Pre-operative planning and gait analysis of total hip replacement following hip fusion

M. G. Benedetti, E. Montanari, F. Catani, G. Vicenzi, A. Leardini

Research output: Contribution to journalArticlepeer-review


A computer-based pre- and post-operative analysis of total hip replacement (THR) is presented. The analysis was performed by using and innovative combination of X-ray measurements and gait analysis. The several important biomechanical factors that affect effective THR are analysed in a test clinical case of conversion of hip fusion into THR. Geometrical positioning of the artificial joint should restore correct motion and adequate leverage of the surrounding muscles in order to exert the appropriate functional joint moments. Hip joint centre positioning pre- and post-operation was evaluated using a computer-based X-ray measurement tool. This enabled the calculation of the medio-lateral and proximal-distal off-set of the joint centre, the lever arms of the abductor muscles and the limb length discrepancy. Pre- and post-operative function was also evaluated using gait analysis, including joint kinematics, kinetics and electromyography. The whole analysis suggests that a good restoration of joint motion, a regression of pelvic compensation and a phasic activity of gluteus medius occur only when a good positioning of the prosthetic hip joint is obtained. This study proved a fundamental role played by these two computer-based tools in the support of the clinical decision making process.

Original languageEnglish
Pages (from-to)215-221
Number of pages7
JournalComputer Methods and Programs in Biomedicine
Issue number3
Publication statusPublished - Mar 2003


  • Computer-based preoperative planning
  • Gait analysis
  • Hip fusion
  • Hip replacement
  • Joint function
  • X-ray measurement

ASJC Scopus subject areas

  • Software


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