that acidic phospholipids are a component of the vesicle membrane provide a common denominator b...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1976-07-01 00:00:00
abstract：:To investigate the role of blood supply in the pathogenesis of idiopathic osteonecrosis of the femoral head, superselective angiography of the medial circumflex artery was performed. Sixteen hips with early stage osteonecrosis diagnosed by bone scintigraphy were studied, as were 22 contralateral normal hips (from unil...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1992-04-01 00:00:00
abstract：:Although bone stress injuries are common in male military trainees, it is not known how common they are in female trainees. It also is unclear whether asymptomatic bone stress injuries heal if intensive training is continued. We prospectively followed 10 female trainees of a military Reserve Officer Course. The subjec...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：10.1007/s11999-009-0851-5
更新日期：2009-11-01 00:00:00
abstract：:To address the issue of nonunion with trochanteric osteotomy, surgeons have experimented with various modes of fixation, wire and cable being the two most popular. From a group of 643 primary cemented total hip arthroplasties performed by a single surgeon via the trans-trochanteric approach, minimum four-year roentgen...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1992-12-01 00:00:00
abstract：BACKGROUND:Recently, the authors of two prospective multicenter observational studies recommended surgery to improve head sphericity in older children, whereas large retrospective observational studies suggest that surgery does not improve head sphericity in older children. Thus, the treatment for Legg-Calvé-Perthes di...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章,meta分析,评审
doi：10.1007/s11999-012-2326-3
更新日期：2012-09-01 00:00:00
abstract：BACKGROUND:Studies suggest, even when controlling for disease severity, socioeconomic status, education, and access to care, racial and ethnic minorities receive lower-quality health care and have worse perceived pain and function before and after total joint arthroplasty. QUESTION/PURPOSES:We evaluated the influence ...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：10.1007/s11999-011-1841-y
更新日期：2011-07-01 00:00:00
abstract：:The ability to forecast the course and outcome of severe mechanical trauma would aid clinicians in making decisions concerning the treatment of patients. Multifactorial regression models, developed from data obtained from 933 patients with polytrauma and shock, have a high predictive value. A two-part data sheet was d...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1991-05-01 00:00:00
abstract：BACKGROUND:High hip center reconstructions, used in revision and complex primary THAs, rely on pelvic bone stock at least 35 mm above the anatomic teardrop. However, the technique does not restore normal hip biomechanics and controversy exists regarding acetabular implant survival. Previous reports document a wide rang...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：10.1007/s11999-012-2574-2
更新日期：2012-12-01 00:00:00
abstract：BACKGROUND:Large-head metal-on-metal (MoM) hip arthroplasties have demonstrated poor survival. Damage at the taper-trunnion junction is a contributing factor; however, the influence of junction design is not well understood. QUESTIONS/PURPOSES:(1) Does taper type affect fretting, corrosion, and volumetric wear at the ...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：10.1007/s11999-013-3115-3
更新日期：2014-02-01 00:00:00
