fracture repair

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Braz. oral res.  vol.27 número3

Braz. oral res. vol.27 número3

Abstract: The purpose of this retrospective study was to evaluate con- tributing factors in patients requiring surgical retreatment of mandibular fractures. Of all the patients with mandibular fractures who were treated using internal ixation at a trauma hospital over a seven-year period, 20 patients (4.7%) required a second surgery and thus composed the “reop- erated” group. The control group comprised 42 consecutive patients with mandibular fractures who were treated at the same clinic and who healed without complications. Medical charts were reviewed for gender, age, substance abuse history, dental condition, etiology, location of fracture, degree of fragmentation, fracture exposure, teeth in the fracture line, associated facial fractures, polytrauma, time elapsed between trauma and initial treatment, surgical approach and ixation system. Statistical analyses were performed using the Statistical Package for Social Sciences (SPSS) version 20.0; descriptive statistics and the chi-squared test were used to determine differences between groups. Signiicant differences in substance abuse (p  =  0.006), dental condition (p  <  0.001), location of fracture (p = 0.010), degree of fragmentation (p = 0.003) and fracture ex- posure (p < 0.001) were found. With regard to age and time elapsed be- tween trauma and initial treatment, older patients (31.4 years, SD = 11.1) and a delay in fracture repair (19.1 days, SD = 18.7) were more likely to be associated with reoperation. It was concluded that substance abuse, age, dental condition, location of fracture, degree of fragmentation, frac- ture exposure and the time between trauma and initial treatment should be considered contributing factors to the occurrence of complications that require surgical retreatment of mandibular fractures.
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Chondrocytes transdifferentiate into osteoblasts in endochondral bone during development, postnatal growth and fracture healing in mice.

Chondrocytes transdifferentiate into osteoblasts in endochondral bone during development, postnatal growth and fracture healing in mice.

During endochondral bone formation, which is responsible for the generation of most bones in mammals and many other species, osteoblasts deposit a bone-specific matrix on the surface of cartilage scaffolds made by chondrocytes and hypertrophic chondrocytes. It has long been thought that the terminally differentiated chondrocytes in this cartilage scaffold undergo cell death. Here we demon- strate that chondrocytes can transdifferentiate into oste- oblasts and that these transdifferentiated osteoblasts represent a substantial fraction of the bone forming cells in mice, We also provide evidence that chondrocytes can transdifferentiate into osteoblasts during bone fracture repair, a process similar to endochondral bone formation.
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Zygomatic arch fracture in a dog treated with Veterinary Cuttable Plate – case report

Zygomatic arch fracture in a dog treated with Veterinary Cuttable Plate – case report

For the postoperative evaluation radiographs were chosen for better visualization of the plate position and alignment over the skull bones and to compare with the postoperatively follow ups. Interpretation of these radiographs might be challenging because healing in this region is difficult to assess because the thin cortical bone heals with less callus formation specially when there is good stability in the fracture repair (Scott 1998). Long term follow-up revealed good fracture healing, at 4 weeks recheck the patient had no signs of infection or implant loosening.
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J. bras. pneumol.  vol.39 número3

J. bras. pneumol. vol.39 número3

highest in the patients submitted to femur fracture repair (4.6%) among the major orthopedic surgeries in our study population. This can be explained by the following factors: patients undergoing femur fracture repair are commonly older, and long bone fracture itself increases the risk for VTE due to prolonged immobility and increased endothelial injury.

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Alloxan-induced diabetes delays repair in a rat model of closed tibial fracture

Alloxan-induced diabetes delays repair in a rat model of closed tibial fracture

bone, as reported in other diabetes models (6-12,21-24). The effects of alloxan-induced diabetes on bone tissue include decreased trabecular bone volume and cortical width, increased bone collagen glycosylation and de- creased rate of bone resorption (30). We observed that alloxan-treated rats showed morphologic alterations in the pancreatic islets (27,28). Controlled insulin therapy may revert the disorders in fracture repair observed in the poorly compensated diabetic metabolic state (8,11,12,21); however, in the usual clinical situation, a diabetic patient with insulin-dependent type 1 diabetes treated with insulin may still suffer from an overall poor diabetic metabolic state with an uncontrollable or hardly controllable blood- glucose level and a high and sometimes changing insulin requirement. Thus, glycemic control in humans is pivotal for improving or increasing the speed of the healing pro- cess after injury and decreasing the significant morbidity associated with uncontrollable blood-glucose levels dur-
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Alloxan-induced diabetes delays repair in a rat model of closed tibial fracture

