Stress at the Second Metatarsal Bone After Correction of Hammertoe and Claw Toe Deformity

2013 ◽  
Vol 103 (4) ◽  
pp. 260-273 ◽  
Author(s):  
Javier Bayod ◽  
Ricardo Becerro de Bengoa Vallejo ◽  
Marta Elena Losa Iglesias ◽  
Manuel Doblaré
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Tendon Transfer ◽  
Metatarsal Bone ◽  
Element Analysis ◽  
Claw Toe ◽  
Compressive Stresses ◽  
Second Metatarsal ◽  
Flexor Digitorum ◽  
Toe Deformity

Background: We used finite element analysis to evaluate three techniques for the correction of hammertoe and claw toe deformities: flexor digitorum longus tendon transfer (FDLT), flexor digitorum brevis tendon transfer (FDBT), and proximal interphalangeal joint arthrodesis (PIPJA). Methods: We performed a finite element analysis of FDLT and FDBT compared with PIPJA of the second toe using multislice computed tomography and 93 tomographic images of the foot obtained in a healthy 36-year-old man. Results: The PIPJA showed a significantly higher increase in traction and compressive stresses and strain at the medial aspect of the shaft of the second metatarsal bone compared with FDLT or FDBT (P < .01). Mean ± SD compressive stresses increased to −4.35 ± 7.05 MPa compared with the nonsurgical foot (−3.10 ± 4.90 MPa). It can, therefore, be hypothesized that if PIPJA is used to correct the hammertoe and claw toe deformities, it could also increase traction and compressive stresses and strain in the metatarsals during running and other vigorous activities. Conclusions: There is a biomechanical advantage to performing FDLT or FDBT instead of PIPJA to surgically treat a hammertoe or claw toe deformity. In addition, tensile strain at the dorsal aspect of the second metatarsal bone when performing PIPJA increases the risk of metatarsalgia or stress fracture in patients at risk. (J Am Podiatr Med Assoc 103(4): 260–273, 2013)

Finite-element simulation of flexor digitorum longus or flexor digitorum brevis tendon transfer for the treatment of claw toe deformity

2009 ◽  
Vol 42 (11) ◽  
pp. 1697-1704 ◽  
Author(s):  
Alberto García-González ◽  
Javier Bayod ◽  
Juan Carlos Prados-Frutos ◽  
Marta Losa-Iglesias ◽  
Kevin T. Jules ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Tendon Transfer ◽  
Flexor Digitorum Longus ◽  
Claw Toe ◽  
Element Simulation ◽  
Flexor Digitorum Brevis ◽  
Flexor Digitorum ◽  
Toe Deformity

scholarly journals Fractographical Analysis and Biomechanical Considerations of a Tooth Restored With Intracanal Fiber Post: Report of the Fracture and Importance of the Fiber Arrangements

2016 ◽  
Vol 41 (5) ◽  
pp. E149-E158 ◽  
Author(s):  
VF Wandscher ◽  
CD Bergoli ◽  
IF Limberger ◽  
TP Cenci ◽  
P Baldissara ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Glass Fiber ◽  
Shear Stresses ◽  
Fiber Post ◽  
Element Analysis ◽  
Parallel Fibers ◽  
Tooth Structure ◽  
Anterior Teeth ◽  
Compressive Stresses

