Deformation Analysis of Internal Fixation Plate on Femur Bone Fracture: A Study Case on Local Raw

2020 ◽  
Vol 867 ◽  
pp. 196-203
Author(s):  
Achmad Syaifudin ◽  
Djoko Kuswanto ◽  
Teguh Hari Prasetyo
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Internal Fixation ◽  
Bone Healing ◽  
Bone Fracture ◽  
Healing Process ◽  
Material Type ◽  
Femur Bone ◽  
Implant Material ◽  
Fixation Plate

In the case of femur bone fracture, internal fixation is usually applied for the treatment due to the convenience and amenities of follow-up care. Due to a high demand for internal fixation implants in Indonesia, causing Pelopor Teknologi Implantindo Inc. (PTI Inc., Mojokerto - Indonesia) produces conventional implant material made from annealed local raw material of 316L stainless steel, with a yield strength of 317 MPa and ultimate tensile strength of 580 MPa. Compared to implant material in ASTM F138, it has a little higher value of both yield and ultimate tensile strength. To determine the effects of material type, normal stresses will be used to evaluate the fractured bone, while von Mises stresses will be used to analyze the strength of fixation plate. Besides, influence of material variation to the bone healing process is also discussed. Transversal-type fracture is chosen for fracture modeling of femoral shaft. The loading is taken from body weight of Asians, which is applied at femur head. The simulation result indicates that in the case of conventional fixation plate, there is no significant influence on the bone healing caused by different material type.

Mechanical Failure of Angle Locking Plates in Distal Comminuted Tibial Fractures

2016 ◽  
Vol 695 ◽  
pp. 118-122 ◽  
Author(s):  
Razvan Ene ◽  
Zsombor Panti ◽  
Mihai Nica ◽  
Marian Pleniceanu ◽  
Patricia Ene ◽  
...  
Keyword(s):  
Internal Fixation ◽  
Bone Healing ◽  
Tibial Fracture ◽  
Weight Bearing ◽  
Healing Process ◽  
Biomechanical Properties ◽  
Implant Failure ◽  
Locking Plates ◽  
Non Union ◽  
Tibial Pilon

Distal comminuted tibial fracture with or without intra-articular involvement is a very common injury of the lower limb, especially in younger patients due to high energy trauma. The anatomical and biomechanical properties of this segment of tibia, makes this pathology a major surgical challenge with a preserved clinical outcome. The aim of this study is to present different outcome of tibial fracture, treated with open reduction and internal fixation (ORIF) with titanium angle locking plates (ALP) and to underline the physiological and non-physiological bone healing effects on implants. In this study we included 48 patients with tibial pilon fracture who underwent to ORIF, applying ALP in the Orthopedics and Trauma department of the University Emergency Hospital in Bucharest. Due to preserved biomechanical properties of ALP and this anatomical region, weight bearing is not allowed till 6 to 8 weeks. Comminuted fracture of this part of tibia often have de-vascularized bony fragments which leads to delayed union or non-union. These complications often lead to implant failure, improper bone healing or non-union. Internal fixation with angle stable screws, offers a good stability of reduction in the early postoperative period. Titanium angle locking plates offers good anatomical reduction and stable fixation in the early period of healing process. Due to its rigid, fixed position of the screws in the plates, bone remodelling during healing process and early weight bearing, increases the mechanical failure of implant.Keywords: tibial pilon fractures, angle locking plates, implant failure.

scholarly journals Influence of high-frequency cyclical stimulation on the bone fracture-healing process: mathematical and experimental models

2011 ◽  
Vol 369 (1954) ◽  
pp. 4278-4294 ◽  
Author(s):  
María José Gómez-Benito ◽  
Libardo Andrés González-Torres ◽  
Esther Reina-Romo ◽  
Jorge Grasa ◽  
Belén Seral ◽  
...  
Keyword(s):  
Fracture Healing ◽  
Bone Healing ◽  
Mechanical Stimulation ◽  
Bone Fracture ◽  
High Frequency ◽  
Endochondral Ossification ◽  
Healing Process ◽  
Bone Fracture Healing ◽  
Bone Healing Process ◽  
Low Magnitude

