Femur Bone Implant Plate Design Analysis Under Varying Fracture Conditions

2021 ◽  
pp. 403-421
Author(s):  
Nilesh Tipan ◽  
Ajay Pandey ◽  
Girish Chandra
Keyword(s):  
Design Analysis ◽  
Bone Implant ◽  
Femur Bone ◽  
Plate Design

scholarly journals Prediction of stress shielding around implant screws induced by three-point and four-point bending

2019 ◽  
Vol 15 (4) ◽  
pp. 548-554
Author(s):  
Izzawati Basirom ◽  
Mohd Afendi Rojan ◽  
Mohd Shukry Abdul Majid ◽  
Nor Alia Md Zain ◽  
Mohd Yazid Bajuri
Keyword(s):  
Strain Energy ◽  
Stress Shielding ◽  
Lateral Impact ◽  
Bone Implant ◽  
Femur Bone ◽  
Four Point Bending ◽  
Biomechanical Compatibility ◽  
Bending Load ◽  
Fracture Area ◽  
Bending Behavior

Implant screws failure commonly occurs due to the load that constantly generated by the patient’s body to the fracture area. Bending load is often encountered in femur bone due to lateral impact which affected the bone and also the implants installed. Consequently, the load will lead to the failure of implants that can cause loosening or tightening of implants. Henceforth, in this manner, it is significant to study the bending behavior of bone implant in femur bone. The aim of this study was to analyze the stress shielding of bone implant on the internal fixator. 3D technique is able to show the overall deformation and stress distribution. The lower the biomechanical compatibility, the lower the STP value obtained. In addition, the variation of elastic modulus (E) of the screws materials, 200GPa (Stainless Steel) and 113.8GPa (Titanium) resulted in the increase of the total stress transferred (STP) between screw and bone interface. In this work, strain energy density (SED) was determined as a good indicator of stress shielding.

Lectinhistochemistry Evaluation of Bone after Implantation with Macroporous Titanium Samples

2012 ◽  
Vol 77 ◽  
pp. 190-195 ◽  
Author(s):  
Kalan Bastos Violin ◽  
Tamiye Simone Goia ◽  
José Carlos Bressiani ◽  
Ana Helena de Almeida Bressiani
Keyword(s):  
Healing Process ◽  
High Vacuum ◽  
High Specificity ◽  
Membrane Glycoproteins ◽  
Bone Implant ◽  
Femur Bone ◽  
Shape Processing ◽  
Near Net Shape ◽  
13Zr Alloy ◽  
Molecular Evaluation

Titanium and its alloys are widely used as biomaterials and interact well with bone tissue. In order, to evaluate more than just morphological osseointegration by histological slides the work aimed to approach a molecular evaluation of bone-implant using lectinhistochemistry (LHC), which binds with high specificity carbohydrates (sugar residues) presents in membrane glycoproteins with the use of lectins. The implanted samples were obtained by powder metallurgy, Ti-13Nb-13Zr alloy with and without gelatin. Pores were achieved by adding gellatin 5 wt% to the hydrogenated metallic powder, after near net shape processing, the samples were thermal treated in vacuum (300 °C/90min) and sintered in high-vacuum (1150 °C/14h). The samples were characterized for porosity (~30%), and subsequently were implanted in rat’s femur bone. After 4 weeks of healing process, bone with implant were sampled to perform LHC in paraffin embedded tissue in histological slides using the lectins PNA, UEA-1, WGA, sWGA and RCA-1. All samples osseointegrated well with the bone, no fibrous capsule was present in the bone which was in contact with the implant. With the molecular approach of osseointegration, adjustments in the processing and structure of macroporous titanium based implants can be performed to achieve friendly structure.

scholarly journals Acceleration of Bone Fracture Healing through the Use of Natural Bovine Hydroxyapatite Implant on Bone Defect Animal Model

2019 ◽  
Vol 55 (3) ◽  
pp. 176
Author(s):  
Junaidi Khotib ◽  
Cantika SC Lasandara ◽  
Samirah Samirah ◽  
Aniek S Budiatin
Keyword(s):  
Fracture Healing ◽  
Bone Defect ◽  
Bone Fracture ◽  
Control Group ◽  
Bone Fracture Healing ◽  
Bone Implant ◽  
Femur Bone ◽  
Significant Difference ◽  
Bovine Hydroxyapatite ◽  
Rabbit Femur

