External Plate Research Articles

Tension performance of joint made in cold-formed square tube with self-tapping screw connections

The tension behavior of cold-formed square tube (CFST) screw connections was investigated experimentally and numerically. Ten test specimens were fabricated from the square tubes connected by external steel plates and internal tube applying self-tapping screws such that the number of screws was varied. In addition, the mechanical properties of the single-screw connections were obtained through single shear tests. Experimental results revealed that an increase in the number of screws led to higher bearing capacity and stiffness in the specimens. Shear failure of the screws was observed as the primary failure mode. When the number of the screws was equal in both types of the specimens, those with the internal tube exhibited superior tensile behavior than the ones with external steel plates. Subsequently, finite element (FE) models of the test specimens were developed. Upon validation of the test results, an extensive parametric study was conducted to further examine the influence of the design parameters on the tensile behavior of the CFST screw connections. Variation of the arrangement of screws, wall thickness of steel plates and their strength had only a minor influence on the tension behavior, and steel strength had little influence on the tension behavior and the number, spacing, and diameter of the screws were the key parameters affecting the tension behavior of the CFST screw connections. Based on the test results and FE analyses, the existing calculation method was modified, and a formula for calculating the tensile bearing capacity of the CFST screw connections was obtained. Comparison with the results indicate that the formula was conservative and reliable for determining the tensile capacity of CFST screw connections.

The effect of Casimir force on a diffraction grating in an optomechanical system

This study revisits an optomechanical cavity system to investigate how the Casimir force affects the manipulation of a diffraction grating. The proposed model consists of two mirrors, one of which is fixed while the other vibrates, and an external plate is used to generate the Casimir effect through the vibrating mirror. The Casimir effect has the potential to modify the properties of the output probe field (OPF), resulting in the phenomenon known as optomechanically induced transparency (OMIT), as reported in a previous study (Sci. Rep. 6, 27 102 (2016)). Interestingly, we observed that, when the Casimir effect exist, the maximum energy is transported to higher order. This theoretical realization of the diffraction grating could be feasibly tested in a physical experiment.

Risk factors for infection in severe open tibial shaft fractures

ObjectiveTo evaluate risk factors for infection in severe open tibial shaft fractures. MethodsA secondary analysis of a multicenter prospective study investigated internal versus external fixation of severe open tibia fractures at 20 US Level I trauma centers. Adult patients, aged <65 years, with a Gustilo-Anderson Type IIIB or severe IIIA metaphyseal or diaphyseal tibia fracture were included. All fractures underwent definitive fixation with either a modern ring external fixator, intramedullary device, and/or plate. Fourteen variables previously identified as risk factors for infection were included in the analysis. Deep surgical site infection was defined as an infection treated with surgical debridement within 1 year of index surgery. ResultsThe study cohort included 430 patients. Deep surgical site infection requiring reoperation occurred in 108 (25 %) patients. The final model identified four risk factors for infection: age >40 years (OR, 2.00; 95 % CI, 1.3–3.1), Gustilo-Anderson Type IIIB (OR, 1.80; 95 % CI, 1.1–3.0), embedded wound contamination (OR, 1.69; 95 % CI, 1.1–2.7), and wound length (OR, 1.02/cm; 95 % CI, 1.0–1.05). The model performed poorly at distinguishing infected from uninfected patients (Area Under the Curve=0.57; 95 % CI, 0.51–0.63). ConclusionsSurgeons can now counsel patients with these risk factors that they are at a markedly higher risk of infection. The identification of these risk factors may direct future research aimed at mitigating the risk of deep surgical site infection in this patient population.

