Design process of cementless femoral stem using a nonlinear three dimensional finite element analysisReportar como inadecuado

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BMC Musculoskeletal Disorders

, 15:30

Orthopedics and biomechanics


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.

KeywordsMorphology Femur Hip replacement Cementless hip Finite element analysis Electronic supplementary materialThe online version of this article doi:10.1186-1471-2474-15-30 contains supplementary material, which is available to authorized users.

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Autor: Mohd Yusof Baharuddin - Sh-Hussain Salleh - Ahmad Hafiz Zulkifly - Muhammad Hisyam Lee - Alias Mohd Noor - Arief Ruhulla


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