Bone is an important organ for supports the body that stores reserve of calcium, phosphorus, and other minerals. In fracture conditions where bleeding, soft tissue edema, nerve damage, and blood vessels around the bone damage happen, they can cause the mobilization of these minerals in the surrounding tissue. One of the efforts made in the treatment of these fractures is reconnection, in which it works by filling of bone defect with a matrix and administration of anti-infection. Biomaterial filling in defective bone is thought to accelerate the healing process of bone fracture and prevent osteomyelitis. For this reason, this study evaluates the acceleration of bone fracture healing using natural hydroxyapatite (NHA) bone filler in rabbits with bone defect model. Fracture modeling was performed by surgical technique and drilling of bones with a 4.2 mm diameter to form a defect in the rabbit femur. Bone implant contained bovine hydroxyapatite-gelatin-glutaraldehyde (BHA implant) or bovine hydroxyapatite-gelatin-glutaraldehyde-gentamicin (BHA-GEN implant) that was inserted in bone defects. 27 rabbits were divided into 3 groups: the control group who had bone defect, the bone defect group was given BHA implant and the bone defect group was given BHA-GEN implant. Observation of osteoclast, osteoblast, osteocyte, BALP level, and bone morphological integrity was carried out on the 14th, 28th, and 42nd days after surgery. Histological observation of rabbit femur showed a significant difference on the number of osteoclast, osteoblast and osteocyte in all three groups. The BALP level also showed a significant difference in the group given the natural BHA bone implant compared to the control group on day 14 (p = 0.0361). Based on the result of the X-ray, there was also a better integration of rabbit femur bone in groups with the use of BHA or BHA-GEN bone implant. Thus, it can be concluded that the use of a natural BHA implant can accelerate the process of bone repair in the fracture of rabbit femur. In addition, BHA implants were compatible as a matrix for supporting the bone cell growth.

scholarly journals Modal Analysis of Femur Bone to Find out the Modal Frequencies of Different Bone Implant Materials

2020 ◽  
Vol 8 (4S) ◽  
pp. 65-69
Keyword(s):  
Modal Analysis ◽  
Daily Activity ◽  
Bone Implants ◽  
Femur Head ◽  
Stainless Steel 316L ◽  
Bone Implant ◽  
Natural Bone ◽  
Human Femur ◽  
Femur Bone ◽  
Modeling Analysis

Bio-mechanics is most difficult to carry out on the bone due to the modeling difficulty and complex forces acting on the bones. In this study, we consider human femur bone for modeling analysis. The modal analysis is also important as that of static analysis. We can predict the place at which the fracture occurs. The modal analysis for three different materials is carried out to find the feasible material for bone implants. These materials are Natural bone, AZ31, and Stainless steel 316L. The daily activity such as walking is used as a boundary condition in our study. The femur head is fixed and 750N load is applied at the Knee joint. The results are obtained for these materials. The modal frequencies for Natural Femur bone vary from 0.328Hz to 2.258Hz for Mode1 to Mode 10. The modal frequencies for AZ31 vary from 1.502Hz to 10.292 Hz for Mode1 to Mode 10. The modal frequencies for 316L vary from 3.120Hz to 21.150 Hz for Mode1 to Mode 10. These frequencies are minimal as compared to the natural frequency of the Femur bone. AZ31 is best suited for the fabrication of bone implants because of its lightweight in comparison with 316L material. Also, this is biodegradable in the human body over the period.

Factors influencing adhesive bonding at the bone/implant interface

1992 ◽  
Vol 50 (2) ◽  
pp. 1114-1115
Author(s):  
Julie A. Martini ◽  
Robert H. Doremus
Keyword(s):  
Electron Microscopy ◽  
Adhesive Bonding ◽  
Microscopy Study ◽  
Electron Microscopy Study ◽  
Bone Implant ◽  
Factors Influencing ◽  
Lr White ◽  
Transmission Electron ◽  
New Zealand White Rabbits ◽  
Scanning Electron

Tracy and Doremus have demonstrated chemical bonding between bone and hydroxylapatite with transmission electron microscopy. Now researchers ponder how to improve upon this bond in turn improving the life expectancy and biocompatibility of implantable orthopedic devices.This report focuses on a study of the- chemical influences on the interfacial integrity and strength. Pure hydroxylapatite (HAP), magnesium doped HAP, strontium doped HAP, bioglass and medical grade titanium cylinders were implanted into the tibial cortices of New Zealand white rabbits. After 12 weeks, the implants were retrieved for a scanning electron microscopy study coupled with energy dispersive spectroscopy.Following sacrifice and careful retrieval, the samples were dehydrated through a graduated series starting with 50% ethanol and continuing through 60, 70, 80, 90, 95, and 100% ethanol over a period of two days. The samples were embedded in LR White. Again a graduated series was used with solutions of 50, 75 and 100% LR White diluted in ethanol.

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