Reinforcement cages are widely used for the treatment of large acetabular bone defects. We report the case of a loosened Burch-Schneider reinforcement ring causing a recurrent macrohaematuria due to a perforation of the urinary bladder. After performing several diagnostic procedures, the patient underwent ...

Acetabular osteolysis associated with socket loosening is one of the main long-term complications of total hip arthroplasty. In case of major bone loss, where <50% host bone coverage can be obtained with a porous-coated cementless cup, it is generally agreed that a metal ring or cage in association with a cemented component and allograft bone should be ...

Total hip arthroplasty (THA) still carries a higher failure rate in patients with avascular necrosis of the femoral head (AVN) than in a similar patient population with THA for other reasons. This is particularly true for the acetabular component. One of the major factors accounting for this is the compromised acetabular bone quality with structural ...

It was the purpose of this biomechanical in vitro study to characterize the initial mechanical stability of 3 different acetabular reinforcement prostheses as a function of implant design and bone stock conditions. M�ller and Ganz rings and Burch-Schneider cage (Protek, M�nsingen, CH) were fixed using 3 screws in normal acetabuli ...

Dislocation after primary total hip arthroplasty (THA) is the most commonly encountered complication and is unpleasant for both the patient and the surgeon. Constrained acetabular components can be used to treat or prevent instability after primary total hip arthroplasty. We present the case of a 42-year-old female with a BMI of 41. At 18 months post-primary THA the patient ...

The aim of this experimental study was to analyse the effects of implant design and bone stock defects on the primary stability of three different acetabular components. Fresh frozen human pelves were employed for the investigation. M�ller and Ganz rings and a Burch-Schneider cage (Protek, M�nsingen, Switzerland) were fixed with screws in 6 normal ...

Fifty-three patients (54 hips) treated with cemented total hip reconstruction with the aid of an acetabular mesh made of Vitallium (Howmedica Inc., Rutherford, New Jersey), a cobalt-chrome molybdenum alloy, to reinforce the medial cement for deficient bone stock in the central acetabular region, were evaluated at an average follow-up ...

... Title : UNIFORM OVAL REINFORCING RINGS - POWER SERIES EXPANSIONS,. Corporate Author : POLYTECHNIC INST OF BROOKLYN NY. ...

There are no clear explanations for the spectrum of hip dysplasia nor for the observation that in normal and dysplastic hips, final development may be unpredictable with or without treatment. Immunohistochemical and histological studies of a three month old child's acetabulae were performed. Multiple inclusions were found in the lateral ring epiphysis and in the three flanges ...

... Descriptors : *STRESS ANALYSIS, *FIBER REINFORCED COMPOSITES ... OPENINGS), SHEAR STRESSES, RINGS, REINFORCING ...

Based on low incidence and lack of personal experience only few evidence based studies exist on several questions in pelvic and acetabular surgery. As part of an international consensus pelvic and acetabular course personal preferences and experience of an distinguished faculty and senior participants were discussed and we summarize in the paper the ...

Stainless steel wire mesh has been used for many years to reinforce acetabular cement. A case has been seen in which considerable corrosion and disintegration of the mesh were noted, with gross metallosis of the surrounding tissues. It is postulated that galvanic corrosion occurred between the stainless steel mesh and the cobalt chrome femoral prosthesis. ...

PURPOSE: The purpose of this study was to investigate the mid-term results of 32 acetabular reconstructions performed using a Kerboull-type acetabular reinforcement device and bone graft between June 1997 and January 2009. METHODS: The mean age of the patients at the time of surgery was 71.4 years (range 55-85). Patients were ...

The major failure mode of cemented or noncemented acetabular fixation is osteolysis produced by biologic reaction to polyethylene and metallic debris. A monoblock acetabular noncemented component offers advantages in reducing the failure mechanism of acetabular cups. First, there is no extra-articular back surface polyethylene wear. ...

