On optimization of a composite bone plate using the selective stress shielding approach

Samiezadeh, Saeid; Avval, Pouria Tavakkoli; Fawaz, Zouheir

doi:10.1016/j.jmbbm.2014.11.015

Cited by 46 publications

(27 citation statements)

References 40 publications

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“…Mal-union is chiefly manifested due to stiffness mismatch between bone and surgically implanted plate. 9 Indeed, in a bone-plate assembly, although the metallic implant is suitable to provide a mechanically strong and stable condition, but since metals are much stiffer than bone, there is a tendency for metallic plate to sustain a considerable part of the applied load on the bone-plate construct. Hence, the flow of stress in a fixed long bone is deviated from its normal way and it bypasses the fracture site by transmitting through the bridging plate.…”

Section: Introductionmentioning

confidence: 99%

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A mechanobiological approach to find the optimal thickness for the locking compression plate: Finite element investigations

Mohandes

Tahani

Rouhi

et al. 2021

Proc Inst Mech Eng H

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This study aimed at finding the acceptable range, and the optimal value for the locking compression plate (LCP) thickness (THK), through simulating the osteogenic pathway of bone healing, and by checking bone-plate construct’s strength and stability. To attain the goals of this research, a multi-objective approach was adopted, which should trade-off between some conflicting objectives. A finite element model of the long bone-plate construct was made first, and validated against an experimental study. The validated model was then employed to determine the initial strength and stability of the bone-plate construct, for the time right after surgery, for various thicknesses of the LCP. Afterward, coupling with a mechano-regulatory algorithm, the iterative process of bone healing was simulated, and follow up was made for each LCP thickness, over the first 16 post-operative weeks. Results of this study regarding the sequence of tissue evolution inside the fracture gap, showed a similar trend with the existing in-vivo data. For the material and structural properties assigned to the bone-plate construct, in this study, an optimal thickness for the LCP was found to be 4.7 mm, which provides an enduring fixation through secondary healing, whereas for an LCP with a smaller or greater thickness, either bone-implant failure, unstable fixation, impaired fracture consolidation, or primary healing may occur. This result is in agreement with a recent study, that has employed a comprehensive optimization approach to find the optimal thickness.

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Section: Introductionmentioning

confidence: 99%

“…Hence, the flow of stress in a fixed long bone is deviated from its normal way and it bypasses the fracture site by transmitting through the bridging plate. 9 Owing to this reason, progenitor stem cells in callus are deprived of sensing sufficient mechanical signals which are vital for desirable healing in patients. 10…”

Section: Introductionmentioning

confidence: 99%

A mechanobiological approach to find the optimal thickness for the locking compression plate: Finite element investigations

Mohandes

Tahani

Rouhi

et al. 2021

Proc Inst Mech Eng H

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“…The screws were assumed to be bonded to the bone, simulating perfect 92 interdigitation of the cortical bone with the threads of the screws, and the nail and the screws were assumed to have a no-separation contact in which sliding of the contacting surfaces is allowed. A total of seven parameters were employed during this stage to capture the biomechanics of fracture healing as in the author's previous studies [114,135]. They included the: compressive normal force at fracture, average von-Mises stress in the vicinity of the fracture site, fracture opening, shear movement at fracture, and the inverse safety factor (based on Tsai-Hill failure criterion) in the nail.…”

Section: Finite Element Analysismentioning

confidence: 99%

Development of a composite intramedullary nail for treating femoral shaft fractures

Samiezadeh¹

2021

Preprint

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Intramedullary nails are the primary choice for treating long bone fractures. However, the high axial rigidity of conventional nails, can significantly reduce compression at the fracture site, and thereby inhibit bone healing. It can also lead to subsequent bone loss upon fracture healing. Fibrereinforced composites have been suggested as an alternative material of choice in the design of fracture fixation implants to address these drawbacks. There are very few studies in the literature on the use of composite materials for intramedullary nails. In particular, there are no known studies which have considered the optimization of such implants to fulfill the requirements of a proper fracture healing. The purpose of the current thesis is to develop a composite intramedullary nail made of carbon-fibre/epoxy whose structure is optimized to provide a preferred mechanical environment for fracture healing. The thickness and stacking sequence of the composite tube were optimized using closed-form expressions for structural rigidities of a composite tube to minimize axial rigidity of the structure, while minimally sacrificing the bending and torsional rigidities. The actual performance of the best nail candidates inside the human femur was then examined in an experimentally validated finite element model. It was found that a composite nail with an outer diameter of 14 mm and a stacking sequence of [0 / -45 / 45 / -45 / 0 / -45 / 45 / -45 / 45 / -45 / 90 ] showed an overall superiority compared to the other configurations. The expressions for rigidity yielded an axial rigidity of 3.7MN , and bending and torsional rigidities of 70.3 and 70.9 2 N.m , respectively, which correlated well with the results of mechanical testing on the manufactured specimens (i.e. 3.74±0.05 MN, 66.9±1.0 2 N.m , and 70.7±2.0 2 N.m for axial, bending, and torsional rigidities, respectively). The manufactured composite specimens showed high strength in tension (403.9±7.8 MPa), compression (316.9±10.9 MPa), bending (405.3±8.1 MPa), and torsion (328.5±7.3 MPa). Moreover, a fatigue limit of 27 kN was obtained for the composite nail. The stiffness of the composite nail was found to remain almost constant versus the number of cycles. Overall, the findings of this thesis suggest that the proposed intramedullary nail is a potential candidate for use as an alternative to the conventional intramedullary nails.

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“…Therefore, the design of the personalized bone plate needs to alleviate the stress shielding caused by the bone plate at the fracture site [28] . Unlike traditional metal materials such as stainless steel and titanium alloy, composite materials may relieve the stress shielding after implantation due to their similar biomechanical properties to bones [29] [30] . However, orthopedic surgeons prefer metal plates as far as long-term stability after implantation is concerned.…”

Section: Introductionmentioning

confidence: 99%

Feature-Based Design of Personalized Anatomical Plates for the Treatment of Femoral Fractures

2021

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On optimization of a composite bone plate using the selective stress shielding approach

Cited by 46 publications

References 40 publications

A mechanobiological approach to find the optimal thickness for the locking compression plate: Finite element investigations

A mechanobiological approach to find the optimal thickness for the locking compression plate: Finite element investigations

Development of a composite intramedullary nail for treating femoral shaft fractures

Feature-Based Design of Personalized Anatomical Plates for the Treatment of Femoral Fractures

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