Three Dimensional Morphometry of the Femur to Design the Total Hip Arthroplasty for Malay Population

Baharuddin, Mohd Yusof; Zulkifly, Ahmad Hafiz; Lee, Muhammad Hisyam; Kadir, Mohammed Rafiq Abdul; Saat, Azlin; Aziz, Azian Abd.

doi:10.1166/asl.2013.5085

Cited by 10 publications

(19 citation statements)

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“…Noble et al [ 3 ] classified the endosteal canal into three different shapes based on the canal flare index (CFI): stovepipe shape (CFI < 3.0), normal shape (3.0 < CFI < 4.7) and champagne flute shape (CFI > 4.7). In our previous study [ 6 - 9 ], we found that Asian medullary canals are categorized under normal and champagne flute shape. This peculiar proximal hip morphology of Asian’s requires the development of an appropriate design which could prevent complications due to the implant’s geometric mismatch such as stress shielding, micromotion and loosening [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

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

Baharuddin

Salleh

Zulkifly

et al. 2014

BMC Musculoskelet Disord

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BackgroundMinimal available information concerning hip morphology is the motivation for several researchers to study the difference between Asian and Western populations. Current use of a universal hip stem of variable size is not the best option for all femur types. This present study proposed a new design process of the cementless femoral stem using a three dimensional model which provided more information and accurate analysis compared to conventional methods.MethodsThis complete design cycle began with morphological analysis, followed by femoral stem design, fit and fill analysis, and nonlinear finite element analysis (FEA). Various femur parameters for periosteal and endosteal canal diameters are measured from the osteotomy level to 150 mm below to determine the isthmus position.ResultsThe results showed better total fit (53.7%) and fill (76.7%) canal, with more load distributed proximally to prevent stress shielding at calcar region. The stem demonstrated lower displacement and micromotion (less than 40 μm) promoting osseointegration between the stem–bone and providing primary fixation stability.ConclusionThis new design process could be used as a preclinical assessment tool and will shorten the design cycle by identifying the major steps which must be taken while designing the femoral stem.

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Section: Introductionmentioning

confidence: 99%

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

Baharuddin

Salleh

Zulkifly

et al. 2014

BMC Musculoskelet Disord

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“…We prospectively acquired the computed tomography (CT) images from 60 healthy hips prior to designing the cementless femoral stem in accordance with the peculiar morphology of the Asian population (13)(14)(15)(16). The design process used a three-dimensional femora model that provides more anthropometric information and accurate measurement.…”

Section: Methodsmentioning

confidence: 99%

“…The cementless femoral stem was designed to optimally fit and fill the endosteal canal as shown in Fig. The 3D femora model chosen for finite element study was the "average" femora from the previous study (13)(14)(15)(16). Interquartile range descriptive analysis was used as the stem design profile, and nonlinear finite element analysis was conducted to predict the outcome of the early stage after the surgery according to the standard protocol of virtual implantation (2)(3)(4).…”

Section: Methodsmentioning

confidence: 99%

“…The finite element model for the cementless femoral stem consisted of 4226 nodes and 13 241 elements, whereas the "virtual surgery femora" consisted of 7946 nodes and 41 900 elements. The 3D femora model chosen for finite element study was the "average" femora from the previous study (13)(14)(15)(16). The material properties of the cementless femoral stem were assigned as 316L stainless steel with a Young's Modulus of 200 GPa and a Poisson's ratio of 0.3 (2).…”

Section: Methodsmentioning

confidence: 99%

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Fabrication of Low‐Cost, Cementless Femoral Stem 316L Stainless Steel Using Investment Casting Technique

et al. 2014

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Total hip arthroplasty is a flourishing orthopedic surgery, generating billions of dollars of revenue. The cost associated with the fabrication of implants has been increasing year by year, and this phenomenon has burdened the patient with extra charges. Consequently, this study will focus on designing an accurate implant via implementing the reverse engineering of three-dimensional morphological study based on a particular population. By using finite element analysis, this study will assist to predict the outcome and could become a useful tool for preclinical testing of newly designed implants. A prototype is then fabricated using 316L stainless steel by applying investment casting techniques that reduce manufacturing cost without jeopardizing implant quality. The finite element analysis showed that the maximum von Mises stress was 66.88MPa proximally with a safety factor of 2.39 against endosteal fracture, and micromotion was 4.73μm, which promotes osseointegration. This method offers a fabrication process of cementless femoral stems with lower cost, subsequently helping patients, particularly those from nondeveloped countries.

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“…This trend inclination leads the implant's manufacturer to produce better designs that cater to all populations. 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

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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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Three Dimensional Morphometry of the Femur to Design the Total Hip Arthroplasty for Malay Population

Cited by 10 publications

References 0 publications

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

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

Fabrication of Low‐Cost, Cementless Femoral Stem 316L Stainless Steel Using Investment Casting Technique

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

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