The complications, management, and outcome of a consecutive series of 61 ilioischial reconstruction rings performed by 1 surgeon over a 15-year period are reported. Structural corticocancellous allografts were used in 48 cases. Twenty-seven cases had no complications, 9 had medical complications, and 5 had complications related to femoral revision. Other complications included ...

... A ring-reinforced, orthotropic circular cylindrical shell subjected to ... FILAMENT WOUND CONSTRUCTION, *COMPOSITE MATERIALS, *SHELLS ...

STUDY DESIGN: Descriptive case report. OBJECTIVE: To report spinopelvic dissociation as a complication of autogenous bone graft harvest with the use of an acetabular reamer. SUMMARY OF BACKGROUND DATA: Iliac crest bone graft harvest has been previously described in orthopedic literature with overall complication rates of 0% to 39%. Complications are inconsistently separated ...

... WOUND CARBON FIBRE REINFORCED PLASTIC RETAINING RINGS, HOOPS AND CYLINDERS FOR ROTATING ELECTRICAL MACHINES,. ...

Objective: To describe a surgical technique for reinforced augmentation of the dorsal acetabular rim (DAR) using a string-of-pearls (SOP(�) ) locking plate and polymethylmethacrylate (PMMA) bone cement, and to report clinical outcome in 7 dogs. Study Design: Case series. Animals: Dogs (n=7). Methods: Medical records (November 2009-April 2010) of 7 dogs ...

We have reviewed, at a mean follow-up of 63.7 months, 36 total hip replacements performed with bulk acetabular autograft. Before surgery all the hips had acetabular insufficiency. Improvement of acetabular coverage was achieved in all cases with the patient's femoral head screwed to the ilium. Only one massive graft resorption was ...

BACKGROUNDThis is a cohort trial (1997�2005) of 49 patients submitted to an acetabular component revision of a total hip arthroplasty, using impacted human and bovine freeze-dried cancellous bone grafts (H&FDBG) and a reinforcement device.OBJECTIVETo compare clinical/radiographic graft incorporation capability between cancellous bone ...

A study in 25 rabbits, in which the acetabular roof was reinforced by inserting a wedge-shaped autologous tissue fragment of the apophysis, led to the following conclusions: That complete healing and ossification of the implant took place within the obser...

Limit loads under plane stress and plane strain are found for a circumferentially reinforced elastoplastic ring subjected to interior pressure. These are used as bounds on an estimate of the failure pressure of a SiC/Ti test rig that is being fabricated a...

A computer program is presented which gives the displacements and the stress distribution in a hydrostatically loaded ring-reinforced noncircular cylinder. The solution on which the program is based is obtained by an asymptotic expansion procedure in whic...

...must be circumferentially reinforced with bulkheads, baffles, ring stiffeners, or any combination thereof, in...may cover any circumferential joint. (c) When a baffle or baffle attachment ring is used as a circumferential...

... Title : The Effect of Filament Winding Process Variables on the Performance of Carbon or Fiberglass Reinforced NOL Rings,. Corporate Author : ...

... STUDIES, GLASS, CLADDING, PLASTICS, REINFORCING MATERIALS, RINGS, BUCKLING, STRUCTURAL PROPERTIES, PENETRATION ...

A review of current clinically applied biomaterials for the femoral heads and acetabular cups of total hip prostheses (UHMWPE, CoCrMo alloys, alumina and zirkonium) in terms of their resistance to wear is presented. Further developments in metallic and ceramic materials over the last few years have now left UHMWPE as the weakest link in the prosthesis material chain. ...

Two Lord prostheses, bilaterally implanted in cadavers, were sectioned. The contact areas between bone and prosthesis were studied and measured using a specially developed reproducible method. Primary fixation of the femoral components appeared to be based principally on wedging of the prosthetic stem in the femoral shaft with a rather small contact surface. In both acetabuli the screw threads of ...