Mechanical stimulation affects the evolution of healthy and fractured bone. However, the effect of applying cyclical mechanical stimuli on bone healing has not yet been fully clarified. The aim of the present study was to determine the influence of a high-frequency and low-magnitude cyclical displacement of the fractured fragments on the bone-healing process. This subject is studied experimentally and computationally for a sheep long bone. On the one hand, the mathematical computational study indicates that mechanical stimulation at high frequencies can stimulate and accelerate the process of chondrogenesis and endochondral ossification and consequently the bony union of the fracture. This is probably achieved by the interstitial fluid flow, which can move nutrients and waste from one place to another in the callus. This movement of fluid modifies the mechanical stimulus on the cells attached to the extracellular matrix. On the other hand, the experimental study was carried out using two sheep groups. In the first group, static fixators were implanted, while, in the second one, identical devices were used, but with an additional vibrator. This vibrator allowed a cyclic displacement with low magnitude and high frequency (LMHF) to be applied to the fractured zone every day; the frequency of stimulation was chosen from mechano-biological model predictions. Analysing the results obtained for the control and stimulated groups, we observed improvements in the bone-healing process in the stimulated group. Therefore, in this study, we show the potential of computer mechano-biological models to guide and define better mechanical conditions for experiments in order to improve bone fracture healing. In fact, both experimental and computational studies indicated improvements in the healing process in the LMHF mechanically stimulated fractures. In both studies, these improvements could be associated with the promotion of endochondral ossification and an increase in the rate of cell proliferation and tissue synthesis.

scholarly journals An Overview of Drug Effects on Bone Healing on Animal Research Models

2021 ◽  
Vol 4 (1) ◽  
pp. 978-988
Author(s):  
Nguyen Hoai Nam ◽  
Naruepon Kampa
Keyword(s):  
Bone Healing ◽  
Bone Fracture ◽  
Health Problem ◽  
Direct Evidence ◽  
Healing Process ◽  
Drug Effects ◽  
Chemotherapeutic Drugs ◽  
Complicated Process ◽  
Inflammatory Drugs ◽  
Affect Bone Healing

Bone fracture is a common health problem in humans and animals, and the healing of the bone fracture is a complicated process. Several drugs may be used concurrently with the treatment of fractures, but they may interfere with the healing process of the bone. The present research reviewed previously published studies with the objective to enhance the understandings of the effects of different drugs on bone healing. There is clear evidence that antibiotics, corticosteroids, non-steroidal inflammatory drugs, and chemotherapeutic drugs all affect bone healing. By contrast, the effect of anticoagulants on bone healing is controversial, so more research is needed to determine its efficacy. In addition, there is no direct evidence to approve the effect of anesthetics on bone healing, so this is another area in need of further research.

Biomechanics of Internal Fixation Modalities for Middle Phalangeal Base Fracture Dislocation

2017 ◽  
Vol 22 (01) ◽  
pp. 14-17 ◽  
Author(s):  
Gen-Lin Foo ◽  
Amit K. Ramruttun ◽  
Andre Eujin Cheah ◽  
Alphonsus Kin-Sze Chong ◽  
Tun-Lin Foo
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Yield Strength ◽  
Internal Fixation ◽  
Articular Surface ◽  
Proximal Interphalangeal Joint ◽  
Fracture Dislocation ◽  
Skin Envelope ◽  
Strength And Stiffness ◽  
Buttress Plate

