scholarly journals Use of external fixation devices for optimization of reparative regeneration in pelvic bone fractures

1996 ◽  
Vol 3 (1) ◽  
pp. 52-56
Author(s):  
D. I. Cherkes-Zade ◽  
A. F. Lazarev
Keyword(s):  
External Fixation ◽  
Bone Fractures ◽  
Bed Rest ◽  
Reparative Regeneration ◽  
Pelvic Bone ◽  
Pelvic Bones ◽  
Fixation Devices

The authors present their experience in the application of external fixation devices for the treatment of 96 patients with multiple and combined pelvic bones injuries. It is shown that treatment with use of both pivot and pin devices exerts powerful antishock effect, allows to shorten the duration of bed rest and early activate the patient. Favourable results were achieved in all cases.

Analysis of the lower jaw exoskeleton in finite element programs

2021 ◽  
pp. 88-92
Author(s):  
D. Yu. D’yachenko ◽  
A. A. Vorob’ev ◽  
Iu. A. Makedonova ◽  
О. N. Kurkina ◽  
S. V. D’yachenko ◽  
...  
Keyword(s):  
Finite Element ◽  
External Fixation ◽  
3D Model ◽  
Bone Fractures ◽  
Maxillofacial Region ◽  
Lower Jaw ◽  
Fixation Devices ◽  
Bone Fragments ◽  
External Fixation Device ◽  
Medical University

A special place in the methods of surgical treatment of bone fractures is occupied by transosseous osteosynthesis using external fixation devices of various designs.Objective: to analyze the lower jaw exoskeleton in finite element programs.Materials and research methods. During the research, 36 human lower jaws were involved from the museum of the Department of Oper-ative Surgery and Topographic Anatomy of the Volgograd State Medical University. They were scanned in 3D. All obtained images were loaded into a virtual scene reconstruction program. Fractures of the lower jaws in the corner area were modeled, an apparatus for external fixation of the lower jaw exoskeleton was installed, and the chewing load on the lower jaw was simulated. The place of application of the force was an area on a small fragment of a repositioned 3D model of the mandibular bone corresponding to the place of attachment of the masseter muscle. The evaluation of virtual studies was carried out according to the results of the stress-strain states of the bones and apparatus, the schedule of displacements of objects and the results of the analysis of the safety factor.Research results and discussion. In the course of evaluating the virtual placement of the mini-fixator wires of the apparatus for external fixation of the lower jaw exoskeleton, it was revealed that the main load is applied to the mini-fixator wires on a large fragment and the bone in the area of the wires. For the possibility of precise positioning of the osteofixers of the external fixation device, a device for the safe installation of the spokes of the lower jaw exoskeleton was also developed.Conclusion. Thus, on the basis of computer mathematical analysis, it can be argued that the developed design of the apparatus for external fixation of the lower jaw exoskeleton works under conditions of the maxillofacial region, performs reposition and fixation of bone fragments of the lower jaw under conditions of chewing functioning of the restored fracture of the lower jaw.

scholarly journals Optimization of a Patient-Specific External Fixation Device for Lower Limb Injuries

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2661
Author(s):  
Mohammed S. Alqahtani ◽  
Abdulsalam Abdulaziz Al-Tamimi ◽  
Mohamed H. Hassan ◽  
Fengyuan Liu ◽  
Paulo Bartolo
Keyword(s):  
Topology Optimization ◽  
External Fixation ◽  
Polylactic Acid ◽  
External Fixator ◽  
Bone Fractures ◽  
Healing Process ◽  
Patient Specific ◽  
External Fixators ◽  
Fixation Devices ◽  
Limb Injuries