Taguchi technique is a powerful method of solving engineering problems in order to improve the performance of a process and to enhance the productivity. The methodology for the design of the experiment is proposed in order to find the best parameters for better experimental results with less number of experiments as possible. In this study, Taguchi technique was applied to optimize the compression ...

A nuclear reactor containment structure which includes a reinforced concrete shell, a hemispherical top dome, a steel liner, and a reinforced-concrete base slab supporting the concrete shell is constructed with a substantial proportion thereof below grade in an excavation made in solid rock with the concrete poured in contact with the rock and also ...

A hollow reinforced concrete sphere can be used as a container for transporting compressed gas, such as natural gas. Such containers can be interconnected and towed from one place to another by an ocean-going tugboat. Each container is formed with three band-like groups of reinforcing rings. Each group has its ...

New material combinations have been introduced as the bearing surfaces of hip prostheses in an attempt to prolong their life by overcoming the problems of failure due to wear-particle-induced osteolysis. This will hopefully reduce the need for revision surgery. The study detailed here used a hip simulator to assess the volumetric wear rates of large-diameter ...

A thin, elastic elliptical ring is subjected to uniform external pressure. The lowest critical pressure is computed and presented for various ratio of the major axis to the minor axis of the elliptical ring. It is found that the critical pressure for an elliptical ring is higher than that for the circular ring ...

Arrangement for connecting a fiber-reinforced plastic pipe (18) to a stainless steel flange (12, 16), in which the end of the fiber-reinforced plastic pipe (18) is accommodated in a ring-shaped groove (12a, 16a) in the flange (12, 16), the groove conforming to the dimensions of the fiber-reinforced plastic pipe ...

The large deformation behavior of a membrane spherical shell subject to internal pressure loading is investigated. The shell contains a hole at the apex which is reinforced by an idealized thin ring. The incremental theory of plasticity is employed, effec...

This patent describes a fiber reinforced piston for an internal combustion engine comprising a top land and a ring region provided with an uppermost ring groove. The top land and the ring region are defined by a reinforced part of the piston formed by a matrix metal ...

Whisker pullout. Whisker pullout calculated surface. 34 ..... Examples include piston rings and valve stems for Stirling engines and other ...

... The analysis of cylinders;composed of many hays, as are ... For those bays between a loaded ring and the root ... for a radial load P, a tangential load T ...

... EQUIPMENT, CIRCULAR, CONDUITS, LOADS(FORCES), NONLINEAR ANALYSIS, FINITE ELEMENT ANALYSIS, LOAD DISTRIBUTION, RINGS. ...

... Professor RM Hermes Brooklyn 1, New York (1) College of Engineering University of Santa Clara Professor George Lee ...

... expanding monomer such as DNSOC polymerizes be- cause distances separating atoms forming the heterocyclic ring are covalent bond distances ...

... design characteristics to stop small rotor ... of internal turbine engine failures. ... RODS, RINGS, ARCHITECTURE, FAILURE(MECHANICS), STATICS ...

... DTIC Online - This search queries the DTIC Online Public ... reinforced shell are written in terms of the ... dependent line-loads and enter the analysis in ...

A system for controlling the deployment of a parachute canopy having a pair of reinforcement ribbons secured to the canopy. The lower edge of the canopy is turned inward and has reefing rings which engage a reefing line that passes through reefing rings s...

The report deals with the optimum structural design of circular cylindrical shells reinforced with identical uniformly spaced T-ring stiffeners, and subjected to external pressure loading. The optimization problems considered are of three types: (1) minim...

Since the Photon Factory storage ring (PF ring) was originally constructed in 1981, the ring has been upgraded four times with a change of the lattice configuration and/or a reinforcement of the power supplies for the quadrupole magnets. In September 2005, we succeeded in the fourth project, which is called as the ...

