scholarly journals Construction and Biomechanical Properties of PolyAxial Self-Locking Anatomical Plate Based on the Geometry of Distal Tibia

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Weiguo Liang ◽  
Weixiong Ye ◽  
Dongping Ye ◽  
Ziqiang Zhou ◽  
Zhiguang Chen ◽  
...  
Keyword(s):  
Locking Plate ◽  
Distal Tibia ◽  
Three Dimensional ◽  
Axial Loading ◽  
Spiral Ct ◽  
Biomechanical Properties ◽  
Fresh Cadaver ◽  
Plate Stability ◽  
Locking Screw ◽  
Biomechanical Tests

In order to provide scientific and empirical evidence for the clinical application of the polyaxial self-locking anatomical plate, 80 human tibias from healthy adults were scanned by spiral CT and their three-dimensional images were reconstructed using the surface shaded display (SSD) method. Firstly, based on the geometric data of distal tibia, a polyaxial self-locking anatomical plate for distal tibia was designed and constructed. Biomechanical tests were then performed by applying axial loading, 4-point bending, and axial torsion loading on the fracture fixation models of fresh cadaver tibias. Our results showed that variation in twisting angles of lateral tibia surface was found in various segments of the distal tibia. The polyaxial self-locking anatomical plate was constructed based on the geometry of the distal tibia. Compared to the conventional anatomical locking plate, the polyaxial self-locking anatomical plate of the distal tibia provides a better fit to the geometry of the distal tibia of the domestic population, and the insertion angle of locking screws can be regulated up to 30°. Collectively, this study assesses the geometry of the distal tibia and provides variable locking screw trajectory to improve screw-plate stability through the design of a polyaxial self-locking anatomical plate.

The biomechanics of combined lateral and posterior plates for treating proximal humerus fractures with medial column defects

2020 ◽  
Author(s):  
Xuedong Zhang ◽  
YueChao Dou ◽  
Xuefei Wang ◽  
Jianxiong Ma ◽  
Bin Lu ◽  
...  
Keyword(s):  
Locking Plate ◽  
Proximal Humerus ◽  
Three Dimensional ◽  
Biomechanical Properties ◽  
Proximal Humerus Fractures ◽  
Dimensional Finite Element ◽  
Philos Plate ◽  
Humerus Fractures ◽  
Three Dimensional Finite Element

Abstract Background. We investigated the therapeutic effects associated with the combined use of lateral and posterior plates for treating complex proximal humerus fractures. Methods. We used in vitro biomechanical experiments and computer three-dimensional finite element analyses to investigate the biomechanical properties of combined lateral and posterior plates when treating proximal humerus fractures. Eighteen left SAWBONE (Pacific Research Labs) humerus bones were randomly divided among three groups. We established a medial column defect model for surgical neck fractures in each bone specimen and achieved fixation using a proximal humerus locking plate. Each of the three groups used a different fixation method. Group A used a Proximal Humerus Internal Locking System (PHILOS) plate support only. Group B used the PHILOS plate with a posterior locking plate (but without medial column support screws). Group C used the PHILOS plate with both the posterior locking plate and medial column support screws. We subjected three sets of specimens to axial compression, torsion, shear compression, model failure, fatigue testing, and micro-strain analyses. Results and conclusions. In vitro biomechanical analysis and three-dimensional finite element analyses showed that the PHILOS plate, in combination with the posterior locking plate and medial column support screws (Group C), had significantly enhanced biomechanical properties when compared with traditional single plate supports.

scholarly journals Biomechanical evaluation of axial-loading simulated experiment in wrist fractures: a finite element analysis

2020 ◽  
Vol 48 (10) ◽  
pp. 030006052096688
Author(s):  
You-Liang Fan ◽  
Hai-Yun Xu ◽  
Ming-Yang Xia ◽  
Wen Zhang ◽  
Hui-Long Wen ◽  
...  
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Axial Loading ◽  
Element Model ◽  
Biomechanical Properties ◽  
Wrist Fracture ◽  
Control Group ◽  
Element Analysis ◽  
Obvious Effect ◽  
Experimental Group

Objective To assess the biomechanical properties that influence wrist fracture, so as to provide the theoretical basis for simulation experiments to aid the optimal design of wrist protectors. Methods Six cadaveric wrists were included as experimental specimens. Wrist specimens wearing wrist protectors formed the experimental group and unprotected wrist specimens formed the control group. The wrist specimens were axially loaded under physiological loads and the stress magnitude and distribution of the experimental and control groups were obtained. A three-dimensional wrist finite element model of a healthy volunteer was developed to verify the rationality and effectiveness of the cadaveric wrist models. Results Under normal physiological loads, the stress on the radioulnar palmar unit was high and manifested in the form of pressure, while the stress on the radioulnar dorsal unit was lower and manifested in the form of tension. The stresses on the radial distal palmar, ulnar distal palmar, radial distal dorsal, ulnar distal dorsal, radial proximal palmar and ulnar proximal palmar units in the experimental group were less than those in the control group. Conclusion Under physiological loads, wearing a wrist protector can reduce the stress on the radioulnar distal palmar, radioulnar proximal palmar and radioulnar distal dorsal units, while having no obvious effect on the radioulnar proximal dorsal units.

Three dimensional visualization with Spiral CT

1993 ◽  
Vol 28 (12) ◽  
pp. 1215
Author(s):  
Tello R. ◽  
Dupuy D. E. ◽  
Costello P. ◽  
S. Dudak
Keyword(s):  
Three Dimensional ◽  
Spiral Ct

scholarly journals Three-dimensional locking plate and conventional miniplates in the treatment of mandibular anterior fractures

2018 ◽  
Vol 8 (1) ◽  
pp. 73 ◽  
Author(s):  
NilimaJ Budhraja ◽  
RamakrishnaS Shenoi ◽  
SampratiJ Badjate ◽  
KshitijO Bang ◽  
PranavD Ingole ◽  
...  
Keyword(s):  
Locking Plate ◽  
Three Dimensional
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