Management strategies for Docking Site refractures: a comparative analysis of 19 patient cases

AimsThis study aimed to compare the clinical effectiveness of intramedullary nailing (IMN), percutaneous external plate fixation (PEPF), and re-applied external fixation (REF) in the treatment of refracture at the consolidated docking site following the removal of external fixation in patients with tibial defects who had previously undergone the Ilizarov bone transport technique.MethodsA retrospective review was performed on patients who received IMN, PEPF, or REF for refracture at the consolidated docking site subsequent to the removal of external fixation. A collection of data was made regarding the following parameters: age, gender, defect size, treatment methods, external fixation time (EFT), external fixation index (EFI), time of refracture (TOR) subsequent to fixation removal, and docking reunion time (DRT). Bone and functional outcomes were evaluated by the Association for the Study and Application of the Method of Ilizarov (ASAMI) scoring system and the Lower Extremity Functional Scale (LEFS) questionnaire.ResultsThe study included 14 males and 5 females with an average age of 38.1 ± 8.9 years (range, 26 to 55 years). Etiologies included post-traumatic osteomyelitis in 11 cases and post-traumatic bone loss in 8 cases. The median bone defect was 5.11 ± 0.87 cm (range, 3.8 to 6.8 cm). Following docking site refracture, 6 cases were treated with IMN, 8 with PEPF, and 5 with REF. All patients achieved both satisfactory bone union and functional outcomes, and there was no significant difference in preoperative baseline data or postoperative outcomes among the three groups.ConclusionIMN, PEPF, and REF were all demonstrated favorable postoperative bone and functional outcomes, suggesting their reliability as treatment options for managing docking site refracture following external fixation removal.

Study of Heat Flow at Substrate during Sputtering of Copper-Titanium Sandwich Target.

The purpose of this work is to study the kinetics of the heat flow heating the substrate, which is generated by a two-layer sandwich magnetron target when sputtered in argon. Its novelty resides in the application of the COMSOL Multiphysics to study the kinetics of thermal processes during sputtering of a target of the new type. The analysis was performed for a sandwich target with internal copper and external titanium plates when the discharge power varied in the range of 400-1200 W. The heating of the external target plate is described by a two-dimensional homogeneous Fourier equation. The solution to the equation reveals how the kinetics of the external plate's surface temperature distribution depends on the discharge power. To study the heat flow heating the substrate, the external plate is presented in the form of an additive set of small-sized surface heat sources. Previously unknown features of the thermal process are established. It is shown that numerical modeling adequately describes the experimental results.

SHORT TERM FUNCTIONAL OUTCOME OF CLOSED REDUCTION AND FIXATION OF TIBIA SHAFT FRACTURES USING UNREAMED ENDERS NAIL IN ADULT POPULATION - A PROSPECTIVE STUDY

Most of the tibial shaft fractures are the result of high energy trauma. There are various non surgical and surgical methods for managing tibial shaft fractures ranging from conservative casting, tubular external fixator, ring external fixator, open reduction and plating, reamed intramedullary interlocking nailing and unreamed intramedullary nailing. Aim of the study was to evaluate the functional outcomes of closed reduction with unreamed enders nailing as a definitive treatment option for closed tibial shaft fractures in adult population. In the study we included 150 adult patients who had sustained closed tibial fractures and underwent closed reduction and fixation with unreamed enders nailing within 12 hours of the injury. Eye of the nail, present at the distal end of the nails was locked. Total surgical time was averaged to 27.6 minutes. Evaluation was done by the time of clinical union, time of radiological union and VAS score. Ten patients had a delayed union. Two patients developed infection which was managed with oral antibiotics. In the conclusion, we found out that unreamed enders nailing procedure preserves the periosteum and its blood supply due to minimal exposure and improves the healing of fracture and decreases the incidence of infection. This method reduces the operative time, has a relatively less learning curve, reduces fluoroscopic exposure, reduces blood loss, reduces infection rate, doesnt expose the joint thus maintaining its congruity, reduces the cost of implant, reduces patient hospital stay, reduces the antibiotic usage and the implant removal at a later stage can be done as a day care procedure.