SUMMARY Objective: This article aims to present a fractographic analysis of an anterior tooth restored with a glass fiber post with parallel fiber arrangement, taking into account force vectors, finite element analysis, and scanning electron microscopy (SEM). Methods: A patient presented at the Faculty of Dentistry (Federal University of Santa Maria, Brazil) with an endodontically treated tooth (ETT), a lateral incisor that had a restorable fracture. The treatment was performed, and the fractured piece was analyzed using stereomicroscopy, SEM, and finite element analysis. Results: The absence of remaining coronal tooth structure might have been the main factor for the clinical failure. We observed different stresses actuating in an ETT restored with a fiber post as well as their relationship with the ultimate fracture. Tensile, compression, and shear stresses presented at different levels inside the restored tooth. Tensile and compressive stresses acted together and were at a maximum in the outer portions and a minimum in the inner portions. In contrast, shear stresses acted concomitantly with tensile and compressive stresses. Shear was higher in the inner portions (center of the post), and lower in the outer portions. This was confirmed by finite element analysis. The SEM analysis showed tensile and compression areas in the fiber post (exposed fibers=tensile areas=lingual surface; nonexposed fibers=compression areas=buccal surface) and shear areas inside the post (scallops and hackle lines). Stereomicroscopic analysis showed brown stains in the crown/root interface, indicating the presence of microleakage (tensile area=lingual surface). Conclusion: We concluded that glass fiber posts with parallel fibers (0°), when restoring anterior teeth, present a greater fracture potential by shear stress because parallel fibers are not mechanically resistant to support oblique occlusal loads. Factors such as the presence of remaining coronal tooth structure and occlusal stability assist in the biomechanical equilibrium of stresses that act upon anterior teeth.

Advantages and Drawbacks of Proximal Interphalangeal Joint Fusion Versus Flexor Tendon Transfer in the Correction of Hammer and Claw Toe Deformity. A Finite-Element Study

2010 ◽  
Vol 132 (5) ◽  
Author(s):  
Javier Bayod ◽  
Marta Losa-Iglesias ◽  
Ricardo Becerro de Bengoa-Vallejo ◽  
Juan Carlos Prados-Frutos ◽  
Kevin T. Jules ◽  
...  
Keyword(s):  
Finite Element ◽  
Tendon Transfer ◽  
Proximal Phalanx ◽  
Delayed Union ◽  
Proximal Interphalangeal Joint ◽  
Interphalangeal Joint ◽  
The Finite Element Method ◽  
Flexor Digitorum Brevis ◽  
Flexor Digitorum ◽  
Toe Deformity

Correction of claw or hammer toe deformity can be achieved using various techniques, including proximal interphalangeal joint arthrodesis (PIPJA), flexor digitorum longus tendon transfer (FDLT), and flexor digitorum brevis transfer. PIPJA is the oldest technique, but is associated with significant complications (infection, fracture, delayed union, and nonunion). FDLT eliminates the deformity, but leads to loss of stability during gait. Flexor digitorum brevis tendon transfer (FDBT) seems to be the best surgical alternative, but it is a recent technique with still limited results. In this work, these three techniques have been analyzed by means of the finite-element method and a comparative analysis was done with the aim of extracting advantages and drawbacks. The results show that the best technique for reducing dorsal displacement of the proximal phalanx is PIPJA (2.28 mm versus 2.73 mm for FDLT, and 3.31 mm for FDBT). However, the best technique for reducing stresses on phalanges is FDLT or FDBT (a reduction of approximately 35% regarding the pathologic case versus the increase of 7% for the PIPJA in tensile stresses, and a reduction of approximately 40% versus 25% for the PIPJA in compression stresses). Moreover, the distribution of stresses in the entire phalanx is different for the PIPJA case. These facts could cause problems for patients, in particular, those with pain in the surgical toe.

Residual Stress Induced by Waterjet Peening: A Finite Element Analysis

2004 ◽  
Vol 126 (3) ◽  
pp. 333-340 ◽  
Author(s):  
S. Kunaporn ◽  
M. Ramulu ◽  
M. G. Jenkins ◽  
M. Hashish
Keyword(s):  
Residual Stress ◽  
Finite Element Analysis ◽  
Finite Element ◽  
High Pressure ◽  
Stress Fields ◽  
Process Conditions ◽  
Workpiece Material ◽  
Element Analysis ◽  
Compressive Stresses ◽  
Interfacial Pressure

The concept of multiple droplet impacts resulting from ultra high-pressure waterjet (UHPWJ) was used to develop a mathematical model to describe the effect of interfacial pressure on the underlying workpiece material. A non-linear elastic-plastic finite element analysis (FEA) was carried out in this study using the interfacial pressure model to predict residual compressive stresses. This three-dimensional FEA model was based on quasi-static considerations to provide prediction of both magnitude and depth of residual stress fields in a 7075-T6 aluminum alloy (A17075-T6). Results of the FEA modeling were in good agreement with experimental measurements. Effects of applied pressures on the residual stress fields are also presented and discussed as a method of estimating high-pressure waterjet induced compressive stresses under varying process conditions for peening.

