scholarly journals Location specific bone strains in dorsal McIII and dorsoproximal P1

2018 ◽  
Vol 50 ◽  
pp. 18-18
Keyword(s):  
Bone Strains

scholarly journals Total ankle replacement design and positioning affect implant-bone micromotion and bone strains

2017 ◽  
Vol 42 ◽  
pp. 80-90 ◽  
Author(s):  
Ran S. Sopher ◽  
Andrew A. Amis ◽  
James D. Calder ◽  
Jonathan R.T. Jeffers
Keyword(s):  
Total Ankle Replacement ◽  
Ankle Replacement ◽  
Bone Strains ◽  
Replacement Design

Effect of Varus/Valgus Malalignment on Bone Strains in the Proximal Tibia After TKR: An Explicit Finite Element Study

2006 ◽  
Vol 129 (1) ◽  
pp. 1-11 ◽  
Author(s):  
A. Perillo-Marcone ◽  
M. Taylor
Keyword(s):  
Finite Element ◽  
Cancellous Bone ◽  
Tibial Component ◽  
Strain Distribution ◽  
Stance Phase ◽  
Gait Cycle ◽  
Proximal Tibia ◽  
Patient Specific ◽  
Bone Strain ◽  
Bone Strains

Malalignment is the main cause of tibial component loosening. Implants that migrate rapidly in the first two post-operative years are likely to present aseptic loosening. It has been suggested that cancellous bone stresses can be correlated with tibial component migration. A recent study has shown that patient-specific finite element (FE) models have the power to predict the short-term behavior of tibial trays. The stresses generated within the implanted tibia are dependent on the kinematics of the joint; however, previous studies have ignored the kinematics and only applied static loads. Using explicit FE, it is possible to simultaneously predict the kinematics and stresses during a gait cycle. The aim of this study was to examine the cancellous bone strains during the stance phase of the gait cycle, for varying degrees of varus/valgus eccentric loading using explicit FE. A patient-specific model of a proximal tibia was created from CT scan images, including heterogeneous bone properties. The proximal tibia was implanted with a commercial total knee replacement (TKR) model. The stance phase of gait was simulated and the applied loads and boundary conditions were based on those used for the Stanmore knee simulator. Eccentric loading was simulated. As well as examining the tibial bone strains (minimum and maximum principal strain), the kinematics of the bone-implant construct are also reported. The maximum anterior–posterior displacements and internal–external rotations were produced by the model with 20mm offset. The peak minimum and maximum principal strain values increased as the load was shifted laterally, reaching a maximum magnitude for −20mm offset. This suggests that when in varus, the load transferred to the bone is shifted medially, and as the bone supporting this load is stiffer, the resulting peak bone strains are lower than when the load is shifted laterally (valgus). For this particular patient, the TKR design analyzed produced the highest cancellous bone strains when in valgus. This study has provided an insight in the variations produced in bone strain distribution when the axial load is applied eccentrically. To the authors’ knowledge, this is the first time that the bone strain distribution of a proximal implanted tibia has been examined, also accounting for the kinematics of the tibio–femoral joint as part of the simulation. This approach gives greater insight into the overall performance of TKR.

scholarly journals Optical metrology analysis of the lower jaw deformations

2011 ◽  
Vol 68 (4) ◽  
pp. 336-340 ◽  
Author(s):  
Ivan Tanasic ◽  
Ljiljana Tihacek-Sojic ◽  
Aleksandra Milic-Lemic
Keyword(s):  
Optical Metrology ◽  
Dental Arch ◽  
Digital Cameras ◽  
Full Field ◽  
Second Molar ◽  
Biomechanical Behavior ◽  
Lower Jaw ◽  
Bone Strains ◽  
Applied Forces ◽  
Lower Premolar

