Finite element study of the acetabulum in cemented hip arthroplasty investigating retention or removal of the subchondral bone plate

Research output: Contribution to journalArticle

Abstract

The importance of the subchondral bone plate of the acetabulum when preparing the pelvis for a cemented acetabular cup during total hip arthroplasty (THA) has been investigated using finite element analysis. The effect of retaining or removing the subchondral bone plate and the use of anchoring holes are compared. Loading was applied via both hip joint contact force and the activity of up to 22 muscles at five stages through the load bearing phase of the gait cycle. Removing the subchondral bone plate leads to decreased stresses in the cancellous bone and slightly increased stresses in the cortical shell superior to the acetabulum. The differences between the two cases are small, nevertheless there are indications that removal of the subchondral bone plate reduces the stresses. Increasing the cement penetration depth leads to a slightly more rigid structure, due to cement penetrating the cancellous bone. Adding anchoring holes moves the position of the highest cancellous bone strains from the bone-cement interface into the cancellous bone. Thus removal of the subchondral bone plate should lead to an increased potential for cement penetration into the cancellous bone which should be beneficial for cup fixation and thus improve long term implant survival.

Details

Authors
Organisations
External organisations
  • University of Glasgow
  • Skåne University Hospital
  • Lund University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Orthopedics

Keywords

  • acetabular reconstruction, biomechanics, FEA modeling, hip replacement, subchondral bone plate
Original languageEnglish
Pages (from-to)525-536
Number of pages12
JournalBiomedizinische Technik. Biomedical engineering
Volume61
Issue number5
Publication statusPublished - 2016 Oct 1
Publication categoryResearch
Peer-reviewedYes