Nonlinear Buckling Finite Element Analysis of Stiffened Steel Plates

2013 ◽  
Vol 699 ◽  
pp. 450-456 ◽  
Author(s):  
E. Gunay ◽  
C. Aygun ◽  
Y. O. Yıldız
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Compressive Loading ◽  
Steel Plates ◽  
Element Analysis ◽  
Nonlinear Buckling ◽  
Compressive Stresses ◽  
Out Of Plane ◽  
Global Buckling ◽  
Stiffened Steel

In this paper, thin rectangular steel plates with stiffeners are examined under compressive loading. Consequently, nonlinear buckling finite element analysis (FEA) solutions are obtained by using ANSYS®. The local and global buckling patterns of stiffened steel plate geometries with simply supported boundary conditions are generated and critical buckling stresses are studied. Geometrically nonlinear buckling analyses are compared in order to evaluate the distributions of compressive stresses versus in-plane contractions and compressive stresses versus out-of plane deflections. Hence, it is concluded that there are critical load intervals. It is also observed that for critical loads, segments between stiffeners may switch from stable to unstable configurations under compressive stresses.

Finite Element Analysis on the Stress and Fracture in the Second Metatarsal

2006 ◽  
Vol 312 ◽  
pp. 275-280
Author(s):  
B. Wang ◽  
Guo Xing Lu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Compressive Stress ◽  
Stress Level ◽  
Stress Fractures ◽  
Direct Impact ◽  
Element Analysis ◽  
High Heel ◽  
Metatarsal Bones ◽  
Second Metatarsal

Footwear has direct impact on the stress level in the metatarsal bones of human feet. In particular, stress fractures at the neck of the second metatarsal are the most common injuries. A finite element analysis was carried out to study the load and stress level in the second metatarsal of a 50-kg female wearing flat and high-heel shoes. It found that the bending of metatarsal due to the flat-footed posture increases the chance of fracture, and the stiletto (high-heeled) posture leads to large compressive stress.

Finite Element Analysis for Stresses in the Craniofacial Sutures Produced by Maxillary Protraction Forces Applied at the Upper Canines

1994 ◽  
Vol 21 (4) ◽  
pp. 343-348 ◽  
Author(s):  
J. Miyasaka-Hiraga ◽  
K. Tanne ◽  
S. Nakamura
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Occlusal Plane ◽  
Element Analysis ◽  
Maxillary Protraction ◽  
Plane Normal ◽  
Compressive Stresses ◽  
Three Dimensional Finite Element

The purpose of this study was to investigate the nature of stress distributions in the craniofacial sutures produced by orthopaedic maxillary protraction forces applied to the upper canines. A three-dimensional finite element model of the craniofacial complex was developed for finite element analysis. An anteriorly directed force of 1·0 kg was applied to the upper canines in three different directions, i.e. parallel, 30 degrees upwards and downwards to the functional occlusal plane. Normal stresses acting on the sutural systems were greatest when force was applied in the 30 degrees upward direction. Furthermore, relatively large compressive stresses were induced in the frontonasal and frontomaxillary sutures, indicating that forward and upward rotation of the nasomaxillary complex was produced with substantial distortion of the complex, by the forces applied in both parallel and 30 degrees upward directions. A 30 degrees downward force produced almost uniform tensile stresses in the zygomaticotemporal and zygomaticomaxillary sutures, with least compressive stresses in the frontonasal and frontomaxillary sutures located in the superior region of the complex. This would indicate a uniform stretch of the nasomaxillary complex in both anterior and inferior directions, With negligible distortion of the complex and would be appropriate for accelerating natural growth of the nasomaxillary complex.

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