title: Comparison of mechanical stress and change in bone mineral density between two types of femoral implant using finite element analysis.
abstract: Stress shielding after total hip arthroplasty (THA) remains an unsolved issue. Various patterns of mechanical stress appear according to the type of femoral stem used. To compare differences in mechanical stress conditions between Zweymuller type and fit-and-fill type stems, finite element analysis (FEA) was performed. Differences in bone mineral density (BMD) changes in the femur were also compared. Maximum stress was confirmed in Gruen zone 4, whereas zone 1 had the minimum amount of stress with both types of implant. The Zweymuller stem group had less mechanical stress and lower BMD in zone 7 than the fit-and-fill stem group. In conclusion, differences in mechanical stress may be related to changes in BMD after THA.
authors.affiliation: Department of Orthopedic Surgery, Yokohama City University, Yokohama, Japan.
authors.forename: Yasuhide
authors.initials: Y
authors.lastname: Hirata
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Inaba
authors.forename: Naomi
authors.initials: N
authors.lastname: Kobayashi
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Ike
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Fujimaki
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Saito
mesh_terms: D015502:Absorptiometry, Photon; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects*; D015519:Bone Density; D001862:Bone Resorption / Q000000981:diagnostic imaging / Q000209:etiology* / Q000503:physiopathology; D005260:Female; D005269:Femur / Q000000981:diagnostic imaging / Q000503:physiopathology* / Q000601:surgery; D020342:Finite Element Analysis; D006622:Hip Prosthesis / Q000009:adverse effects*; D006801:Humans; D008875:Middle Aged; D011474:Prosthesis Design; D013314:Stress, Mechanical; D014057:Tomography, X-Ray Computed
keywords: bone mineral density (BMD); femoral implant; finite element analysis (FEA); stress shielding; total hip arthroplasty (THA)