Alloxan-induced diabetes delays repair in a rat model of closed tibial fracture

bone, as reported in other diabetes models (6-12,21-24). The effects of alloxan-induced diabetes on bone tissue include decreased trabecular bone volume and cortical width, increased bone collagen glycosylation and de- creased rate of bone resorption (30). We observed that alloxan-treated rats showed morphologic alterations in the pancreatic islets (27,28). Controlled insulin therapy may revert the disorders in fracture repair observed in the poorly compensated diabetic metabolic state (8,11,12,21); however, in the usual clinical situation, a diabetic patient with insulin-dependent type 1 diabetes treated with insulin may still suffer from an overall poor diabetic metabolic state with an uncontrollable or hardly controllable blood- glucose level and a high and sometimes changing insulin requirement. Thus, glycemic control in humans is pivotal for improving or increasing the speed of the healing pro- cess after injury and decreasing the significant morbidity associated with uncontrollable blood-glucose levels dur-
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Rev. bras. ortop.  vol.49 número2

Rev. bras. ortop. vol.49 número2

Since the protocol can be used in a multicenter manner, the software allows researchers to classify the fractures into seven different systems. In comparing the incidences of the fracture types AO 31 A3, Tronzo V and Evan–Jensen III of the present study with the articles that describe these classification systems, it could be seen that the preva- lence of these fracture types of greater severity were higher. This demonstrates the current trend toward trauma pro- duced by mechanisms of higher energy, such as traffic accidents.

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FRACTURE ENERGY OF SELECTED BRITTLE SILICATES

FRACTURE ENERGY OF SELECTED BRITTLE SILICATES

In this research, the speciic fracture energy of almandine, zircon and periclase (MgO) are presented. The materials measured were in powder form during the measurement. A method of crushing the materials using a hydraulic press was used, followed by statistical analysis of the change in the surface of the powder. Values were taken from particle size measurements performed by a laser analyzer for the speciic surface area calculation. Additionally, the surface energy was calculated for periclase based on these measured values in order to evaluate whether the measurement was valid in comparison to the measured values speciied by other authors. The dependency of speciic fracture energy on crushing speed and environment in which the powder was crushed (air or water) was also analyzed.
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Rev. Col. Bras. Cir.  vol.44 número3

Rev. Col. Bras. Cir. vol.44 número3

Objective: to evaluate the early postoperative results of inguinal hernia repair by the conventional technique with self-fixating mesh versus laparoscopic totally extraperitoneal repair with polypropylene mesh. We compared pain, surgical time and early complications. Methods: this is a prospective, case-series study of 80 consecutive patients treated in the surgical clinic of the Gaffrée e Guinle University Hospital (HUGG). We included patients with unilateral inguinal hernia, not relapsed and operated only on an elective basis. We divided patients into two groups of 40 patients each, SF group (conventional technique using self-fixating mesh) and LP group (laparoscopic technique with polypropylene mesh). We followed patients up until the 45th postoperative day. Results: of the 80 patients, 98.7% were male and the majority had indirect right inguinal hernias (Nyhus II). There was no difference between the groups studied in respect to pain and opera- tive time. However, more complications occurred (seroma and hematoma) in the open surgery group. Conclusion: both operations have proved feasible, safe and with minimal postoperative pain and a low operating time.
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Modeling of Gas Production from Shale Reservoirs Considering Multiple Transport Mechanisms.

Modeling of Gas Production from Shale Reservoirs Considering Multiple Transport Mechanisms.

In this paper, a general numerical model for SGRs was proposed which was constructed based on the dual porosity model (DPM). Mass balance equations were constructed for both matrix and fracture systems using the dusty gas model. In the matrix, Knudsen diffusion, gas desorption, and viscous flow were considered. Gas desorption was characterized by the Lang- muir isothermal equation. In the fracture, viscous flow and non-darcy slip permeability were considered. The increase of the pore radius due to gas desorption was calculated from the gas desorption volume from the pore wall. Gas viscosity was characterized as a function of the Knudsen number. Weak form equations were derived for the system based on the constant pressure boundary and got solved using COMSOL. A comprehensive sensitivity analysis was conducted, and a detailed investigation was done to determine their impact on the shale gas production performance. The results showed that considering gas viscosity change greatly increased gas production under given reservoir conditions and slowed down the production decline curve. Considering pore radius increase due to gas desorption from the pore wall resulted in a higher production, but the effect was not very significant under the given reservoir conditions. In SGRs, both the matrix and fracture permeability changed during production. Ignoring one of these factors such as Knudsen diffusion, slippage effect, desorption, viscosity decrease, and porosity increase would lead to a lower cumulative production. Therefore, it is crucial to incorporate these factors into the existing models to obtain a more accurate shale gas production prediction.
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Braz. J. Cardiovasc. Surg.  vol.24 número4

