Design process of cementless femoral stem using a nonlinear three dimensional finite element analysis

Baharuddin, Mohd Yusof; Salleh, Sheikh Hussain Shaikh; Zulkifly, Ahmad Hafiz; Lee, Muhammad Hisyam; Noor, Alias Mohd; Harris, Arief R.; Majid, Norazman Abdul; Kader, Ab. Saman Abd.

doi:10.1186/1471-2474-15-30

Cited by 24 publications

(11 citation statements)

References 53 publications

(134 reference statements)

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“…The clear distal load transfer after the implantation of both short stems demonstrated in this study is congruent with previous studies, which have found a similar distally shifting load distribution pattern as a result of implant insertion [ 24 , 61 , 62 ]. Despite the fact that short-stem femoral implants have displayed a better biomechanical behavior preserving a strain distribution closer to the intact bone according to previous studies [ 24 , 28 , 42 , 43 , 63 – 65 ], the implantation of a stiffer material absorbs the load and transfers it distally, leaving the proximal region of the calcar somewhat stress-shielded.…”

Section: Discussionsupporting

confidence: 92%

Comparative analysis of the biomechanical behavior of two different design metaphyseal-fitting short stems using digital image correlation

et al. 2020

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Background: The progressive evolution in hip replacement research is directed to follow the principles of bone and soft tissue sparing surgery. Regarding hip implants, a renewed interest has been raised towards short uncemented femoral implants. A heterogeneous group of short stems have been designed with the aim to approximate initial, post-implantation bone strain to the preoperative levels in order to minimize the effects of stress shielding. This study aims to investigate the biomechanical properties of two distinctly designed femoral implants, the TRI-LOCK Bone Preservation Stem, a shortened conventional stem and the Minima S Femoral Stem, an even shorter and anatomically shaped stem, based on experiments and numerical simulations. Furthermore, finite element models of implant-bone constructs should be evaluated for their validity against mechanical tests wherever it is possible. In this work, the validation was performed via a direct comparison of the FE calculated strain fields with their experimental equivalents obtained using the digital image correlation technique. Results: Design differences between Trilock BPS and Minima S femoral stems conditioned different strain pattern distributions. A distally shifting load distribution pattern as a result of implant insertion and also an obvious decrease of strain in the medial proximal aspect of the femur was noted for both stems. Strain changes induced after the implantation of the Trilock BPS stem at the lateral surface were greater compared to the non-implanted femur response, as opposed to those exhibited by the Minima S stem. Linear correlation analyses revealed a reasonable agreement between the numerical and experimental data in the majority of cases. Conclusion: The study findings support the use of DIC technique as a preclinical evaluation tool of the biomechanical behavior induced by different implants and also identify its potential for experimental FE model validation. Furthermore, a proximal stress-shielding effect was noted after the implantation of both short-stem designs. Design-specific variations in short stems were sufficient to produce dissimilar biomechanical behaviors, although their clinical implication must be investigated through comparative clinical studies.

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Section: Discussionsupporting

confidence: 92%

Comparative analysis of the biomechanical behavior of two different design metaphyseal-fitting short stems using digital image correlation

et al. 2020

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“…The clear distal load transfer after the implantation of both short stems demonstrated in this study is congruent with previous studies, which have found a similar distally shifting load distribution pattern as a result of implant insertion (24,61,62). Despite the fact that short stem femoral implants have displayed a better biomechanical behavior preserving a stain distribution closer to the intact bone according to previous studies (24,28,42,43,(63)(64)(65), the implantation of a stiffer material absorbs the load and transfers it distally, leaving the proximal region of the calcar somewhat stress-shielded.…”

Section: Discussionsupporting

confidence: 92%

Comparative Analysis of the Biomechanical Behavior of two different design metaphyseal-fitting short stems using digital image correlation

Tatani

Megas

Παναγόπουλος

et al. 2020

Preprint

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Background: The progressive evolution in hip replacement research is directed to follow the principles of bone and soft tissue sparing surgery. Regarding hip implants, a renewed interest has been raised towards short uncemented femoral implants. A heterogeneous group of short stems have been designed with the aim to approximate initial, post-implantation bone strain to the preoperative levels in order to minimize the effects of stress shielding. This study aims to investigate the biomechanical properties of two distinctly designed femoral implants, the TRI-LOCK Bone Preservation Stem, a shortened conventional stem and the Minima S Femoral Stem, an even shorter and anatomically shaped stem, based on experiments and numerical simulations. Furthermore, finite element models of implant–bone constructs should be evaluated for their validity against mechanical tests wherever it is possible. In this work, the validation was performed via a direct comparison of the FE calculated strain fields with their experimental equivalents obtained using the digital image correlation technique. Results: Design differences between Trilock BPS and Minima S femoral stems conditioned different strain pattern distributions. A distally shifting load distribution pattern as a result of implant insertion and also an obvious decrease of strain in the medial proximal aspect of the femur was noted for both stems. Strain changes induced after the implantation of the Trilock BPS stem at the lateral surface were greater compared to the non-implanted femur response, as opposed to those exhibited by the Minima S stem. Linear correlation analyses revealed a reasonable agreement between the numerical and experimental data in the majority of cases. Conclusion: The study findings support the use of DIC technique as a preclinical evaluation tool of the biomechanical behavior induced by different implants and also identify its potential for experimental FE model validation. Furthermore, a proximal stress shielding effect was noted after the implantation of both short stem designs. Design specific variations in short stems were sufficient to produce dissimilar biomechanical behaviors, although their clinical implication must be investigated through comparative clinical studies.

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“…However, there is no universal off shelves hip implant that suits all populations [3][4][5]. The peculiar hip morphology for the ASEAN population, especially at the neck-shaft angle, femoral head offset, isthmus location, and mediolateral region promote the development of an appropriate implant's design that complies ASEAN hip anthropometric [6][7].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Low-Cost Hip Implant using Direct Metal Laser Sintering Technique

Baharuddin¹,

Zulkifly²,

Choo³

et al. 2019

IJRTE

Self Cite

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Total hip replacement (THR) is the most popular surgery been performed in orthopedic surgery due to the inclination of musculoskeletal disorder and the aging population worldwide. However, the implant’s cost-burdened the patient, especially in the ASEAN region. The main objective of this study was to fabricate the low-cost hip implant using direct laser metal sintering (DMLS). The framework starts with the three dimensional of hip anthropometric datasets from computed tomography scanner, followed with the design of hip implant, computational analysis using finite element, and finally fabrication using DMLS technique. The morphological results demonstrated the value of neck-shaft angle was 130.46º, and the femoral head offset of 30.35 mm. The finite element analysis showed strain distribution was 65 MPa for the implant in metaphyseal region and 110 MPa for intact femur under staircase physiological loading which indicated inhibition of stress shielding at medical calcar region, and micromotion was 4.8 µm which prevent the formation of fibrous tissue and promoting osseointegration between implant-bone interfaces. This study proposed the fabrication using the DMLS technique, which produced accurate implant with low-cost, which suits the ASEAN hip morphology that prolongs implant lifetime.

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Design process of cementless femoral stem using a nonlinear three dimensional finite element analysis

Cited by 24 publications

References 53 publications

Comparative analysis of the biomechanical behavior of two different design metaphyseal-fitting short stems using digital image correlation

Comparative analysis of the biomechanical behavior of two different design metaphyseal-fitting short stems using digital image correlation

Comparative Analysis of the Biomechanical Behavior of two different design metaphyseal-fitting short stems using digital image correlation

Fabrication of Low-Cost Hip Implant using Direct Metal Laser Sintering Technique

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