For more information, please refer to our privacy > january 2005 - volume 19 - issue 1 > an alternative method of osteosynthesis for distal humeral s... The automatically generated screw modelling offers a realistic simulation of the osteosynthesis fixation with screws in the adjacent bone stock and can be used for further on: wieding j, souffrant r, fritsche a, mittelmeier w, bader r (2012) finite element analysis of osteosynthesis screw fixation in the bone stock: an appropriate method for automatic screw modelling. Furthermore, the importance of an appropriate fixation technique, exemplarily in case of large contact areas between bone and implant, has been als and ting finite element models of a composite femur (4th generation large left, sawbone europe ab, malmö, sweden) and an angular-stable osteosynthesis plate (ncb®, zimmer gmbh, freiburg, germany) were generated from ct data with an approximate voxel size of 0.
Translational dof of all screw head nodes were bonded to the nodes of the corresponding holes of the plate representing an angular-stable last fixation method used structural elements to model the screw and the connection to the three-dimensional fe elements of the bone (case c: model a, t10 and case d: model c, h8 mesh) furthermore, abaqus/cae offers the possibility to automatise processes by a scripting interface, which uses the higher-level program language python. 5exemplified x-rays of a 79 yo female patient with late avn post bone union after bdsf treatment: ap view diagnostics (a), postoperative ap view (b), postoperative lateral view (c), ap view 10-month follow-up with bone union (d) and 24-month follow-up with late avn (e)femoral neck fracture osteosynthesis by the biplane double-supported screw fixation method (bdsf) reduces the risk of fixation failure: clinical outcomes in 207 patientsarch orthop trauma surg. Hence this numerical model using hexahedral elements is suitable to be used for further numerical investigations and the developed method can be used for the screw generation in arbitrary fe the results showed good agreement between experimental testing and numerical analysis this kind of screw modelling approach and the ct-based material distribution can be also used for patient-specific human bones with sufficient addition, more complex physiological boundary conditions can be investigated, e.
To the different screw modelling and fixation techniques, meshing procedure of the femur was performed in three work steps using mainly the fe software package abaqus (version 6. Stress distribution within the area between the bone and the osteosynthesis s are shown on the surface of the bone (marked with red rectangle on the right). Relative displacement between the bone and osteosynthesis system is still enabled and loading forces are induced via the screws into the , there is the advanced approach, in our point of view, which implies the usage of structural elements, i.
The zespol system enables a surgeon to perform compression, neutralization (protecting) contact, and bridging osteosynthesis. The fact, that this method could be used without considering the screw holes and mesh densities of the contact area during the meshing process is the major benefit of this technique. Osteosynthesis plate and structural model of the osteosynthesis plate and the seven generated screws (a) (view from anterior, see (b) and (c) for detailed illustration).
The described method can therefore be used to create screws parameterised only by few parameters, e. In general, these results suggest that the use of tie fixation techniques leads to inadequate displacements when used with large contact areas and might be an acceptable method for small contact areas with only small deformations. Exemplarily, fixation was performed for stabilization of a large segmental femoral bone defect by an osteosynthesis plate.
Commentshow to join pubmed commonshow to cite this comment:Ncbi > literature > wikipedia, the free to: navigation, ular fracture, 6 months after osteosynthesis with plate and screw fracture, osteosynthesis with an intramedullary locking -epiphysiolysis, osteosynthesis with fracture, before surgery and 5 month later with ynthesis is the reduction and internal fixation of a bone fracture with implantable devices that are usually made of metal. In addition, this method was compared to experimental testing and other frequently used modelling approaches. Breast cancer" her2 smith ecmes [centro-medullary elastic stabilising wiring) osteosynthesis method in limb fractures in children.
Hospital graubuenden, chur, ctintroduction: osteosynthesis of femoral neck fractures is related up to 46% rate of complications. Osteosynthesis aims to bring the fractured bone ends together and immobilize the fracture site while healing takes place. Therefore, it is a common method in mechanical engineering and gains more and more influence in rmore, interactions of the plate-screw-bone composite could be implemented and analyzed in computational simulations –, whereat fixation of osteosynthesis implants like plates or nails to the bone stock can basically be considered with three different numerical , there is the simple approach to fix an implant directly to the bone by a tied contact .
Segmental defect is bridged with an osteosynthesis system on the lateral (outer) side and fixed with seven titanium screws. Angular stable fixation of the screw heads to the nodes of the osteosynthesis plate (b) (view from lateral). For this reason, modelling of screws in conjunction with the use of osteosynthesis systems and big contact areas is highly ning the presence of screws our fe simulations showed a good agreement between numerical results and the experimental testing.
This study we described the accuracy of different numerical techniques to consider the fixation of an osteosynthesis implant to the bone stock in comparison to experimental testing. Screw radius, length, orientation, amount of screws in combination with different osteosynthesis systems can be investigated in order to give clinically relevant s the different types of screw modelling, we could also show the influence of the element type used for the meshing of the femur (hexahedral versus tetrahedral). Toni1998a comparative study on different methods of automatic mesh generation of human eng k, viceconti m, o'connor jj (2001) a comparison between automatically generated linear and parabolic tetrahedra when used to mesh a human femur.
2exemplified x-rays of a 51 yo female patient with bone union (successful healing with fracture consolidation) after bdsf treatment: ap view diagnostics (a), postoperative ap view (b), postoperative lateral view (c), ap view 6-month follow-up (d) and ap view 55-month follow-up (e)femoral neck fracture osteosynthesis by the biplane double-supported screw fixation method (bdsf) reduces the risk of fixation failure: clinical outcomes in 207 patientsarch orthop trauma surg. Krenkel20093d-fem and histomorphology of mandibular reconstruction with the titanium functionally dynamic bridging j oral maxillofac nti m, bellingeri l, cristofolini l, toni a (1998) a comparative study on different methods of automatic mesh generation of human femurs. This is associated with immediate proximity of the radial nerve and risk of iatrogenic injury in external fixation, presence of short distal fragment, comminuted nature of fracture, complexity of treatment method selection, need of extensible approach.