Numerical study on enhancing shear performance of RC beams with external aluminum alloy plates bonded using steel anchors

This article compromises a three-dimensional numerical study employing the Abaqus program to investigate the behavior of reinforced concrete (RC) beams externally strengthened in shear using aluminum alloy (AA) plates bonded utilizing steel anchors. Based on previous experimental tests, a numerical validation study was conducted in two parts. The first part modeled the interaction behavior using different bonding methods between steel plates and the surface of the RC beams, whether utilizing epoxy adhesive only, steel anchors only, or a dual system between them. The second part modeled the performance of shear-defected RC beams that externally strengthened by the AA plates using epoxy adhesive. To take into account debonding collapse due to epoxy adhesive bonding, the interaction between the AA plates and beam surface was simulated with a cohesive-damage interaction. Comparing the numerical results with previous experimental studies shows the success of the numerical model in simulating the performance of different bonding methods, as well as the behavior of the RC beams defected in shear and strengthened by the AA plates, which qualified it to study some additional variables. From the study it was found that by utilizing only epoxy adhesive, the strengthening technique using the AA plate over the entire shear span zone (AASP method) was capable of increasing the ultimate capacity of the defected beam by 104%, which represents 77% of the load of the non-defected beam. It was also demonstrated that the AA plates were susceptible to collapse by the out-of-plane buckling when bonded using the steel anchors only. By utilizing a dual system for bonding the AA plates consisting of epoxy adhesive and steel anchors, the AASP method was capable of enhancing the ultimate capacity of the defected beam by 164% and changing its failure pattern to the preferred ductile bending pattern.

Flexural performance of cold-formed square tube splice joints connected by self-tapping screws

Experimental studies and numerical simulations are performed to investigate flexural performance of cold-formed square tube (CFST) splice joints connected by self-tapping screws. Seven specimens were fabricated from the external steel plate and inner sleeve using self-tapping screws and underwent variations in screw quantity. Refined finite element models were developed and calibrated using a dataset of test results from cold-formed square tube splice joints. Subsequently, an extensive parametric study was undertaken to expand the CFST splice joints data pool, covering the CFST strength, thickness, screw diameter, spacing, as well as the number of rows and columns screws. Finally, a dependable design method for the flexural bearing capacity of CFST splice joints was derived from the experimental and finite element analysis results. The conclusions are as follows: (1) The flexural performance of inner sleeve specimens surpasses that of external steel plate specimens significantly. (2) Variations in steel strength and thickness minimally impacted the flexural bearing capacity of the specimens. Alterations in screw diameter, longitudinal spacing, rows and columns notably influenced the flexural performance of the specimens. (3) A comparison revealed that the proposed design method exhibited higher accuracy and safety in calculating the flexural bearing capacity of CFST splice joints.

Comparative study on flexural performance of ultra‐high performance concrete beams reinforced with steel rebar and steel plate

AbstractTo enhance the mechanical and constructional performance of the ultra‐high performance concrete (UHPC) beams, the steel plate placed at the bottom surface of the UHPC beam is utilized to replace the ordinary steel rebars. In this paper, four 3.2 m UHPC T‐shaped beams with different reinforcement patterns of ordinary steel rebars and external steel plate were fabricated and comparatively tested under flexure loading. Their damage patterns, load versus deflection behavior, flexural capacity, load versus strain behavior, moment versus curvature behavior, stiffness, and crack development were investigated. The flexural experiments indicated that the external steel plate, positioned at the bottom surface of the UHPC members, could resolve the difficulty of installing ordinary steel rebars in slender UHPC components and improve its constructional performance. Compared with the inside steel rebar reinforcement, the employment of the steel plate at the bottom surface of the UHPC beam can effectively increase the distance from the neutral axis to the tensile reinforcement at the serviceability and ultimate states, thereby improving its flexural capacity and stiffness. Additionally, the configuration of the external steel plate was beneficial to reduce the tensile stress level of the tensile reinforcement and limit the opening of UHPC crack width, and thus their crack resistance can be effectively enhanced. Moreover, increasing the thickness of the steel plate or rebar ratio can also significantly improve the flexural capacity, stiffness, and cracking resistance of UHPC beams.

