Evidence that in vivo wear damage alters kinematics and contact stresses in a total knee replacement

John L. Williams, David A. Knox, Matthew G. Teeter, David W. Holdsworth, William Mihalko

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Polyethylene wear after a total knee arthroplasty is inevitable. The effects of the wear particles on the surrounding soft tissue causing inflammatory responses and eventual aseptic loosening are well documented, but the biomechanical changes from polyethylene wear have been less understood. This study investigated how wear from a retrieved polyethylene insert from a total knee arthroplasty changed the kinematics and contact stresses. A cruciate-retaining total knee implant (Natural-Knee, Intermedics Orthopedics, Inc., Austin, Texas) was retrieved from a donor program. The polyethylene insert was then scanned and modeled. KneeSIM (LifeMOD/KneeSIM, San Clemente, California) was used to simulate one cycle of gait of three second duration (100% of cycle). A threefold increase in contact stress as well as resulting kinematic changes were seen when the model was used to compare the retrieved versus a modeled off-the-shelf new polyethylene insert. Total knee designs should take into account the wear patterns that result from years of use and how they may affect the biomechanics of the knee long term.

Original languageEnglish (US)
Pages (from-to)43-48
Number of pages6
JournalJournal of Long-Term Effects of Medical Implants
Volume20
Issue number1
DOIs
StatePublished - Jan 1 2010

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Knee prostheses
Knee Replacement Arthroplasties
Polyethylene
Biomechanical Phenomena
Polyethylenes
Kinematics
Wear of materials
Knee
Arthroplasty
Biomechanics
Orthopedics
Gait
Tissue

All Science Journal Classification (ASJC) codes

  • Biomedical Engineering
  • Dentistry(all)

Cite this

Evidence that in vivo wear damage alters kinematics and contact stresses in a total knee replacement. / Williams, John L.; Knox, David A.; Teeter, Matthew G.; Holdsworth, David W.; Mihalko, William.

In: Journal of Long-Term Effects of Medical Implants, Vol. 20, No. 1, 01.01.2010, p. 43-48.

Research output: Contribution to journalArticle

Williams, John L. ; Knox, David A. ; Teeter, Matthew G. ; Holdsworth, David W. ; Mihalko, William. / Evidence that in vivo wear damage alters kinematics and contact stresses in a total knee replacement. In: Journal of Long-Term Effects of Medical Implants. 2010 ; Vol. 20, No. 1. pp. 43-48.
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