Spatial micromovements of uncemented femoral components after torsional loads

A novel method is presented which permits to assess implanted femoral components with regards to location of fixation and initial stability under cyclic torsional loads. The measurement apparatus tracks the spatial movement at several sites of stem and bone, allowing quantitative analysis of the mic...

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Bibliographic Details
Published inJournal of biomechanical engineering Vol. 124; no. 6; p. 706
Main Authors Görtz, W, Nägerl, U V, Nägerl, H, Thomsen, M
Format Journal Article
LanguageEnglish
Published United States 01.12.2002
Subjects
Arthroplasty, Replacement, Hip - methods
Cementation
Equipment Design
Equipment Failure Analysis - instrumentation
Equipment Failure Analysis - methods
Femur - diagnostic imaging
Femur - physiopathology
Femur - surgery
Hip Prosthesis
Humans
Motion
Radiography
Sensitivity and Specificity
Torque
Weight-Bearing
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Summary:A novel method is presented which permits to assess implanted femoral components with regards to location of fixation and initial stability under cyclic torsional loads. The measurement apparatus tracks the spatial movement at several sites of stem and bone, allowing quantitative analysis of the micromotions and twisting of stem and bone, and the location of torque (force) transfer. Four types of prostheses were compared, which revealed striking differences in torque transfer. Our results for synthetic femurs are consistent with in vivo data on the osseointegration and radiolucensies observed for the stem types of this study. The method can be used to quantitatively compare various stem designs and implantation techniques.
ISSN:0148-0731
DOI:10.1115/1.1517565