Initial stiffness, ultimate capacity and failure mechanisms of tubular X-joints with external ring or plates at fire conditions

ABSTRACT This research work evaluates the effect of the ring, the plate and the joint geometry on the initial stiffness, ultimate strength and failure mechanisms of tubular X-joints subjected to axially compressive load at different fire conditions. At the first step, a finite element model was generated and verified by 19 experimental tests and 8 numerical models carried out by the present first author and other researchers. At the next step, 1170 numerical models were conducted. Using the generated FE models, the structural behaviour under different fire conditions (200°C, 400°C, 600°C and 800°C) was evaluated and compared to the corresponding behaviour at normal temperature (20°C). Results showed that both of the external ring and plate can notably increase the initial stiffness and ultimate capacity at all different elevated temperatures. Also, the use of these methods significantly improves the failure mechanisms at fire conditions. Two theoretical design formulas with high accuracy were proposed, based on the yield volume model, to determine the ultimate capacity in ring reinforced X-joints and plate reinforced X-joints at elevated temperatures.

Establishment of the morphological features of stab injuries to the ribs caused by a knife with a blade spine thickness of 0.1 cm

BACKGROUND: The identification of all possible parameters and features of the tool that caused the injuries is of high significance for resolving specific forensic questions in the study of stab injuries to the ribs. However, data on the influence of blade spine thickness on the morphological features of stab injuries to the ribs are lacking.&#x0D; AIM: To determine the morphological features of stab injuries caused by a knife with a blade spine thickness of 0.1 cm at various angles of impact relative to the lamellar structure of the rib.&#x0D; MATERIALS AND METHODS: Experimental works were performed. Injuries were inflicted perpendicularly to the plane of the rib, to a depth of 5.4 cm, with a knife having a blade spine thickness at the penetration level of 0.1 cm. The study analyzed the anterior sections of ribs IV–VI of individuals of both sexes, predominantly male, aged 18–59 years, which is based on an experimental literature review of cutting and stubbing injuries. In total, 60 experiments were conducted, with 20 injuries each inflicted longitudinally, obliquely, and transversely on the rib lamellar structure. The results of the macroscopic observations were recorded and considered for subsequent interpretation.&#x0D; RESULTS: In the macroscopic examination of injuries inflicted at various angles to the lines of the compact layer’s lamellar structure, linear-slit-shaped injuries were registered on the external compact plate. When oriented longitudinally in relation to the long axis of the bone, arcuate slit-shaped injuries were also observed. When a split crack was formed in the blade spine zone, a crack formed from one of the corners of the blunt end of the injury, extending longitudinally and obliquely along the bone’s lamellar structure, with some deviations toward the edge of the bone nearest to the injury. In transverse alignment of the injury to the long axis of the bone, the split crack morphologically corresponded to a fracture in bending deformation, gravitating toward the rib edge. The area influenced by the blade spine showed no macroscopic signs of abrasion of the compact or spongy bone. The blunt end of the injury had a round shape. On the internal compact plate, the shape of the injuries more frequently appeared slit-like, and in some cases serrated, due to the bulging of compact bone areas.&#x0D; CONCLUSION: The study identified significant specific morphological features of stab injuries to the ribs caused by a knife with a blade spine thickness of 0.1 cm, taking into account the lamellar structure of the bone tissue, which allows us to draw conclusions about the knife blade spine thickness.

A simplified method for thermal buckling verification in steel–concrete composite elements

This paper delivers a comprehensive analysis of the thermomechanical behavior of steel–concrete (SC) composite elements under elevated temperatures, up to 200 °C, as these can be encountered in accidental scenarios within nuclear power plant operations. The focus lies on the thermal buckling of external thin steel plates. We undertake an integrated approach, combining an experimental campaign and numerical simulations, to investigate thermal buckling phenomena. Using these findings, along with principles from thermoelasticity and thin plate theory, we establish an analytical model to guide preliminary SC element design. The efficacy of this model is ascertained through rigorous comparisons with experimental and numerical results. The paper concludes by demonstrating the model’s practical utility for thermal buckling verification through a relevant case study.