Metal mesh is helpful in relation to two complications of total hip replacement; namely, migration of the trochanter and fatigue fracture of the medial wall of the acetabulum. Mesh is applied over the greater trochanter in instances when the trochanter is excessively porotic and would crush as the wires are tightened. It is used to "recapture" the trochanter or trochanteric fragments if migration ...

Total hip arthroplasty has become a successful way of treating the painful and destroyed hip joint in the patient with rheumatoid arthritis (RA). Two hundred twenty (135 cemented and 85 noncemented) total hip arthroplasties were performed in 180 patients with rheumatoid arthritis. The average age was 48.61 years and the average follow-up was 8.4 years. Clinical evaluation was based on a Harris hip ...

Extraarticular fractures of the pelvic ring after periacetabular osteotomy could impair stability of the acetabular fragment and cause poor clinical and radiographic outcomes. We evaluated 17 patients (17 hips) with fractures of either the ipsilateral os pubis (n�=�12) or os ischium (n�=�5) during the postoperative period after periacetabular ...

The computed tomographic (CT) and conventional radiographic appearances of the acetabulum are correlated for assessment of acetabular fractures according to the Judet and Letournel classification system, a system widely used by orthopedic surgeons performing fracture reduction and external fixation of the acetabulum. A desiccated pelvis was marked along the ...

A technical description is given of the component parts of DESY, with a consideration of the normal ring tunnel, the ring tunnel in the target area, radial canals, linear accelerator, magnet ring carrier and foundation, experimental halls, and central building. The concrete, steel concrete, and reinforced ...

The listed assembly drawings provide the overall outline and assembly information in general for the SLAC SPEAR electron-positron storage ring's main beam line equipment modules. The various devices are mounted on reinforced concrete girders which act as moving platforms and support girders for the storage ring. These modules ...

A model of synovial fluid (SF) filtration by articular cartilage (AC) in a step-loaded spherical synovial joint at rest is presented. The effects of joint pathology (such as a depleted acetabular labrum, a depleted cartilage superficial zone consistent with early osteoarthritis and an inflammatory SF) on the squeezed synovial film are also investigated. Biphasic mixture models ...

BackgroundAcetabular fractures still are among the most challenging fractures to treat because of complex anatomy, involved surgical access to fracture sites and the relatively low incidence of these lesions. Proper evaluation and surgical planning is necessary to achieve anatomic reduction of the articular surface and stable fixation of the pelvic ring. ...

The authors reviewed the indications, technique, and results of cementing an acetabular liner into a well-fixed cementless acetabular shell. Indications for this procedure include a worn acetabular liner in a well-fixed cementless acetabular shell as well as an unstable total hip construct where the shell is ...

Stimulus control of ring swimming was studied with male Siamese fighting fish (Betta splendens) using 2-component multiple schedules in which the components were correlated with the presence or absence of air bubbles in the water. In Experiment 1, either response-independent mirror presentations or extinction was juxtaposed with immediate response-dependent mirror ...

Male Siamese fighting fish, Betta splendens, swam through a ring in an aquarium, breaking a photocell beam and initiating an unsignaled, resetting delay interval. Following delays of 0 s, 10 s, or 25 s, a 15-s mirror presentation released an aggressive display by the fish. Swimming through the ring increased in the absence of either a period of ...

Male Siamese fighting fish, Betta splendens, swam through a ring in an aquarium, breaking a photocell beam and initiating an unsignaled, resetting delay interval. Following delays of 0 s, 10 s, or 25 s, a 15-s mirror presentation released an aggressive display by the fish. Swimming through the ring increased in the absence of either a period of ...

Considering the probabilistic distributions of fibers in ring-type steel fiber reinforced concrete, the orientation factor and the number of ring-type steel fibers crossing the failure plane were theoretically derived as a function of fiber geometry, specimen dimensions, and fiber volume fraction. A total number of 24 specimens were ...

), slipped epiphysis, bursitis, developmental dysplasia of the hip and femoro-acetabular impingement