A mechanical comparison of high-flexion and conventional total knee arthroplasty

M. Barink, M. De Waal Malefijt, P. Celada, P. Vena, A. Van Kampen, N. Verdonschot

Research output: Contribution to journalArticlepeer-review

Abstract

The question addressed in this study was whether high-flexion total knee arthroplasty (TKA) designs improve the mechanical behaviour of TKAs in high flexion and whether they maintain the mechanical performance of conventional TKAs at normal flexion angles.

A finite element study was performed in which the mechanical behaviour of the conventional Sigma RP and the new high-flexion Sigma RP-F were compared, during a dynamic simulation of a high-flexion squatting activity. Forces, stresses, and contact positions were calculated during different stages of the simulations.

In general, higher stresses were found with larger flexion angles for both designs. Mechanical parameters were similar in normal flexion. In high flexion, lower stress and deformation values were found for the high-flexion Sigma RP-F, except for the contact stress at the post of the insert.

This study confirms that a high-flexion design can improve mechanical behaviour at high-flexion without changing the performance in normal flexion. Hence, although a high-flexion TKA may show a similar or better performance in comparison with a conventional TKA, high-flexion activities still cause an increase in the implant stress levels. Therefore, the patient's demand for large flexion angles may reduce the longevity of TKA implants.

Original languageEnglish
Pages (from-to)297-307
Number of pages11
JournalProceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine
Volume222
Issue number3
DOIs
Publication statusPublished - Mar 1 2008

Keywords

  • Conventional total knee arthroplasty
  • High-flexion total knee arthroplasty
  • Mechanical behaviour

ASJC Scopus subject areas

  • Mechanical Engineering
  • Medicine(all)
  • Biomedical Engineering

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