RC beams externally strengthened by steel plates: experimental database and preliminary analysis

External steel plating is a popular technique for the flexural strengthening of RC beams thanks to the ease of application which does not require skilled labor, the relatively low-cost and the optimal mechanical properties of the steel material. Research on externally plated RC beams is much older than the literature related to the strengthening methods employing fiber reinforced (FRP) materials which were more recently developed. Despite this, the number of FRP applications is far greater than those available for steel applications, as also corroborated by the widespread of several international guidelines for the FRP strengthening design of RC structures. Conversely, the in-situ applications with steel plates are still very common and often preferred to FRPs, but they are not well supported by clear design indications. This paper contributes to filling this knowledge gap by presenting the results of a preliminary study on the flexural performance of steel-plated RC beams. A large experimental database was compiled from the literature, which includes three/four- point bending tests performed on RC members variably reinforced with external steel plates. The database is in-depth examined by considering the following main parameters: layout of the external steel plating, shape of beam’s cross section, mechanical percentages of both external steel plate and beam’s longitudinal steel reinforcement in tension, and failure mode. The collected data is useful for a theoretical study on beams’ flexural performance, which is under preparation.

Temperature fields analysis and heat dissipation structure design of an film capacitor in new energy vehicle

The high-temperature resistance performance of film capacitors in motor controllers faces greater challenges with the development of high voltage and high power density of new energy vehicles (NEVs). In this study, a typical film capacitor is taken as the object of research; simulations of temperature fields and experiments on temperature rises are conducted. Additionally, a heat dissipation structure is designed to enhance the high-temperature resistance performance of the capacitor. Firstly, the temperature field distributions of the capacitor under different ripple currents and ambient temperatures are analyzed using ANSYS electro-thermal coupling simulation. Then, under the same operating conditions, experiments on the temperature rises are conducted on the capacitor, which is installed with K-type thermocouples to verify the accuracy of the electro-thermal coupling simulation. Furthermore, an external heat dissipation structure consisting of a micro-channel liquid cold plate is designed for the capacitor, and the effectiveness of the external cold plate is verified through electro-thermal coupling and FLUENT simulations. It is found that under the operating conditions of 85 ?C ambient temperature and 175 A ripple current, the maximum temperature of the capacitor with the external cold plates decreases by 46.08% compared to the original capacitor. The results indicate that the external cold plates effectively improve the high-temperature resistance capability of the film capacitors in electric vehicles.

Hypospadias with Intact Prepuce: A Spectrum of Anomalies and their Reconstruction.

The aim of the study was to perform a detailed analysis of the clinical characteristics of megameatus with intact prepuce (MIP) and to audit our results of reconstructive surgeries on MIP. Design: Retrospective analysis. Setting: Pediatric surgery department of tertiary level. Subjects, methods: Hospital records and pictures of MIP operated over a 9-year period. Age, size of penis, circumcised or not, shape of glans, external urethral meatus (EUM), urethral plate (UP), chordee, distal urethra, reconstructive surgery, and complications were analyzed. Postoperative result was objectively assessed by Hypospadias Objective Scoring Evaluation (HOSE). Twelve of 254 hypospadias were MIP (incidence = 4.72%). The mean age at operation was 38.25 months (12-87 m). Patients sought circumcision or surgical correction of anomaly. Two patients were precircumcised. MIP was coronal 7, subcoronal 3, and glanular 2. Meatus was wide in 10 and normal in 2. Glans penis was wide in 9 and conical in 3. UP was wide (9), moderately wide (2), or narrow and shallow (1). In two cases of wide deep UP, distal septum was present. Distal urethra was nondilated in all but 1, which had megalourethra. Reconstructive surgery was Tubularized Urethral Plate Urethroplasty (7 cases) or classical Snodgrass (Tubularised incised plate urethroplasty (TIPU), with superimposed vascular dartos flap (5 cases). The megalourethra underwent partial excision and TIPU. Distal UP-septum was incised. Urethral injury (2 cases) and UP injury (1 case) were intraoperative complications. One postoperative complication (ventral glans necrosis) resulted. The mean follow-up period was 4.79 months (1-12 m). In the postoperative follow-up, 11 (92%) had HOSE score 14-16, whereas one had HOSE 13. Some hypospadias cases which have intact prepuce have no megameatus; hence, they cannot be termed MIP. All cases of hypospadias having intact prepuce can be covered by the umbrella term "Hypospadias with Intact Prepuce (HIP);" MIP is a large subgroup under HIP. HIP presents with a spectrum of anomalies of glans, EUM, and UP. Repair by tubularization of UP without or with midline incision gives excellent results.