Braz. J. Cardiovasc. Surg. vol.24 número4

Since 1991 our Institution has been using a preserved porcine pulmonary prosthesis: bicuspid prosthesis in patients under 2 years-old and pulmonary prosthesis (trileaflet) in children, in order to reconstruct the pulmonary valve and RVOT in patients with TOF, inducing a decrease in the residual VPI [5]. This series of patients undergoing TOF repair surgery have had an excellent prognosis and a good rate of survival in about 80% of the cases, seventeen years after the surgery and 78% of the surviving patients are free of reoperation and show good physical ability during exercise and practicing sports, in the late follow-up. A biologically engineered xenogenic heart valve based on the concept of acellularization offers promising results as a mean of overcoming the limitations of current prosthetic valves. These experimental studies suggest that: acellularized xenogenic porcine valved conduits are biocompatible heart valve prostheses that are repopulated with autologous cells and extracellular matrices over a reasonable lifespan and preserve the functional integrity without degeneration or calcification of the leaflet.
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The Critical Flow back Velocity in Hydraulic-Fracturing Shale Gas Wells

The Critical Flow back Velocity in Hydraulic-Fracturing Shale Gas Wells

The loss of prop pant during the flow back process in hydraulic fracturing treatments has been a problem for many years. The effectiveness of the fracture treatment is reduced. A well cleanup is often required to remove the unwanted proppant from the wellbore to re-establish production. Among several techniques available to reduce the prop pant loss, controlling flow back velocity within a critical range is an essential measure.

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Evaluation of Fracture Toughness of Ultraviolet-Irradiated Polycarbonate Using the Essential Work of Fracture Method

Evaluation of Fracture Toughness of Ultraviolet-Irradiated Polycarbonate Using the Essential Work of Fracture Method

may occur in the carbonyl group or, with less probability, in the benzene rings. In particular, the characterization of the amount of damage caused by UV irradiation to PC has not yet been performed. Therefore, in the present work the fracture toughness of PC exposed to different doses of UV irradiation was evaluated by the EWF method. The main motivation of this investigation is to be able, for the first time, to quantify changes in fracture toughness of PC due to UV irradiation using parameters determined by EWF results. The advantage of applying EWF over other conventional fracture toughness measurements, like common uniaxial tests, is due to the higher sensibility of EWF to different radiation dose as further discussed.
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Cholecystoenteric Fistule and Laparoscopic Repair

Cholecystoenteric Fistule and Laparoscopic Repair

Spontan enterobilier fistül, genellikle tedavisi yapılmayan safra kesesi taşına bağlı olarak gelişir ve çoğunlukla operasyon sırasında saptanır.. Postoperatif bilioenterik fistüller, g[r]

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MANAGEMENT OF A OBESE PATIENT WITH CERVICAL FRACTURE AND POLYTRAUMA WI TH BILATERAL ULTRASOUND GUIDED UPPER LIMB BLOCK FOR REPAIR OF FRACTUREBOTH UPPERLIMBS

MANAGEMENT OF A OBESE PATIENT WITH CERVICAL FRACTURE AND POLYTRAUMA WI TH BILATERAL ULTRASOUND GUIDED UPPER LIMB BLOCK FOR REPAIR OF FRACTUREBOTH UPPERLIMBS

INTRODUCTION: General anaesthesia is associated with increased mortality and morbidity in the obese patients. Similarly the regional anaesthesia in the obese can be technically challenging because of difficulties in identifying the usual bony land marks. A fifty two years obese patient reported to us in operation theatre with the multiple fractures for repair of fractures both upper limbs. The ultrasound guided brachial blocks were a preferred techniques for the surgery. Use of ultrasound has revived these peripheral nerve blocks as the visual guidance provided by the ultrasound not only results in the successful blocks but also avoids the complications associated with the blind procedures.
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Repair Mortars for Rammed Earth Constructions

Repair Mortars for Rammed Earth Constructions

For build with earth it is necessary to understand the main construction methods, the characteristics of the materials used and their mechanisms of degradation. This knowledge is also needed in order to hold proper rehabilitation and/or conservation interventions. When those factors are not taken into account it may lead to errors and premature anomalies appearance in buildings. The development of suitable repair methods for rammed earth is therefore necessary. Indeed, many old buildings are still deteriorating due to lack of maintenance or rehabilitations works, what leads to the need of deep interventions. Because the knowledge on rammed earth building techniques is still far from being consolidated, new buildings often present problems. This is related with the fact that this type of construction was not used for a long period of time and the investigation about it ceased with the appearance of new building materials, such as steel and concrete.
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Comparative study between two techniques of incisional hernia repair with polypropylene mesh in rabbits

