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

BMC Musculoskeletal Disorders

Ab Saman Abd Kader³  Norazman Abdul Majid¹  Arief Ruhullah A Harris¹  Alias Mohd Noor¹  Muhammad Hisyam Lee²  Ahmad Hafiz Zulkifly⁴  Sh-Hussain Salleh¹  Mohd Yusof Baharuddin¹ 

[1] Centre for Biomedical Engineering Transportation Research Alliance, Universiti Teknologi Malaysia, Skudai, Johor, Malaysia;Department of Mathematical Sciences, Faculty of Science, Universiti Teknologi Malaysia, Skudai, Johor, Malaysia;Transportation Research Alliance, Universiti Teknologi Malaysia, Skudai, Johor, Malaysia;Department of Orthopaedic, Traumatology & Rehabilitation, Kuliyyah of Medicine, International Islamic University Malaysia, Kuantan, Pahang, Malaysia

关键词: Finite element analysis;    Cementless hip;    Hip replacement;    Femur;    Morphology;   

Others  :  1128869
DOI  :  10.1186/1471-2474-15-30

 received in 2013-09-07, accepted in 2014-01-29,  发布年份 2014

【 摘 要 】

Background

Minimal 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.

Methods

This 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.

Results

The 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.

Conclusion

This 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.

【 授权许可】

   
2014 Baharuddin et al.; licensee BioMed Central Ltd.

【 图 表 】

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