Distributed Optical Fiber-Based Monitoring of Smart Passive Anchors for Soil Stabilization

Geotechnical structures, such as piles and anchors, play a critical role in providing stability and support in a wide range of civil engineering applications. Ensuring the integrity and safety of these structures and reliably understanding their structural behavior are of paramount importance. This paper explores the application of distributed fiber optic sensors (DFOS) as a cutting-edge technology for monitoring the performance and health of passive composite anchors for soil stabilization. These anchors comprise a conventional carbon steel self-drilling bar with one or more embedded harmonic steel tendons, cemented within the central cavity of the bar. The system is finalized by an external plate for securing the bar and a protective cover for safeguarding the tendon head. Within this context, DFOS technology offers a non-invasive and cost-effective solution for real-time monitoring of various parameters, such as strain and temperature, along the entire length of the fiber optic cable. This technology enables continuous, high-resolution monitoring data collection, providing a comprehensive understanding of the long-term behavior of this specific geotechnical structure. The capability of DFOS to provide spatially distributed information facilitates the detection of localized stress concentrations and deformation patterns. The paper covers some practical considerations, such as installation techniques, data analysis and preliminary results on recently case study. The limitations and challenges associated with DFOS technology in geotechnical applications will be also discussed, including the need for specialized expertise in interpreting the data, the potential for signal attenuation in long cables and the particular care that these sensors require during cable installation and management.

Percutaneous TENS in Pediatric diaphyseal femoral fractures- Respects biology and ends happily

Femoral shaft fractures are amongst the most common major pediatric injuries treated by orthopaedic surgeons. They represent 1-2% of all fractures in the paediatric population. Paediatric males are affected more commonly than females. [1] There are various methods available for operative stabilization of paediatric femoral shaft fractures, which include external fixation, compression plating and rigid and flexible intramedullary nailing. [2] There is no uniform consensus on the treatment modality for femoral shaft fracture in school-aged children between 6 years to16 years. Titanium elastic nailing system (TENS) is a recent and widely used technique which allows stable reduction, maintenance of reduction and early mobilization. [3] American Academy of Orthopaedic Surgeons (AAOS) recommends with strong evidence based support in favour of the use of flexible intramedullary nailing for treating children age five to eleven years diagnosed with diaphyseal femur fractures. [4, 5] This device exploits a child’s denser bone, rapid healing and ability to remodel during period of bone growth. Here, we establish this axiom by a detailed case presentation, who was successfully treated with flexible intramedullary nailing for diaphyseal fracture of the femur.

Lubrication characteristics of valve plate pair of balanced large flow pump based on elastic deformation

In this paper, the balanced large flow pump is taken as the research object. Considering the elastic deformation of the surface of the valve plate pair, the oil film dynamic model and the power loss model of valve plate pair are established, and the influence of different working conditions on the lubrication characteristics of valve plate pair is analyzed. The results show that the oil film parameters and performance parameters of valve plate pair change periodically. The power loss of valve plate pair is mainly viscous friction power loss, and the leakage power loss is small; considering the elastic deformation, the viscous friction power loss is reduced by 2.73 %–3.61 %, and the leakage power loss is increased by 21.8 %–25.3 %. The increase of working pressure and rotating speed will increase friction and leakage power loss. The increase of internal and external swash plate inclination will reduce the friction power loss and increase the leakage power loss. Compared with the traditional single-row axial piston pump, the viscous friction torque of the balance pump decreases and the leakage increases, but the total power loss decreases, which makes the balance pump more efficient than the traditional pump.

