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Nonlinear Three‐Dimensional Finite Element Analysis of Newly Designed Cementless Total Hip Stems
Author(s) -
Ando Masao,
Imura Shinichi,
Omori Hironori,
Okumura Yasuhiro,
Bo Akihiko,
Baba Hisatoshi
Publication year - 1999
Publication title -
artificial organs
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.684
H-Index - 76
eISSN - 1525-1594
pISSN - 0160-564X
DOI - 10.1046/j.1525-1594.1999.06214.x
Subject(s) - femur , finite element method , reduction (mathematics) , anatomy , medicine , orthodontics , biomedical engineering , mathematics , surgery , structural engineering , geometry , engineering
We designed 2 new types of proximally coated stems (the FMS and FMS‐anatomic) based on the endosteal geometry of femora with congenital dislocation or dysplastic hip. The FMS was symmetric while the FMS‐anatomic was asymmetric. We compared the proximal fit and fill to the femoral canal, contact stress, relative motion, and load transfer to the femur of 5 stems (FMS, FMS‐anatomic, Omnifit, Omniflex, and individual stem) using three‐dimensional computer simulation and finite element analysis. The FMS and FMS‐anatomic showed a significantly greater fit and fill than conventional stems. The dispersion of the contact stresses and reduction of relative motions in the proximal area were the best in the FMS‐anatomic compared to other stems with the exception of the individual stem. In addition, the FMS‐anatomic stem transferred most of the load to the proximal femur. Our results suggest that the FMS‐anatomic should provide better biomechanical stability at least in the early postoperative period.