Background/Aim. New optical stereometric methods based on both contact and noncontact mechanisms for displacement measurement have become common methods in biomechanical behavior research of biomaterials, bone and soft tissue. The aim of this study was to register and measure possible deformations of the lower jaw (mandible) with the intact dental arch using optical metrology method. Methods. The system for full field measurement of deformations (strains) comprised of two digital cameras for a synchronized stereoview of the specimen, and the Aramis software. Results. The maximum mandibular bone strains were measured in the regions of the lower first premolar and the lower second molar. In the action force of 500 N simulated in the region of the first lower premolar the intensity of deformation was 86 ?m. The value of maximum strain in the bone around the molars was 24 ?m for the force of 500 N acting on the second lower molar. When it comes to premolars, 3-5 times stronger deformation was observed in the region of the first lower premolar, compared to the deformation values of the second lower premolar area. Conclusion. Under loading of the applied forces the measured strains were in the elastic deformation area, meanning that the dependence of force and deformity is linear. The highest values of strain measurements obtained by the optical method were found in the jaw bone tissue around the loading teeth, and the bony regions of the triangle and mental region. According to the obtained results from the Aramis processing software it can be concluded that this method is applicable in a variety of biomedical research.

Variations in habitual bone strains in vivo: Long bone versus mandible

2010 ◽  
Vol 172 (3) ◽  
pp. 311-318 ◽  
Author(s):  
W.C. de Jong ◽  
J.A.M. Korfage ◽  
G.E.J. Langenbach
Keyword(s):  
Long Bone ◽  
Bone Strains

Technical note: Development of a model for study ofin vivo bone strains in normal and microgravity environments

1995 ◽  
Vol 6 (3) ◽  
pp. 203-208 ◽  
Author(s):  
John A. Szivek ◽  
Philip L. Anderson ◽  
Deborah L. Wilson ◽  
Donald W. De Young
Keyword(s):  
Technical Note ◽  
Bone Strains

The Effect of Distal Ulnar Implant Stem Material and Length on Bone Strains

2007 ◽  
Vol 32 (6) ◽  
pp. 848-854 ◽  
Author(s):  
Rebecca L. Austman ◽  
Brendon J.B. Beaton ◽  
Cheryl E. Quenneville ◽  
Graham J.W. King ◽  
Karen D. Gordon ◽  
...  
Keyword(s):  
Bone Strains

Femoral bone strains during antegrade nailing: A comparison of two entry points with identical nails using finite element analysis

2012 ◽  
Vol 27 (4) ◽  
pp. 354-359 ◽  
Author(s):  
Todd M. Tupis ◽  
Gregory T. Altman ◽  
Daniel T. Altman ◽  
Harold A. Cook ◽  
Mark Carl Miller
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Femoral Bone ◽  
Element Analysis ◽  
Antegrade Nailing ◽  
Entry Points ◽  
Bone Strains

scholarly journals Total arthroplasty of basal thumb joint with Elektra prothesis: an in vitro analysis

2016 ◽  
Vol 41 (9) ◽  
pp. 930-938
Author(s):  
A. Completo ◽  
A. Nascimento ◽  
F. Neto
Keyword(s):  
Cancellous Bone ◽  
Computational Models ◽  
Insertion Technique ◽  
Level Of Evidence ◽  
Total Arthroplasty ◽  
Strain Behaviour ◽  
Bone Strains ◽  
Joint Load ◽  
Vitro Analysis

The reported outcomes of the Elektra thumb carpo-metacarpal joint implant have been very variable. This study evaluates the influence of daily cyclic loads and the type of the screw-fit cup insertion technique in the trapezium, with and without prior threading, on the structural bone behaviour. The study was performed experimentally to predict initial implant stability and cortical bone strains. Computational models were developed to assess the structural cancellous bone behaviour. The use of Elektra implant considerably changed the bone strain behaviour compared with the intact joint. This may be associated with risks of cancellous bone fatigue failure due to overload, particularly in the trapezium. The joint load magnitude has a more important structural role than that of the screw-fit cup insertion technique. Limiting the magnitude of thumb loads after arthroplasty may contribute positively to the longevity of this procedure. Level of evidence: V

Predisposing Factors for Orthodontic Mini-Implant Failure Defined by Bone Strains in Patient-Specific Finite Element Models

2016 ◽  
Vol 44 (10) ◽  
pp. 2948-2956 ◽  
Author(s):  
Mhd Hassan Albogha ◽  
Toru Kitahara ◽  
Mitsugu Todo ◽  
Hiroto Hyakutake ◽  
Ichiro Takahashi
Keyword(s):  
Finite Element ◽  
Predisposing Factors ◽  
Implant Failure ◽  
Patient Specific ◽  
Finite Element Models ◽  
Bone Strains
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