Background: Internal fixation modalities of unstable (>50 percent articular involvement) middle phalangeal volar lip fracture-dislocations include interfragmentary screw and volar buttress plating. This study investigates the mechanical properties (yield strength, ultimate tensile strength, and stiffness) of interfragmentary screw (IS), simple buttress plating (BP) and buttress plating with subchondral screw (BP+S). Methods: Fifteen cadaveric digits (5 index, 5 middle, and 5 ring) were prepared by excising its skin envelope and flexor tendons while preserving the structures around the proximal interphalangeal joint. An oblique osteotomy involving 50 percent of the articular surface was performed, and this was fixed with based on its study group: interfragmentary screw (IS), simple buttress plating (BP) and buttress plating with subchondral screw (BP+S). These specimens were then loaded to failure. Results: Yield strength was as follows: BP+S (33.5±9.76 N), IS (13.6±5.46 N), and BP (8.1±3.84 N). Ultimate tensile strength was as follows: BP+S (49.1±21.4 N), IS (15.6±5.19 N), and BP (8.86±3.99 N). Stiffness was as follows: BP+S (4.77±1.32 N/mm), IS (2.44±0.86 N/mm), and BP (1.84±0.71 N/mm). Conclusions: A buttress plate and screw construct confers significantly more stability than either interfragmentary screw or buttress plate only fixation in an experimental model.

An appraisal of characteristic mechanical properties and microstructure of friction stir welding for Aluminium 6061 alloy – Silicon Carbide (SiCp) metal matrix composite

2019 ◽  
Vol 13 (4) ◽  
pp. 5804-5817
Author(s):  
Ibrahim Sabry
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Welded Joint ◽  
Rotation Speed ◽  
Fusion Welding ◽  
Friction Stir ◽  
Al 6061

It is expected that the demand for Metal Matrix Composite (MMCs) will increase in these applications in the aerospace and automotive industries sectors, strengthened AMC has different advantages over monolithic aluminium alloy as it has characteristics between matrix metal and reinforcement particles.  However, adequate joining technique, which is important for structural materials, has not been established for (MMCs) yet. Conventional fusion welding is difficult because of the irregular redistribution or reinforcement particles.  Also, the reaction between reinforcement particles and aluminium matrix as weld defects such as porosity in the fusion zone make fusion welding more difficult. The aim of this work was to show friction stir welding (FSW) feasibility for entering Al 6061/5 to Al 6061/18 wt. % SiCp composites has been produced by using stir casting technique. SiCp is added as reinforcement in to Aluminium alloy (Al 6061) for preparing metal matrix composite. This method is less expensive and very effective. Different rotational speeds,1000 and 1800 rpm and traverse speed 10 mm \ min was examined. Specimen composite plates having thick 10 mm were FS welded successfully. A high-speed steel (HSS) cylindrical instrument with conical pin form was used for FSW. The outcome revealed that the ultimate tensile strength of the welded joint (Al 6061/18 wt. %) was 195 MPa at rotation speed 1800 rpm, the outcome revealed that the ultimate tensile strength of the welded joint (Al 6061/18 wt.%) was 165 MPa at rotation speed 1000 rpm, that was very near to the composite matrix as-cast strength. The research of microstructure showed the reason for increased joint strength and microhardness. The microstructural study showed the reason (4 %) for higher joint strength and microhardness.  due to Significant   of SiCp close to the boundary of the dynamically recrystallized and thermo mechanically affected zone (TMAZ) was observed through rotation speed 1800 rpm. The friction stir welded ultimate tensile strength Decreases as the volume fraction increases of SiCp (18 wt.%).

VASCO 9-4-20

Alloy Digest ◽  
1997 ◽  
Vol 46 (10) ◽  
Keyword(s):  
Fracture Toughness ◽  
Tensile Strength ◽  
High Temperature ◽  
Ultimate Tensile Strength ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
High Tensile Strength ◽  
Temperature Performance

Abstract Vasco 9-4-20 (0.20 wt% C) is a premium quality aircraft steel that combines high tensile strength with good fracture toughness. It is a heat-treatable alloy capable of developing an ultimate tensile strength greater than 190 ksi. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance as well as heat treating, machining, and joining. Filing Code: SA-489. Producer or source: Vasco, An Allegheny Teledyne Company.

Sign in / Sign up

Export Citation Format

Share Document