Spatial micromovements of uncemented femoral components after torsional loads

J Biomech Eng. 2002 Dec;124(6):706-13. doi: 10.1115/1.1517565.


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.

Publication types

  • Comparative Study

MeSH terms

  • 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*