Exploring the frontal recess: Specimens, endoscopy, and CT perspectives

Abstract The frontal sinus, situated between the external and internal plates of the frontal bone, posterior to the brow ridges, is the most superior and complex structure within the paranasal sinuses. The frontal sinus outflow tract encompasses two parts: the frontal ostium superiorly and the frontal recess inferiorly, collectively forming the frontal sinus drainage pathway. The frontal recess represents the most anterosuperior portion of the ethmoid. Pneumatization of this area can extend from the agger nasi cell anteriorly to the ethmoidal bulla posteriorly. This recess is bounded by the orbital plate of the ethmoid laterally and the middle nasal concha (‘middle turbinate’) medially. The detailed understanding of frontal sinus anatomy is indispensable for medical professionals, including surgeons, otolaryngologists, rhinologists, and radio-logists. The frontal recess is clinically important, especially in the diagnosis and management of various medical conditions, particularly sinusitis. Surgeons often need to navigate this intricate area. Radiological imaging, such as computed tomography (CT) scans, is frequently employed to evaluate the frontal sinus and its drainage pathway, enabling clinicians to identify abnormalities such as tumors, polyps, or foreign bodies. In this study, we investigated the anatomical intricacies of the frontal recess using specimens, CT scans, and endoscopic imagery sourced from didactic and clinical settings.

Percutaneous elastic-dynamic fixation for the treatment of volar displaced distal radius fractures. A solution for elderly patients?

&amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;Aim&amp;lt;/strong&amp;gt; &amp;lt;br /&amp;gt;The Epibloc elastic-dynamic fixation has been applied for many years at several hand surgery centres in Italy. This technique has been considered safe and reliable in the treatment of distal meta-epiphyseal fractures of the radius with dorsal displacement. The aim of this study was to evaluate an alternative use of this method in the treatment of volar displaced wrist fractures in cases where an internal fixation could not be recommended.&amp;lt;br /&amp;gt;&amp;lt;strong&amp;gt;Methods &amp;lt;/strong&amp;gt;&amp;lt;br /&amp;gt;The procedure consisted of two flexible pins with a trocar tip and an external plate for locking fixation with compression.&amp;lt;br /&amp;gt;The surgical technique was derived from the original procedure, modifying the placement of the pins and performing small surgical accesses to preserve the neuro-vascular structures of the volar aspect of the wrist. To achieve and preserve the reduction of the volar fragment, a third pin was inserted into the fracture with a similar procedure to Kapandji&amp;#039;s reduction technique.&amp;lt;br /&amp;gt;&amp;lt;strong&amp;gt;Results&amp;lt;/strong&amp;gt; &amp;lt;br /&amp;gt;At three-month follow-up, most patients did not experience any pain. In 14 cases, the strength grip was recovered between 75% and 90%, compared to the contralateral hand (Jamar test). In 15 patients, the wrist range of motion was restored with values greater than 100. In 17 cases, forearm pronation-supination was restored to more than 120&amp;amp;deg;.&amp;lt;br /&amp;gt;&amp;lt;strong&amp;gt;Conclusion&amp;lt;/strong&amp;gt; &amp;lt;br /&amp;gt;In cases of non-comminuted, one or two fragments volar displaced wrist fractures, the elastic-dynamic fixation associated with an intrafocal pinning reduction may be proposed as an alternative to open reduction and internal fixation in elderly&amp;lt;br /&amp;gt;patients.&amp;lt;/p&amp;gt;