Initial mechanical stability of cementless porous titanium patellar components

R. Parker Eason, Noah Ledford, Tarisa Lerro, Phillip Cornwell, Philip Rae, R. Ben Willms, R. Michael Meneghini, Arlen Hanssen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


Cementless fixation in total knee replacement has enjoyed limited success in the past; however, there is a renewed interest in cementless fixation, which has the potential to increase operative efficiency and to improve the strength of the bone-implant interface. The initial mechanical stability of cementless implants is critical to minimizing micromotion between the bone and the porous-coated surface, thus providing the necessary conditions for successful osseointegration (long-term bonding between the bone and implant). A critical element to any total knee replacement system is a durable and well-functioning patellar component. The first purpose of this study is to assess whether vibration analysis techniques can be used to evaluate and characterize initial mechanical stability of cementless implants as accurately as the traditional method of micromotion measurement using LVDTs, which have significant experimental limitations. The second purpose is to evaluate and determine the comparative mechanical stability of various designs of cementless patella components under mechanical loading designed to simulate in vivo forces. The various designs included two control groups of cemented patella designs; a "cementless control" of a currently accepted cementless design; a group of newly-developed, cementless, porous titanium designs; and a cementless design with oversized peg holes. The LVDT data showed no statistical difference between the two cemented groups, nor between the press-fit cementless groups, although the cemented groups had less micromotion than the uncemented groups. Vibration analysis techniques were not able to accurately assess mechanical stability.

Original languageEnglish (US)
Title of host publicationIMAC-XXVI
Subtitle of host publicationConference and Exposition on Structural Dynamics - Technologies for Civil Structures
StatePublished - 2008
Event26th Conference and Exposition on Structural Dynamics 2008, IMAC-XXVI - Orlando, FL, United States
Duration: Feb 4 2008Feb 7 2008

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652


Other26th Conference and Exposition on Structural Dynamics 2008, IMAC-XXVI
Country/TerritoryUnited States
CityOrlando, FL

ASJC Scopus subject areas

  • Engineering(all)
  • Computational Mechanics
  • Mechanical Engineering


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