%0 Journal Article
%T Patient
%A Hassan El-Hofy
%A Osama Abdelaal
%A Saied Darwish
%A Yoshio Saito
%J The International Journal of Artificial Organs
%@ 1724-6040
%D 2019
%R 10.1177/0391398818815479
%X There are several commercially available hip implant systems. However, for some cases, custom implant designed based on patient-specific anatomy can offer the patient the best available implant solution. Currently, there is a growing trend toward personalization of medical implants involving additive manufacturing into orthopedic medical implantsĄ¯ manufacturing. This article introduces a systematic design methodology of femoral stem prosthesis based on patientĄ¯s computer tomography data. Finite element analysis is used to evaluate and compare the micromotion and stress distribution of the customized femoral component and a conventional stem. The proposed customized femoral stem achieved close geometrical fit and fill between femoral canal and stem surfaces. The customized stem demonstrated lower micromotion (peak: 21 ĻĖm) than conventional stem (peak: 34 ĻĖm). Stress results indicate up to 89% increase in load transfer by conventional stem than custom stem because the higher stiffness of patient-specific femoral stem proximally increases the custom stem shielding in GruenĄ¯s zone 7. Moreover, patient-specific femoral stem transfers the load widely in metaphyseal region. The customized femoral stem presented satisfactory results related to primary stability, but compromising proximo-medial load transfer due to increased stem cross-sectional area increased stem stiffness
%K Femoral stem
%K patient-specific
%K subject-specific finite element analysis
%K fit and fill
%K additive manufacturing
%U https://journals.sagepub.com/doi/full/10.1177/0391398818815479