Dynamic in-vivo tibio-femoral and bearing motions in mobile bearing knee arthroplasty

S. Fantozzi, A. Leardini, S. A. Banks, M. Marcacci, S. Giannini, F. Catani

Research output: Contribution to journalArticlepeer-review


To determine the tibio-femoral and bearing motions in well functioning mobile bearing total knee arthroplasties, a quantitative analysis by means of fluoroscopy was carried out during stair ascending, chair rising-sitting and step up-down motor tasks. Femoral and tibial component positions were obtained using a CAD-model-based shape matching technique. Direct measurement of mobile bearing motion was carried out by tracking previously inserted tantalum beads. A relatively small motion of the bearing was observed. The advantage of self-alignment claimed for the mobile bearing arthroplasty seems to be confirmed by subject-specific ranges of motion exhibited by these patients. It has also been demonstrated that these total knee arthroplasties, which are not fully conforming in flexion, provide little constraint to antero-posterior motion, leading to a kinematic pattern very similar to an ACL deficient knee.

Original languageEnglish
Pages (from-to)144-151
Number of pages8
JournalKnee Surgery, Sports Traumatology, Arthroscopy
Issue number2
Publication statusPublished - Mar 2004


  • Activities of daily living
  • Fluoroscopy
  • Mobile bearing tracking
  • Prosthesis component kinematics
  • Total knee arthroplasty

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation
  • Surgery


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