Comparative study between two techniques of incisional hernia repair with polypropylene mesh in rabbits

The animals with surgical wound infection were excluded. Those with an infection-free incisional hernia were divided into two groups and reoperated after 30 days for repair. In Group 1 (G1), the hernial sac was isolated and resected, and incisional hernias were repaired through the approximation and suture of the muscle-aponeurotic plane with 4-0 monofilament nylon thread with separate stitches, and the placement of a 6cm x 2cm polypropylene mesh patch as a reinforcement, which was fixed with the same suture thread. In Group 2 (G2), isolation and resection of the hernial sac was followed by the placement of a polypropylene mesh patch, of the same size as the one used in G1, which was sutured to the borders of the hernial ring with 4-0 monofilament nylon thread without approximation of the muscle aponeurotic plane (as a bridge). In both groups, the skin was sutured with separate stitches using 4-0 monofilament thread.
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Braz. J. Cardiovasc. Surg.  vol.21 número2

Braz. J. Cardiovasc. Surg. vol.21 número2

Method: Between July 2003 and October 2005, 42 patients (25 of whom suffered from AAAs) were treated with endovascular therapy for aortic diseases. The mean patient age was 74 ± 10.2 years with 92% men. The endovascular procedures were performed by a multidisciplinary team in the Hospital de Clínicas de Porto Alegre and Hospital Luterano (ULBRA). In twenty-four of the AAA patients, bifurcated grafts were used and only one had a straight graft. In all patients the procedure was carried out by femoral artery dissection in a catheterization laboratory. There was no need to convert to open repair.
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Genotoxic evaluation of sodium nitroprusside in Aspergillus nidulans

Genotoxic evaluation of sodium nitroprusside in Aspergillus nidulans

We evaluated the recombinogenic potential of so- dium nitroprusside towards A. nidulans diploid strains UT448//A757 (repair proficient) and A837//B211 (repair deficient) using the homozygotization index of various nu- tritional markers, homozygotization indices for the bi, paba and pyro genes being significantly higher in diploid strains treated with sodium nitroprusside (strains D2 to D4 and D6 to D18) as compared to untreated control strains (Tables 3 and 4). Diploid strains D1 and D5, derived from strain UT448//A757 treated with sodium nitroprusside, showed homozygotization indices of greater than 2 for the paba and bi genes but these results were not statistically significant (Table 3). In contrast, however, all the diploid strains ob- tained after sodium nitroprusside treatment of strain A837//B211 (strains D10 to D18) showed bi, paba and pyro genes homozygotization indices higher than 2 and signifi- cantly different from control values (Table 4). Kafer and Mayor (1986) and Yoon et al. (1995) showed that post- replication repair deficient A. nidulans uvsH mutants such as strains A837 and B211 have a high frequency of sponta- neous mitotic recombination in homozygous condition, a fact which explains the higher sodium nitroprusside sensi- tivity of the repair deficient diploid strain A837//B211 than the repair proficient strain UT448//A757.
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Braz. Dent. J.  vol.25 número4

Braz. Dent. J. vol.25 número4

The aim of this study was to determine the prevalence of sequelae in permanent teeth that had their predecessors traumatized and investigate associated factors. The study was carried out with clinical and radiographic data from 137 patient charts of the Traumatized Patient Care Program, Federal University of Santa Catarina (Brazil), totalizing 253 teeth. Data were gathered on gender, age at the time of trauma, type of trauma, type of post- trauma sequelae, trauma recurrence and crown alteration in the permanent successors. No statistically significant associations were found between permanent successor’s crown alteration and gender, age at the time of trauma, post-trauma sequelae or trauma recurrence (p>0.05). Significant associations were found between severe trauma (crown fracture with pulp exposure, lateral luxation, intrusion and extrusion) in the primary incisors and permanent successor’s crown alteration (p<0.05). Multivariate analysis revealed an association between severe trauma to the primary incisors and permanent successor’s crown alteration (OR: 4.1 – IC: 1.7-10.1). Alterations in the crown of permanent successors are associated with severe trauma to the primary incisors, as primary teeth affected by severe trauma have a fourfold greater chance of exhibiting permanent successor crown alteration in comparison to primary teeth that had minor trauma.
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