The use of external fixation devices is considered a valuable approach for the treatment of bone fractures, providing proper alignment to fractured fragments and maintaining fracture stability during the healing process. The need for external fixation devices has increased due to an aging population and increased trauma incidents. The design and fabrication of external fixations are major challenges since the shape and size of the defect vary, as well as the geometry of the human limb. This requires fully personalized external fixators to improve its fit and functionality. This paper presents a methodology to design personalized lightweight external fixator devices for additive manufacturing. This methodology comprises data acquisition, Computer tomography (CT) imaging analysis and processing, Computer Aided Design (CAD) modelling and two methods (imposed predefined patterns and topology optimization) to reduce the weight of the device. Finite element analysis with full factorial design of experiments were used to determine the optimal combination of designs (topology optimization and predefined patterns), materials (polylactic acid, acrylonitrile butadiene styrene, and polyamide) and thickness (3, 4, 5 and 6 mm) to maximize the strength and stiffness of the fixator, while minimizing its weight. The optimal parameters were found to correspond to an external fixator device optimized by topology optimization, made in polylactic acid with 4 mm thickness.

The Treatment of the Pelvic Bone Fractures by Means of Hoffmann's External Skeletal Fixation Devices

1983 ◽  
Vol 18 (1) ◽  
pp. 67
Author(s):  
Jang Seok Choi ◽  
Young Goo Lee ◽  
Hyon Oh Cho ◽  
Pan Suck Kim
Keyword(s):  
Bone Fractures ◽  
Pelvic Bone ◽  
Fixation Devices

Weight-Bearing Feet Reactions at Walking in Patients with Pelvic Bone Fractures during Treatment by Transosseous Osteosynthesis

2010 ◽  
Vol 17 (2) ◽  
pp. 16-20
Author(s):  
T I Dolganova ◽  
I I Martel ◽  
V V Shevedov ◽  
D V Dolganov
Keyword(s):  
Quantitative Assessment ◽  
Stance Phase ◽  
Bone Fractures ◽  
Weight Bearing ◽  
Assistive Devices ◽  
Pelvic Bone ◽  
Stable Fixation ◽  
Adaptive Changes ◽  
Pelvic Bones ◽  
Computer Complex

Quantitative assessment of weight-bearing feet reaction at walking (computer complex DiaSled-Scan, St.Petersberg) was performed in 6 patients with pelvic bone fractures treated by transosseous osteosynthesis using Ilizarov device. In stable fixation of pelvic bones by the device the forefoot was used as additional balance when walking without assistive devices. The decrease in anterior and posterior push range which is compensated by the increase in time during one cycle of gait and its' variability should be considered as a summarizing index of adaptive changes of gait. Compensatory increase up to 40% of stance phase variability on the less involved side is preserved by 1 year after surgery.

Development of a device for safe spatial orientation of the spokes of an extra-focal osteosynthesis apparatus

2021 ◽  
pp. 93-97
Author(s):  
D. Yu. D’yachenko ◽  
A. A. Vorob’ev ◽  
Iu. A. Makedonova ◽  
О. N. Kurkina ◽  
S. V. D’yachenko ◽  
...  
Keyword(s):  
External Fixation ◽  
Spatial Orientation ◽  
Bone Fractures ◽  
3D Printer ◽  
Optimal Angle ◽  
Lower Jaw ◽  
Fixation Devices ◽  
External Fixation Device ◽  
Fixation Apparatus ◽  
External Fixation Apparatus

A special place in the methods of surgical treatment of bone fractures is occupied by transosseous osteosynthesis using external fixation devices.The aim of the study is to develop a device for the safe spatial orientation of the wires of the extrafocal osteosynthesis apparatus.Materials and methods. To develop a device for the spatial orientation of the external fixation spokes, a 3D model was designed with further reproduction on a 3D printer. The development of the device was carried out by placing the wires of the external fixation apparatus on 36 bones of the human lower jaw, on which a fracture in the angle was simulated.Results and discussion. The device for the spatial orientation of the spokes of the external fixation device for the lower jaw exoselet is partially reproduced using a 3D printer, which allows individualizing the device parts at the stages of preparation for surgery.Conclusions. Effect: control of the depth of immersion of osteofixers over the entire thickness of the bone and simplification of the choice of the optimal angle of mutual spatial orientation during their introduction and the greatest stable fixation of the fragments of the lower jaw during closed extrafocal osteosynthesis.

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